Figures below show the clinical photograph and radiograph obtained from a 62-year-old man who hasdeformity and pain 1 year after primary total hip arthroplasty. What is the reason for the observed deformity?

Loosening and subsidence of the femoral stem into retroversion

In the evaluation of somatosensory-evoked potential waveforms for intraoperative neuromonitoring for spinal surgery, the minimum criteria for determining potentially significant changes include Review Topic

50% decrease in amplitude, 10% increase in latency.

A 17-year-old girl with Charcot-Marie-Tooth disease reports the development of progressive instability when walking on uneven surfaces. Her involved heel is positioned in varus when viewed from behind. Examination reveals that she walks on the outer

Dorsiflexion osteotomy of the first metatarsal

A 45-year-old man sustains a low-velocity gunshot wound to the base of the right thumb. The open wound is allowed to heal by secondary intention, resulting in a contracture of the first web space. Clinical photographs are shown in Figures 49a through

a posterior interosseous fasciocutaneous flap.

The injection shown in Figures 1a and 1b would most benefit a patient who reports which of the following symptoms? Review Topic

Dorsal foot pain extending into the great toe

When performing a Weil osteotomy of a lesser metatarsal, the desired angle of the saw cut should be approximately

parallel with the plantar surface of the foot.

Arab Board Orthopedic B Exam Review | Dr Hutaif

Illustration of arab board orthopedic - Dr. Mohammed Hutaif

Arab Board Orthopedic B Review | Dr Hutaif General Orth -...

Comprehensive 100-Question Exam

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Question 1

A 35-year-old male presents following a high-speed motor vehicle collision. He is hemodynamically stable. CT scan reveals a comminuted, unstable Tile C pelvic injury involving a sacral U-type fracture (Denis III) extending into the sacroiliac joint, and a contralateral pubic rami fracture. Neurological examination reveals a partial L5 nerve root palsy on the side of the sacral fracture. What is the most appropriate initial surgical management strategy for the posterior pelvic ring instability?

Explanation

The patient has a comminuted, unstable sacral U-type fracture (Denis III) with an L5 nerve root palsy. U-type sacral fractures are highly unstable and often associated with neurological deficits. While percutaneous iliosacral screws can be used for some sacral fractures, they may not provide adequate stability for U-type fractures, especially with comminution and neurological involvement, which often indicates significant posterior column disruption. Open reduction via a posterior approach can be an option but might not provide sufficient stability for severe U-type fractures and has higher soft tissue morbidity. A transiliac internal fixator (Ganz clamp) is primarily for SI joint disruption or vertical shear injuries but less effective for comminuted sacral body fractures. Lumbopelvic fixation (spinopelvic instrumentation) is the most robust construct for highly unstable sacral fractures, particularly U-type or H-type fractures, especially when associated with neurological deficits, comminution, or when traditional iliosacral screws are deemed insufficient or contraindicated (e.g., due to fracture morphology, high sacral dysmorphism index, or need for reduction of severe displacement). It provides superior biomechanical stability compared to isolated iliosacral screws, allowing for precise reduction and decompression if needed. The anterior external fixator addresses the anterior pelvic ring instability. SI joint fusion is not the primary approach for acute unstable sacral fractures; it's more for chronic pain or degenerative conditions.

Question 2

A 68-year-old male with a history of prostatic adenocarcinoma presents with progressive bilateral lower extremity weakness and new-onset urinary retention over 48 hours. MRI spine shows metastatic lesion at T8 causing severe spinal cord compression. His preoperative ECOG performance status is 2. Biopsy confirmed metastatic prostate cancer. He has a predicted survival of more than 6 months based on his oncology assessment. Which of the following surgical strategies offers the best balance of neurological preservation/recovery and local tumor control in this scenario?

Explanation

The patient has acute neurological deficit (motor weakness, urinary retention) due to spinal cord compression from a metastatic tumor, with a good prognosis (ECOG 2, >6 months survival). Decompressive laminectomy alone is largely considered inadequate for metastatic spine disease as it destabilizes the spine without providing sufficient decompression or tumor control and can lead to kyphosis and progressive instability. Steroids and radiation therapy are crucial but may be too slow for acute, severe neurological deficits, and radiation alone offers less robust local control for high-grade compressions. Posterior decompression and short-segment stabilization (C) might provide some stability but often fails to achieve wide enough decompression or adequate local control for aggressive tumors or those with significant anterior column involvement. Anterior corpectomy (E) addresses the anterior compression but is a separate surgery, and often requires a posterior stabilization in conjunction for optimal stability, and this option states 'alone'. The optimal strategy for a patient with severe spinal cord compression from metastatic cancer with good prognosis is posterior decompression, circumferential tumor resection (vertebral column resection or total en bloc spondylectomy if feasible and indicated), and long-segment instrumentation. This approach, often performed as a single-stage posterior surgery (separating posterior elements, corpectomy via a transpedicular or costotransversectomy approach, followed by reconstruction), offers the most comprehensive decompression, allows for the best chance of obtaining adequate surgical margins (local control), and provides robust immediate stability to prevent further neurological compromise and facilitate early mobilization and adjuvant therapies. Long-segment fixation (extending two levels above and two levels below the affected vertebral body) is generally preferred for metastatic disease to ensure durable stability and prevent construct failure.

Question 3

A 72-year-old male undergoes revision total hip arthroplasty for aseptic loosening of a cemented femoral stem with significant proximal femoral bone loss (Paprosky type IIIB). He has an intact greater trochanter and good abductor function. What is the most appropriate reconstructive option for the femoral side?

Explanation

Paprosky type IIIB femoral bone loss indicates severe loss of metaphyseal and diaphyseal bone, making it challenging to achieve stable fixation with standard stems. A cemented standard femoral stem (A) would not provide adequate fixation in a compromised cement mantle and poor bone stock. An uncemented extensively porous-coated stem (B) relies on diaphyseal press-fit and bone ingrowth, which may be difficult to achieve reliably with severe bone loss, particularly if the diaphysis is not a good canal fit. Femoral head autograft (D) is generally not sufficient for type IIIB loss, which often requires structural support beyond what a simple graft can offer. An Allograft-prosthesis composite (E) is a viable and powerful option for severe bone loss (Type III and IV), often providing structural support and allowing for biological fixation; however, it has risks of infection, non-union, and resorption, and is typically reserved for even more severe cases (Type IV or failed Type IIIB where other options are not feasible). For Paprosky type IIIB, a modular tapered fluted titanium stem (C) is often the preferred choice. These stems achieve distal diaphyseal fixation, bypassing the proximal bone defect, and the modularity allows for restoration of leg length, offset, and version. The tapered, fluted design provides excellent rotational stability and press-fit fixation in the distal diaphysis, making it suitable for cases with significant proximal bone loss but an intact distal femoral canal.

Question 4

A 12-year-old girl with cerebral palsy (GMFCS Level III) presents with a rapidly progressing 75-degree thoracolumbar scoliosis, causing significant trunk imbalance and seating difficulties. She has a high risk of developing respiratory compromise. Her Risser score is 0. What is the most appropriate surgical intervention to address her spinal deformity and functional needs?

Explanation

The patient has a severe, rapidly progressing scoliosis (75 degrees) with significant functional impact (trunk imbalance, seating difficulties, respiratory compromise risk) in the setting of cerebral palsy. Her Risser 0 indicates significant remaining growth potential, but the severity of the curve and the underlying neurological condition make non-operative management (A) or growth-friendly strategies like growing rods (B) less ideal as definitive solutions. Growing rods are typically used for younger patients with significant growth remaining and less severe curves to delay definitive fusion, and a 75-degree curve at 12 with GMFCS III requires more immediate, robust correction. Anterior vertebral body tethering (C) is a growth modulation technique reserved for skeletally immature patients with idiopathic scoliosis, generally curves between 35-50 degrees, and is not suitable for severe neuromuscular scoliosis due to its limitations in correcting large, stiff curves and its dependency on continued growth. Hemivertebra resection (E) is for congenital scoliosis due to a hemivertebra, which is not described here. For a severe, progressive neuromuscular scoliosis in an adolescent with cerebral palsy, posterior spinal fusion with instrumentation, typically extending from the upper thoracic spine to the pelvis (T2 to L5/S1), (D) is the most appropriate definitive surgical intervention. This provides robust correction of the deformity, achieves permanent stability, improves seating balance, and prevents further progression and respiratory compromise. Fusion to the pelvis (L5/S1) is often necessary in neuromuscular scoliosis to prevent pelvic obliquity and ensure stable seating.

Question 5

A 40-year-old carpenter sustains a severe right hand injury from a saw, resulting in complete transection of the ulnar nerve at the wrist, laceration of the flexor digitorum profundus (FDP) tendons to the ring and small fingers, and segmental bone loss of the proximal phalanx of the small finger. All other neurovascular structures are intact. What is the optimal initial surgical management strategy for this complex injury?

Explanation

This is a complex hand injury involving nerve, tendon, and bone. The goal of initial management is to achieve a stable, viable, and potentially functional hand. Debridement is always the first step in open injuries. Tendon repair (FDP) should generally be done primarily, if feasible, to optimize gliding and functional recovery. Bone loss of the proximal phalanx requires stabilization and restoration of length; immediate bone grafting (e.g., autograft) can be performed if soft tissue coverage is adequate and the wound is clean. Nerve repair (ulnar nerve): While traditionally delayed nerve repair was advocated, current evidence generally supports primary nerve repair for sharp, clean lacerations, especially in the context of other repairs, to maximize axon regeneration and functional recovery. There is no benefit to delaying nerve repair for 3-6 weeks unless the wound is contaminated or soft tissue is significantly compromised. Single-stage repair of all structures is often the ideal approach, assuming wound conditions permit. Option C suggests delayed nerve repair, which is less optimal for clean lacerations. Option E (amputation) is overly aggressive given the potential for functional salvage. Therefore, debridement, tendon repair, immediate bone grafting for the phalanx, and primary nerve repair (D) represents the most comprehensive and optimal initial surgical strategy aiming for best functional outcome.

Question 6

A 55-year-old male with long-standing poorly controlled Type 2 diabetes presents with a chronically painful, deformed right foot characterized by a 'rocker-bottom' deformity, prominent plantar ulceration beneath the midfoot, and radiographic evidence of fragmentation, sclerosis, and bony proliferation of the tarsometatarsal joints (Lisfranc region) consistent with Charcot neuroarthropathy. He has failed conservative management including total contact casting. Which surgical intervention is most appropriate at this stage?

Explanation

The patient presents with advanced Charcot neuroarthropathy (rocker-bottom deformity, chronic plantar ulceration, radiographic changes) in the midfoot, refractory to conservative management. Percutaneous plantar fascia release (A) is for plantar fasciitis, not Charcot. Exostectomy of the prominent plantar bone (B) might relieve pressure and heal the ulcer temporarily, but it does not address the underlying instability and progressive deformity, often leading to recurrence of the ulcer or new ulcers. Below-knee amputation (D) is a last resort, usually reserved for unmanageable infection, severe intractable pain, or uncontrollable deformity despite reconstructive efforts, which is not indicated as the most appropriate initial surgical intervention here. Open reduction and internal fixation of individual fragmented bones (E) is generally not feasible or effective in Charcot foot due to severe osteopenia, bone fragmentation, and underlying neuropathy, which compromise fixation and healing. Midfoot arthrodesis with internal fixation (C) is the most appropriate surgical intervention for a stable, plantigrade foot in Charcot neuroarthropathy with rocker-bottom deformity and recurrent ulceration that has failed conservative care. This procedure aims to correct the deformity, stabilize the joints, and create a stable, fusable platform to redistribute plantar pressure and facilitate ulcer healing, thereby preserving the limb.

Question 7

A 28-year-old semi-professional athlete sustains a high-energy knee injury during a football game. Clinical examination reveals gross instability with a positive Lachman, posterior drawer, varus stress test at 0 and 30 degrees, and increased external rotation at 30 degrees, indicative of a combined ACL, PCL, Posterolateral Corner (PLC), and Lateral Collateral Ligament (LCL) injury. He has no neurovascular deficits. What is the most appropriate surgical management strategy regarding timing and technique?

Explanation

This patient has a severe, multiligamentous knee injury (combined ACL, PCL, PLC, LCL). Non-operative management (E) is generally not recommended for such extensive injuries in athletes. Immediate repair (A) within 24-48 hours is largely discouraged due to significant swelling, stiffness, and increased risk of arthrofibrosis. Staged reconstruction (C) might be considered in very specific, complex cases, but generally increases morbidity, cost, and prolongs recovery without clear superiority. Open primary repair of the PLC/LCL followed by delayed ACL/PCL reconstruction (D) could be an option for isolated PLC avulsions or specific repairable tears, but it's not the overall best strategy for all ligaments in a high-energy multiligamentous injury. The current consensus for most multiligamentous knee injuries in athletes, especially high-grade combined injuries, is delayed, single-stage reconstruction of all torn ligaments at 3-6 weeks (B), after the acute inflammatory phase has subsided and soft tissue swelling has decreased. This timing minimizes the risk of arthrofibrosis, allows for better surgical exposure, and optimizes the chances of good postoperative range of motion and functional recovery. Repairable ligaments are typically repaired, while non-repairable ligaments are reconstructed.

Question 8

A 15-year-old boy presents with right distal femoral pain and swelling. Biopsy confirms high-grade osteosarcoma. Staging studies reveal no metastatic disease. He has completed several cycles of neoadjuvant chemotherapy, demonstrating a good response. What is the most crucial principle to ensure local tumor control during subsequent surgical resection?

Explanation

For high-grade osteosarcoma, surgical resection with adequate margins is the cornerstone of local tumor control and significantly impacts patient survival. Achieving a wide surgical margin (>2 cm of healthy tissue circumferentially) (A) is paramount. A wide margin means removal of the tumor along with a cuff of normal surrounding tissue, ensuring that no microscopic tumor cells are left behind. This is the gold standard for oncologic resection of sarcomas. Intralesional resection (B) is contraindicated for high-grade sarcomas due to very high rates of local recurrence. Cryoablation or radiofrequency ablation (C) are adjunctive therapies but not substitutes for achieving a wide surgical margin in curative resections. Administering intraoperative chemotherapy (D) is not a standard or proven method for local tumor control in osteosarcoma. Relying primarily on neoadjuvant chemotherapy to sterilize margins (E) is incorrect; while chemotherapy improves tumor necrosis, it does not eliminate the need for a definitive surgical resection with wide margins.

Question 9

A 60-year-old male with a history of open tibia fracture 5 years ago presents with a draining sinus tract and chronic pain at the fracture site. X-rays show sclerosis, cortical thickening, and a cloaca. MRI confirms chronic osteomyelitis with sequestrum formation. Cultures from the draining sinus have repeatedly grown Pseudomonas aeruginosa. After thorough debridement, what is the most appropriate next step in managing the infection and achieving bone union?

Explanation

The patient has chronic osteomyelitis with a draining sinus, sequestrum, and a difficult-to-treat organism (Pseudomonas aeruginosa). Long-term oral antibiotic therapy alone (A) is insufficient for chronic osteomyelitis with sequestrum. Local antibiotic delivery (B) is a good adjunct but must be accompanied by radical debridement; bone grafting before infection control is resolved will also fail. Amputation (D) is a last resort and not indicated here. Hyperbaric oxygen therapy (E) can be an adjunct but is not a primary treatment. The most appropriate and effective approach for chronic osteomyelitis with sequestrum is radical surgical debridement, which includes removal of all necrotic and infected bone (sequestrum), meticulous debridement of soft tissues, obliteration of dead space, followed by stabilization of the bone defect (often with an external fixator, especially if there's significant bone loss or instability), and a prolonged course of systemic intravenous antibiotics tailored to the cultured organism (C). This comprehensive approach aims to eradicate the infection, promote bone healing, and prevent recurrence.

Question 10

A 45-year-old woman presents with diffuse bone pain, muscle weakness, and multiple stress fractures. Her history includes a remote gastrectomy for peptic ulcer disease and prolonged use of proton pump inhibitors. Lab results show hypocalcemia, hypophosphatemia, elevated alkaline phosphatase, and elevated parathyroid hormone (PTH). Her 25-hydroxyvitamin D level is significantly low. What is the most likely diagnosis and primary treatment target?

Explanation

The patient's clinical presentation (diffuse bone pain, muscle weakness, stress fractures) and lab findings (hypocalcemia, hypophosphatemia, elevated PTH, elevated alkaline phosphatase, low 25-hydroxyvitamin D) are classic for osteomalacia. The history of gastrectomy and prolonged PPI use strongly suggests malabsorption. Primary hyperparathyroidism (A) would typically present with hypercalcemia. Osteoporosis (B) would not typically cause hypophosphatemia or such elevated alkaline phosphatase. Renal osteodystrophy (C) would show kidney dysfunction, and the primary cause here points to the gut. Oncogenic osteomalacia (D) typically presents with isolated hypophosphatemia but normal calcium and PTH. Therefore, the most likely diagnosis is acquired osteomalacia due to malabsorption, and the primary treatment target is to correct the vitamin D deficiency and calcium balance (E). This involves high-dose vitamin D supplementation (often calciferol followed by cholecalciferol) and calcium supplementation to address the malabsorption caused by gastrectomy and PPI use.

Question 11

A 30-year-old male sustains a T12 burst fracture after a fall from height. He has 50% canal compromise and a neurological deficit with grade 3/5 motor strength in both lower extremities (ASIA D). There is no significant kyphosis on initial imaging. What is the most appropriate surgical approach and strategy?

Explanation

The patient has a T12 burst fracture with significant canal compromise and a neurological deficit (ASIA D). Non-operative management (D) is inappropriate. Posterior laminectomy alone (A) is generally contraindicated for burst fractures, especially with neurological deficits, as it can worsen kyphosis and instability without effectively decompressing anteriorly displaced fragments. Anterior corpectomy and reconstruction (B) effectively decompresses the cord and reconstructs the anterior column, but it may not be sufficient for severe posterior element injuries or provide enough stability alone. Immediate anterior and posterior combined approach (E) is very aggressive and reserved for highly unstable or complex deformities. The most appropriate strategy, which allows for robust decompression and stabilization from a single approach, is posterior reduction, decompression via a transpedicular or costotransversectomy approach, and long-segment pedicle screw fixation (T10-L2) (C). This approach allows for indirect and often direct decompression of the spinal canal, provides excellent stabilization, corrects kyphosis, and minimizes morbidity compared to combined approaches. Long-segment fixation (typically two levels above and two below) is generally preferred for burst fractures with neurological deficit to ensure adequate stability and load sharing.

Question 12

A 25-year-old rugby player presents with recurrent anterior shoulder instability. MRI reveals a Bankart lesion, significant glenoid bone loss (>25% of the inferior glenoid width), and a large Hill-Sachs lesion. He continues to experience instability despite rehabilitation and has a high-demand throwing requirement. What is the most appropriate surgical intervention?

Explanation

This patient has recurrent anterior shoulder instability in a high-demand athlete with significant glenoid bone loss (>25%) and a large Hill-Sachs lesion (bipolar bone loss). Arthroscopic Bankart repair with remplissage (A) is suitable for a Bankart lesion with a large Hill-Sachs but without significant glenoid bone loss; with >25% glenoid bone loss, it has a very high failure rate. Open anterior capsular shift (B) addresses capsular laxity but not bone deficiencies. Arthroscopic repair with glenoid bone block augmentation from the iliac crest (D) is viable, but the Latarjet procedure is often preferred for high-demand overhead athletes with significant bone loss due to its dynamic stabilization effect. Rotator interval closure (E) is insufficient for such a complex injury. The Latarjet procedure (C) is the most appropriate surgical intervention in this scenario. It addresses the glenoid bone loss by transferring the coracoid process with its attached conjoined tendon to the anterior-inferior glenoid. This procedure increases the glenoid arc, provides a bony block to anterior translation, and the conjoined tendon acts as a 'sling' (dynamic stabilization) that tightens with abduction and external rotation, preventing anterior dislocation. It is particularly effective in high-demand athletes with significant bone loss and has lower recurrence rates compared to isolated soft tissue repairs.

Question 13

A 78-year-old female sustains a low-energy fall resulting in a Vancouver B2 periprosthetic femoral fracture around a well-fixed, extensively porous-coated uncemented total hip arthroplasty stem. The stem shows no signs of loosening on radiographs and appears stable. What is the most appropriate surgical management?

Explanation

A Vancouver B2 periprosthetic femoral fracture is defined as a fracture around a loose femoral stem. Although the prompt mentions the stem 'shows no signs of loosening on radiographs and appears stable', the classification of B2 takes precedence, indicating the stem is compromised and requires revision. For a Vancouver B2 fracture, the existing loose stem must be revised, and the fracture needs stabilization. ORIF (A) retaining the existing stem is for Vancouver B1 fractures (well-fixed stem). Revision to a long, extensively porous-coated femoral stem (B) could be an option if distal fixation is assured, but may not adequately bypass the fracture. Revision to a cemented stem with cerclage wires (D) is less common as a primary revision strategy for B2 fractures with bone loss. Non-operative management (E) is not for unstable periprosthetic fractures. Therefore, revision to a modular tapered fluted stem, bypassing the fracture site (C) is generally the preferred choice for Vancouver B2 fractures. These stems achieve stable distal fixation in healthy bone beyond the fracture, and their modularity allows for appropriate restoration of limb length, offset, and version, providing a robust solution for a loose stem with associated fracture.

Question 14

A 3-year-old child is diagnosed with congenital pseudarthrosis of the tibia (CPT). Radiographs show a sclerotic, atrophic non-union in the middle third of the tibia. He has a history of multiple casting attempts that have failed. What is the most critical factor influencing the high failure rate and difficult management of CPT?

Explanation

Congenital pseudarthrosis of the tibia (CPT) is one of the most challenging orthopedic conditions. While CPT is often associated with localized abnormal tissue, the most critical underlying factor for its high failure rate and difficult management is its strong association with Neurofibromatosis type 1 (NF1) (B). Approximately 50-90% of CPT cases are associated with NF1. The pathophysiology of CPT in NF1 is thought to involve aberrant osteoclast activation and abnormal mesenchymal tissue surrounding the pseudarthrosis, which inhibits normal bone healing. This underlying biological defect, rather than just poor vascularity (D), makes healing extremely difficult and prone to recurrence. Fibrous dysplasia (A) is not the primary or most critical underlying factor influencing CPT failure rates; NF1 is the major association. Inadequate initial immobilization (C) can contribute to failure, but the inherent biological problem of CPT, particularly with NF1, makes it prone to failure even with excellent immobilization. Parental non-compliance (E) is a general factor but not the most critical factor influencing the high failure rate of CPT itself.

Question 15

A 30-year-old active male presents with chronic ulnar-sided wrist pain, clicking, and weakness for 6 months, following a fall onto an outstretched hand. Clinical examination reveals tenderness over the triquetrum and a positive ulnar snuffbox test. Imaging shows a dynamic scapholunate dissociation and a complete tear of the triangular fibrocartilage complex (TFCC) central and foveal attachments, with positive drive-through test. Which surgical procedure is most likely to provide stable and lasting relief of his symptoms?

Explanation

The patient presents with chronic ulnar-sided wrist pain, clicking, and weakness, along with objective findings of a complete tear of the TFCC central and foveal attachments, a positive drive-through test, and tenderness over the triquetrum. This points to significant ulnar-sided wrist instability. While 'dynamic scapholunate dissociation' is also mentioned, the primary symptoms and the explicit complete TFCC tear are the most direct targets for intervention, especially as there is no specific scapholunate (SL) repair option provided. Arthroscopic TFCC debridement (A) is insufficient for a complete foveal tear. Ulnar shortening osteotomy (C) is for ulnar positive variance or impaction. LT ligament reconstruction (D) is for lunotriquetral instability, which might be a secondary issue, but the TFCC tear is a more primary structural disruption for ulnar-sided stability. Four-corner arthrodesis (E) is a salvage procedure for advanced arthritis. For a complete tear of the TFCC foveal attachment, which is critical for distal radioulnar joint and ulnar carpal stability, open repair of the TFCC foveal attachment (B) is the most appropriate procedure to restore stability and provide lasting relief from ulnar-sided wrist pain and mechanical symptoms. This directly addresses the main structural lesion causing instability on the ulnar side.

Question 16

A 35-year-old active female presents with chronic groin pain, positive FADIR and FABER tests, and radiographic evidence of a pincer-type femoroacetabular impingement (FAI) with focal labral ossification and early chondral delamination along the acetabular rim. She has failed non-operative management. What is the most appropriate surgical approach for durable symptomatic relief?

Explanation

The patient has pincer-type FAI with labral ossification and early chondral delamination, failing conservative treatment. This requires surgical intervention. Arthroscopic labral debridement and acetabular rim trimming (A) might relieve symptoms, but labral repair is generally preferred over debridement, especially with focal ossification indicating chronic pathology. Open surgical dislocation (B) is a robust approach but more invasive with higher morbidity, usually reserved for complex deformities or failed arthroscopic cases. Periacetabular osteotomy (D) is for acetabular dysplasia, not FAI. Hip arthrodesis (E) is a salvage procedure for severe arthritis. For pincer FAI with labral pathology, the goal is to resect the over-covered acetabular rim (rim trimming), and repair or reconstruct the labrum. While the question explicitly states 'pincer-type FAI', many patients have mixed FAI components, thus addressing femoral-sided impingement with femoral osteoplasty is often prudent for a comprehensive treatment. Arthroscopic labral repair, acetabular rim trimming, and femoral osteoplasty (C) is the most appropriate and common contemporary surgical approach. It offers the advantages of minimally invasive surgery while allowing for comprehensive treatment of the pathology: addressing the pincer lesion (rim trimming), dealing with the labral injury (repair is preferred for durability), and correcting any subtle cam component on the femoral side if also contributing to impingement, leading to durable symptomatic relief.

Question 17

A 32-year-old professional football player presents with persistent knee pain, swelling, and mechanical symptoms 5 years after a total lateral meniscectomy following a complex tear. Radiographs show early degenerative changes in the lateral compartment, but no significant bone-on-bone arthritis. MRI confirms complete absence of the lateral meniscus. He has failed conservative management and desires to prolong his athletic career. What is the most appropriate surgical recommendation?

Explanation

The patient is a young, active professional athlete with a history of total meniscectomy, experiencing pain and early degenerative changes without advanced arthritis (no bone-on-bone). He wishes to prolong his career. High tibial osteotomy (A) is typically for unicompartmental osteoarthritis with varus malalignment, aiming to offload the medial compartment, which is not the primary issue here. Lateral unicondylar knee arthroplasty (B) and Total knee arthroplasty (C) are for more advanced, symptomatic arthritis and would end his professional athletic career. Arthroscopic debridement (E) is palliative and unlikely to provide lasting relief. Allograft meniscal transplantation (D) is the most appropriate option. It is indicated in young, active patients with symptomatic meniscal deficiency (prior total meniscectomy), intact articular cartilage (or only early changes), stable ligaments, and proper limb alignment. The goal is to restore the meniscal function (load transmission, shock absorption, joint stability), reduce pain, and potentially delay the progression of osteoarthritis, thereby allowing the patient to continue high-level activities.

Question 18

A 45-year-old male sustains a high-energy pilon fracture (distal tibia intra-articular fracture) with significant soft tissue swelling, blistering, and an open wound classified as Gustilo-Anderson Type I. Initial management includes meticulous wound debridement, provisional external fixation spanning the ankle, and intravenous antibiotics. On day 3, the soft tissue envelope appears less edematous, and the blisters are resolving, but the open wound requires further closure. What is the most appropriate next step in definitive management?

Explanation

This patient has a high-energy pilon fracture, compounded by significant soft tissue injury (blistering, Gustilo Type I open wound). The initial management (debridement, external fixation, antibiotics) is correct. The improving soft tissue conditions on day 3, with the open wound still requiring closure, indicates a need for careful timing. Immediate ORIF (A) is generally contraindicated in pilon fractures with severe soft tissue compromise due to high risks of wound breakdown and infection. Delayed ORIF at 10-14 days (B) is common for closed pilon fractures, but for an open fracture with significant articular comminution, a staged approach is safer. Medial malleolar osteotomy (C) is an adjunct, not the main strategy. Below-knee amputation (E) is a last resort. The most appropriate strategy is a staged approach (D). This typically involves an initial stage (already performed) of debridement and external fixation. The next step, often within 3-7 days when soft tissues improve, is a limited internal fixation of the articular fragments only (to restore the joint surface) followed by wound closure. Definitive plating of the metaphysis is then performed after 2-3 weeks, once the soft tissue envelope has fully recovered. This sequential approach minimizes soft tissue complications and optimizes the chances of a good outcome.

Question 19

Which of the following statements regarding the biological response and mechanical properties of orthopedic implants is most accurate?

Explanation

A. Cobalt-chromium alloys are chosen primarily for their high strength, hardness, and corrosion resistance, not for osseointegration (which is a property of titanium). B. UHMWPE wear particles are a major cause of aseptic loosening in arthroplasty. These particles elicit an inflammatory response in periprosthetic tissues, leading to a cascade of events that includes osteoclast activation and subsequent periprosthetic osteolysis, causing the implant to loosen. C. Titanium alloys have a lower Young's modulus (closer to bone) compared to stainless steel, making them more flexible and less prone to stress shielding. D. Bone cement (PMMA) functions as a mechanical interlock, providing immediate fixation by filling spaces; it does not promote biological bone ingrowth. E. Hydroxyapatite (HA) coatings promote osseointegration by providing a bioactive surface that encourages bone apposition and ingrowth for biological fixation. They do not primarily increase the coefficient of friction for immediate mechanical stability.

Question 20

A 65-year-old female with long-standing, severe rheumatoid arthritis (RA) presents with progressive spastic quadriparesis, hyperreflexia, and gait disturbance. MRI of the cervical spine reveals significant atlantoaxial instability (AAI) with a posterior atlanto-dental interval (PADI) of 10 mm and C1-C2 subluxation causing spinal cord compression. She has diffuse osteopenia and multiple comorbidities related to her RA. What is the most appropriate surgical management strategy?

Explanation

The patient has symptomatic atlantoaxial instability (AAI) with spinal cord compression (spastic quadriparesis, hyperreflexia, gait disturbance) in the setting of severe rheumatoid arthritis. Non-operative management (D) is contraindicated due to progressive neurological deficits. Anterior cervical decompression and fusion (A) is generally not indicated for C1-C2 instability. Posterior decompression (laminectomy of C1) and occipitocervical fusion (B) is a robust option, especially for irreducible AAI or basilar invagination, but it sacrifices C0-C1 motion. Transoral odontoidectomy alone (E) provides decompression but no stability and typically requires a posterior fusion. The most appropriate and often preferred surgical management for symptomatic reducible atlantoaxial instability in RA is posterior atlantoaxial fusion (C1-C2) using C1 lateral mass and C2 pedicle screws (C). This technique provides rigid fixation and stability at the C1-C2 segment, preserves motion at C0-C1 (occiput-C1), and effectively decompresses the spinal cord by reducing the subluxation. Although osteopenia in RA can make screw fixation challenging, modern techniques usually allow for successful instrumentation. If subluxation is irreducible or there's severe bone loss/basilar invagination, occipitocervical fusion might be considered, but C1-C2 fusion is preferred for isolated, reducible AAI.

Question 21

A 45-year-old male presents with severe pelvic pain and instability after a high-energy motor vehicle collision. Imaging reveals a bilateral sacroiliac joint disruption and a pubic symphysis diastasis of 4 cm. Neurological examination is intact. What is the most appropriate initial surgical management strategy?

Explanation

This patient presents with a severe pelvic ring injury involving both anterior (pubic symphysis diastasis) and posterior (bilateral SI joint disruption) elements, indicating a vertically unstable pattern. Such injuries require robust stabilization of both the anterior and posterior pelvic rings. Anterior plating of the pubic symphysis addresses the anterior instability, while bilateral posterior sacral/iliac fixation (e.g., iliosacral screws or posterior plating) is crucial for stabilizing the posterior ring and preventing persistent vertical instability. Options A, B, C, and E represent incomplete or inadequate stabilization for this type of severe, unstable pelvic injury.

Question 22

A 35-year-old male sustains a T12 burst fracture after a fall, resulting in an incomplete neurological deficit (ASIA D). Imaging shows significant canal compromise (>50%) and 30 degrees of kyphosis. The TLICS score is calculated as 8. What is the most appropriate surgical management for this patient?

Explanation

The patient has an unstable thoracolumbar burst fracture (morphology 3 points) with neurological involvement (incomplete, 3 points) and disruption of the posterior ligamentous complex (PLC is likely disrupted with 30 degrees kyphosis, 2 points). This gives a TLICS score of 3+3+2 = 8. A TLICS score of >=5 indicates a strong recommendation for surgical management. Given the significant canal compromise, kyphosis, and incomplete neurological deficit, posterior decompression (indirect via ligamentotaxis or direct via laminectomy) and fusion with long-segment instrumentation (T10-L2) is the most appropriate approach to restore stability, indirectly decompress the canal, and prevent further neurological deterioration. Anterior decompression is an option but often combined with posterior fusion or used for specific anterior column reconstruction, and less common as a standalone initial approach for burst fractures with posterior instability. Vertebroplasty is for pain relief in stable compression fractures, not unstable burst fractures with neurological deficit. Short-segment posterior instrumentation without decompression may not be sufficient for significant canal compromise and neurological deficit.

Question 23

A 68-year-old female presents with recurrent dislocations of her right total hip arthroplasty (THA) within 6 months of an uneventful primary surgery. Radiographs show a well-fixed femoral stem and acetabular cup with acceptable inclination (40 degrees) and anteversion (20 degrees). The patient has no history of neurological disorders or cognitive impairment. What is the most likely cause and appropriate next step in management?

Explanation

Given that the radiographs show acceptable component position (inclination 40 deg, anteversion 20 deg are within the safe zone of Lewinnek), the recurrent dislocations are less likely due to malposition. In such cases, soft tissue imbalance or insufficiency (e.g., insufficient tension, incompetent capsule/repair, muscle weakness/denervation) is a more likely cause. Surgical exploration allows for assessment of soft tissue integrity, identification of impingement, and potential for soft tissue repair, revision of head-neck length or use of constrained liners. Aspiration for infection should always be considered for any complication but recurrent dislocation with well-positioned components and no signs of infection usually points to mechanical/soft tissue issues first. Options A, D, and E are less likely or incomplete based on the provided information. Impacting trochanteric osteotomy is not a standard treatment for recurrent dislocations and usually indicated for abductor deficiency or reconstruction.

Question 24

A 72-year-old male, 3 months post-total knee arthroplasty (TKA), presents with acute inability to extend his knee and a palpable defect superior to the patella. Radiographs are normal. What is the most likely diagnosis and appropriate management?

Explanation

The clinical presentation of acute inability to extend the knee, a palpable defect superior to the patella, and normal radiographs in a post-TKA patient is pathognomonic for a quadriceps tendon rupture. This is an orthopedic emergency requiring surgical repair. Patellar fracture would be visible on radiographs. Periprosthetic infection is unlikely given the acute mechanical presentation and normal radiographs. Extensor lag due to weakness would not typically present with an acute palpable defect and complete inability to extend. Patellar component loosening would also likely show radiographic changes and usually present with pain or chronic instability rather than acute rupture.

Question 25

A 55-year-old active male presents with chronic glenohumeral instability despite prior arthroscopic capsulolabral repair. Imaging reveals a significant anterior glenoid bone loss (>25%) and a large engaging Hill-Sachs lesion. Which surgical procedure is most indicated for definitive stabilization?

Explanation

For recurrent glenohumeral instability with significant anterior glenoid bone loss (>20-25%) and an engaging Hill-Sachs lesion, a Latarjet procedure (coracoid transfer) is generally considered the most reliable option. It addresses both glenoid bone loss and the engaging Hill-Sachs lesion through the 'sling effect' of the conjoined tendon and dynamic stabilization. Revision arthroscopic repair or Bankart repair with remplissage may be insufficient in the presence of substantial bone loss. Superior capsular reconstruction is typically for irreparable rotator cuff tears. Arthroscopic glenoid augmentation with allograft is an option but often considered in less severe bone loss or specific scenarios, and Latarjet is the gold standard for combined bone loss and engaging Hill-Sachs in an active patient.

Question 26

A 40-year-old male sustains a comminuted fracture of the coronoid process as part of a terrible triad injury of the elbow (radial head fracture, coronoid fracture, posterolateral dislocation). The coronoid fragment involves >50% of the coronoid height. What is the most appropriate management of the coronoid fracture in this setting?

Explanation

In a terrible triad injury, stability is key. Large coronoid fractures (>50% height or Regan and Morrey Type II/III) are critical for elbow stability, especially preventing recurrent posterior dislocation. Excision is contraindicated as it further destabilizes the elbow. Therefore, fixation of the coronoid fragment (e.g., suture lasso, screw fixation, or plate fixation depending on fragment size and configuration) is essential to restore anterior stability. Non-operative management or radial head replacement alone would not address the critical coronoid fracture. A hinge external fixator may be used as an adjunct but does not replace the need to fix the coronoid itself for primary stability.

Question 27

A 30-year-old construction worker presents with chronic wrist pain and weakness 1 year after a fall on an outstretched hand. Radiographs reveal a scaphoid nonunion with features of AVN (sclerosis of the proximal pole) and a significant humpback deformity (Minderhoud's angle < 30 degrees). What is the most appropriate surgical intervention?

Explanation

This patient has a chronic scaphoid nonunion with AVN of the proximal pole and a humpback deformity, indicating a high risk of continued nonunion and carpal collapse (SNAC wrist). In such cases, a vascularized bone graft is crucial to reintroduce blood supply to the avascular proximal pole and promote healing, combined with internal fixation to maintain reduction and compression. Dorsal screw fixation alone is insufficient if AVN is present. Excision of the proximal pole or proximal row carpectomy are salvage procedures for established SNAC wrist. Scaphoid replacement arthroplasty is also a salvage option, generally for older patients or failed reconstructions. Vascularized bone graft provides the best chance for healing and restoration of anatomy in this scenario.

Question 28

A 10-year-old child presents with progressive kyphosis of the thoracic spine, diagnosed as Scheuermann's disease, with a Cobb angle of 80 degrees. The patient has persistent back pain unresponsive to bracing and physical therapy. What is the recommended treatment?

Explanation

Scheuermann's kyphosis with a Cobb angle exceeding 70-75 degrees (some say >70, others >75-80), particularly with persistent pain refractory to conservative management (bracing, PT), is an indication for surgical correction. Surgical treatment typically involves posterior spinal fusion and instrumentation to correct the deformity and stabilize the spine. Bracing is generally effective for curves between 45-75 degrees in growing children, but not for severe, progressive, or symptomatic curves >80 degrees. Vertebroplasty is for vertebral compression fractures, not structural kyphosis. Anterior osteotomy alone is insufficient and destabilizing. Physical therapy alone is not adequate for severe structural kyphosis.

Question 29

A 25-year-old male presents with a persistent painful lump on his left distal femur for 6 months, accompanied by intermittent fever and weight loss. Radiographs show a lytic lesion with an 'onion skin' periosteal reaction and soft tissue mass. Biopsy confirms Ewing's sarcoma. What is the most appropriate initial management approach?

Explanation

Ewing's sarcoma is a highly aggressive malignant bone tumor that commonly metastasizes early. It is highly sensitive to chemotherapy and radiation. The standard of care involves initial neoadjuvant chemotherapy to treat micrometastases and shrink the primary tumor, followed by definitive local control (surgical resection and/or radiation therapy), and then adjuvant chemotherapy. Wide surgical resection alone is often insufficient due to early metastasis. Radiation therapy alone may be used for local control but not as initial monotherapy. Amputation is a salvage procedure, not typically initial management. Observation is contraindicated. Therefore, chemotherapy followed by local control is the gold standard.

Question 30

A 50-year-old diabetic male develops chronic osteomyelitis in his right tibia following an open fracture 2 years ago. He has a persistent draining sinus tract and imaging shows a large segmental bone defect (6 cm) with surrounding sclerotic bone and sequestrum. What is the most appropriate surgical treatment?

Explanation

For chronic osteomyelitis with a large segmental bone defect, draining sinus tract, sequestrum, and extensive infection, aggressive surgical debridement including segmental resection of all infected and non-viable bone is essential. This creates a significant bone defect that must be addressed for limb salvage. Bone transport using an Ilizarov frame (or other external fixator) is a well-established technique for reconstructing large segmental bone defects after infection eradication, allowing for new bone formation and limb lengthening. Debridement with antibiotic suppression or local beads alone is often insufficient for large defects and chronic infection with sequestrum. Amputation is a last resort. Open wound care is supportive but not curative for this extensive infection.

Question 31

A 58-year-old female presents with recurrent right foot and ankle pain, progressively worsening over 5 years. She has a history of type 2 diabetes with peripheral neuropathy. Clinical examination reveals a fixed, rigid planovalgus deformity with a 'rocker-bottom' foot, severe midfoot collapse, and significant hindfoot abduction. Radiographs show extensive disorganization of the midfoot joints, fragmentation, and new bone formation. This presentation is most consistent with what stage of Charcot arthropathy and what is the primary surgical goal?

Explanation

The clinical and radiographic findings of a fixed, rigid rocker-bottom foot with severe midfoot collapse and extensive joint disorganization, fragmentation, and new bone formation are characteristic of Eichenholtz Stage 3 (Reconstruction/Consolidation) Charcot arthropathy. At this stage, the primary surgical goal is to correct the severe deformity and achieve stable bony union, which often requires complex reconstructive procedures such as osteotomy, arthrodesis, and robust internal fixation. Stage 0 is preclinical. Stage 1 is acute, characterized by inflammation and joint effusion, requiring immobilization. Stage 2 is coalescence, where fragments begin to heal, still primarily requiring offloading. Stage 4 is not a standard Eichenholtz stage but refers to reactivation of disease, requiring re-evaluation. While offloading is always important for Charcot, the fixed deformity and chronic nature points to Stage 3 and the need for stabilization.

Question 32

A 65-year-old male with long-standing rheumatoid arthritis presents with progressive weakness in his upper and lower extremities, hyperreflexia, and gait disturbance. Neurological examination reveals spasticity and a positive Babinski sign. What is the most likely diagnosis and crucial diagnostic investigation?

Explanation

The neurological symptoms of progressive weakness, hyperreflexia, spasticity, and gait disturbance, especially in a patient with rheumatoid arthritis, are highly suggestive of cervical myelopathy. Atlantoaxial subluxation is a common and severe complication of rheumatoid arthritis, leading to spinal cord compression. MRI of the cervical spine is the crucial diagnostic investigation to visualize the spinal cord, degree of compression, and the extent of instability at the craniocervical junction. Peripheral neuropathy, carpal tunnel syndrome, and rheumatoid vasculitis would not typically present with myelopathic signs like spasticity and hyperreflexia. Anterior cord syndrome is a specific vascular event, and less likely the primary diagnosis in this chronic presentation.

Question 33

A 40-year-old male presents with chronic posterolateral knee pain, giving way, and hyperextension recurvatum after a multi-ligamentous knee injury 6 months ago. Physical examination reveals increased external rotation recurvatum and a positive reverse pivot shift test. Stress radiographs confirm increased posterolateral tibial translation. Which surgical procedure is most indicated?

Explanation

The clinical presentation of posterolateral knee pain, giving way, hyperextension recurvatum, increased external rotation recurvatum, and a positive reverse pivot shift test are highly indicative of posterolateral corner (PLC) instability. Stress radiographs confirming increased posterolateral tibial translation further support this. Isolated ACL or PCL reconstruction would not address the PLC deficiency. While other ligaments (ACL/PCL) may also be injured in a multi-ligamentous knee injury, the specific signs point strongly to the PLC. Reconstruction of the posterolateral corner is crucial for knee stability in such cases, often combined with ACL/PCL reconstruction if those are also torn, as failure to address the PLC leads to high failure rates of other ligament reconstructions. High tibial osteotomy is for varus malalignment, not primary instability.

Question 34

A 30-year-old male presents with chronic exertional pain and tightness in his anterior compartment of the lower leg, which consistently develops after 15 minutes of running and resolves with rest. Physical examination is unremarkable at rest. What is the most accurate diagnostic test?

Explanation

The clinical picture of exertional leg pain that consistently develops with activity and resolves with rest is classic for chronic exertional compartment syndrome (CECS). The most accurate and definitive diagnostic test for CECS is direct intracompartmental pressure measurement, performed before, immediately after, and at specified intervals (e.g., 1 and 5 minutes) after exercise. Elevated pressures confirm the diagnosis. MRI may show muscle edema but is not definitive. Plain radiographs are normal. Nerve conduction studies are for nerve entrapment, and arteriography for vascular insufficiency, which are differential diagnoses but not the primary cause of CECS.

Question 35

A 40-year-old male with a history of chronic alcohol abuse and corticosteroid use for inflammatory bowel disease presents with persistent left hip pain for 3 months. Radiographs show a crescent sign and early flattening of the femoral head, but no significant joint space narrowing. What is the most appropriate non-arthroplasty surgical management for this patient?

Explanation

The patient's presentation with hip pain, risk factors (alcohol, corticosteroids), a crescent sign, and early flattening of the femoral head indicates osteonecrosis of the femoral head (ONFH) in a pre-collapse or early collapse stage (e.g., Ficat stage II or early III). In this stage, the goal is to prevent further collapse and preserve the native joint. Core decompression with bone grafting (autograft or allograft, often enriched with growth factors or stem cells) is the most appropriate non-arthroplasty surgical management. It aims to reduce intramedullary pressure, improve vascularity, and provide structural support. THA, hemiarthroplasty, and resurfacing arthroplasty are end-stage treatments after significant collapse. Intertrochanteric osteotomy may be considered in specific cases but core decompression is more common for pre-collapse ONFH.

Question 36

A 7-year-old child presents with a severe congenital scoliosis with a 65-degree thoracolumbar curve and an unsegmented bar with contralateral hemivertebrae. The deformity has shown progression on serial radiographs. What is the most appropriate surgical strategy?

Explanation

Congenital scoliosis with an unsegmented bar and contralateral hemivertebrae represents a highly progressive and rigid deformity due to the continuous growth on one side and absent growth on the other. For severe, progressive curves like 65 degrees in a 7-year-old, surgical intervention is indicated. Hemivertebrectomy with posterior fusion and instrumentation is the definitive treatment to remove the progressive element and achieve maximal correction and fusion. Bracing is generally ineffective for congenital scoliosis. Growing rods are used for flexible, progressive curves in young children to delay fusion but may not provide definitive correction for rigid congenital deformities with unsegmented bars. VBT is for idiopathic scoliosis, not congenital. Posterior instrumentation without resection would not adequately correct or stop the progression from the unsegmented bar.

Question 37

A 60-year-old male with a history of Type 2 diabetes and chronic renal failure develops left foot pain and swelling. Radiographs show significant bone resorption in the forefoot, with a 'pencil-in-cup' deformity of the MTP joints. Blood tests reveal elevated parathyroid hormone levels and normal calcium. What is the most likely diagnosis?

Explanation

The combination of chronic renal failure, elevated parathyroid hormone, and specific radiographic findings of bone resorption (e.g., 'pencil-in-cup' deformity, subperiosteal resorption in phalanges, tuft resorption), particularly in the forefoot, is highly suggestive of secondary hyperparathyroidism with osteitis fibrosa cystica. While diabetic osteoarthropathy (Charcot foot) can cause foot deformity, the 'pencil-in-cup' and elevated PTH point specifically to hyperparathyroidism. Gout and rheumatoid arthritis have different radiographic features and underlying pathophysiology. Psoriatic arthritis can have 'pencil-in-cup' but PTH is not typically elevated. Therefore, secondary hyperparathyroidism is the most fitting diagnosis.

Question 38

A 30-year-old male presents with progressive right elbow pain, numbness and tingling in the ring and small fingers, and weakness of intrinsic hand muscles. Clinical examination reveals a positive Tinel's sign at the cubital tunnel, severe ulnar nerve subluxation with elbow flexion, and significant intrinsic muscle wasting. What is the most appropriate surgical management?

Explanation

For severe cubital tunnel syndrome with chronic symptoms, intrinsic muscle wasting, and particularly, gross ulnar nerve subluxation, in situ decompression alone is often insufficient and may lead to recurrent symptoms. Anterior submuscular ulnar nerve transposition is generally preferred in cases of severe compression, prior failed surgery, or significant instability/subluxation of the nerve, as it provides a more robust and stable environment for the nerve and is thought to offer better protection. Medial epicondylectomy can also decompress but does not address subluxation. Anterior subcutaneous transposition may be simpler but offers less protection and stability than submuscular for severe cases. Posterior transposition is not a standard approach.

Question 39

A 68-year-old female presents with severe, progressive adult acquired flatfoot deformity (AAFD) of her left foot. Clinical examination reveals a rigid hindfoot valgus, abduction of the forefoot, and inability to perform a single-limb heel rise. Radiographs confirm severe talonavicular collapse and midfoot break. This presentation corresponds to what stage of Johnson & Strom classification, and what is the generally accepted surgical management?

Explanation

The description of rigid hindfoot valgus, forefoot abduction, inability to perform a single-limb heel rise (indicating posterior tibial tendon dysfunction), and talonavicular collapse with midfoot break in an elderly patient is consistent with Stage III AAFD (flexible deformity with fixed hindfoot valgus, severe forefoot abduction, and rigid changes in the talonavicular joint). For Stage III AAFD, the deformity is rigid, and reconstructive procedures like tendon transfers and osteotomies alone are often insufficient. Triple arthrodesis (fusion of the talonavicular, subtalar, and calcaneocuboid joints) is the generally accepted surgical management to correct the deformity and provide stable fusion, allowing the patient to bear weight on a corrected, stable foot. Stage I and II are flexible, managed with more conservative or joint-preserving surgeries. Stage IV involves ankle involvement. Lateral column lengthening is usually part of a Stage II reconstruction.

Question 40

A 45-year-old female sustains a pilon fracture (distal tibial plafond fracture) with severe comminution and significant soft tissue swelling after a fall from height. There is no open wound. Initial management includes external fixation for temporary stabilization. After 10 days, the soft tissue swelling has significantly decreased, and skin wrinkling is noted. What is the most appropriate next step in surgical management?

Explanation

Pilon fractures, especially high-energy comminuted ones, are associated with severe soft tissue injury. The 'staged approach' is critical for optimizing outcomes. Initial management involves temporary stabilization, often with spanning external fixation, to protect the soft tissues, allow swelling to subside, and minimize further damage. Once the soft tissues have 'declared themselves' (soft tissue envelope is ready, typically indicated by decreased swelling, skin wrinkling, and absence of blistering, usually 7-14 days post-injury), definitive ORIF is indicated. Delaying definitive fixation beyond this 'window of opportunity' or relying solely on external fixation for these complex fractures often leads to poorer outcomes (malunion, stiffness, nonunion). Therefore, immediate definitive ORIF (often using a combined anterior/posterior or medial/lateral approach depending on fracture pattern) is the next most appropriate step. Limited ORIF or percutaneous fixation might not be sufficient for severe comminution. Continued external fixation for 6-8 weeks would likely result in poor articular reduction and prolonged immobilization issues.

Question 41

A 45-year-old male sustains a posterior column and posterior wall acetabular fracture in a motor vehicle accident. CT scan confirms significant displacement and a large posterior wall fragment. The ideal surgical approach for this specific fracture pattern, considering the need for direct visualization and reduction, is typically:

Explanation

The Kocher-Langenbeck approach provides excellent exposure to the posterior column and posterior wall of the acetabulum, making it the workhorse approach for fractures involving these components. The ilioinguinal and modified Stoppa approaches are anterior approaches used for anterior column, anterior wall, or transverse fractures. The extended iliofemoral approach is a more extensive approach for complex bicompartmental fractures but carries higher morbidity. A trochanteric flip osteotomy is typically used for surgical hip dislocation for femoral head or central acetabular pathology, not primarily for posterior column/wall fractures.

Question 42

A 68-year-old female presents with severe debilitating low back pain, radiating into both legs, worse with standing. She has a progressive adult degenerative scoliosis with a coronal Cobb angle of 35 degrees and a sagittal vertical axis (SVA) of +8 cm. She has failed extensive conservative management. Surgical planning for this patient should primarily address:

Explanation

In adult degenerative scoliosis, especially with a significant positive sagittal vertical axis (SVA > 5 cm), sagittal imbalance is a major contributor to pain and disability. The primary goal of surgical intervention is to restore sagittal balance and decompress neural elements. This typically requires long-segment fusion to achieve stable correction and often involves osteotomies to restore lumbar lordosis. Isolated decompression addresses symptoms but not the underlying instability or deformity. Short-segment fusion may lead to junctional kyphosis or continued imbalance. Anterior column support alone is insufficient without posterior fixation. Posterior column osteotomy alone may not provide adequate correction for substantial sagittal imbalance.

Question 43

A 72-year-old male with a history of a left total hip arthroplasty 5 years ago presents with increasing hip pain, fever, and erythema around the incision. Aspiration reveals cloudy fluid. According to the Musculoskeletal Infection Society (MSIS) 2018 criteria, which of the following is considered a major criterion for periprosthetic joint infection (PJI)?

Explanation

The MSIS 2018 criteria for PJI define the presence of a sinus tract communicating with the prosthesis as a major criterion, which alone is diagnostic for PJI. Other major criteria include: (1) two positive cultures of the same organism or (2) a combination of elevated synovial fluid white blood cell count (WBC), elevated synovial fluid polymorphonuclear neutrophil percentage (PMN%), and positive culture (or positive alpha-defensin). Elevated CRP (>10 mg/L) and ESR (>30 mm/hr) are minor criteria. A single positive culture of a virulent organism can contribute to diagnosis but is not a standalone major criterion. Synovial fluid leukocyte count > 3,000 cells/µL is part of the minor criteria and must be combined with PMN% to be considered for diagnosis.

Question 44

A 14-year-old obese male presents with sudden onset of severe right hip pain and inability to bear weight. X-rays show a severe slipped capital femoral epiphysis (SCFE) with >60 degrees posterior slip. Which of the following is the most appropriate initial management strategy?

Explanation

For severe unstable SCFE (often defined as >60 degrees slip or inability to bear weight), forceful closed reduction is contraindicated due to a high risk of avascular necrosis (AVN) of the femoral head and chondrolysis. Open reduction, typically via a surgical dislocation approach, allows for controlled reduction of the epiphysis under direct visualization while preserving the vascular supply, followed by stable fixation with pins. Percutaneous in situ pinning without reduction is for stable SCFE. Gentle closed reduction might be considered for less severe unstable slips, but >60 degrees indicates a high risk. Spica casting and traction are not definitive treatments for SCFE.

Question 45

A 17-year-old male is diagnosed with high-grade osteosarcoma of the distal femur following biopsy. Staging studies reveal no evidence of metastatic disease. According to standard osteosarcoma management protocols, which of the following is the most appropriate next step after diagnosis and before definitive surgery?

Explanation

For high-grade osteosarcoma, even in localized disease without evidence of metastases, neo-adjuvant (preoperative) chemotherapy is a standard of care. It aims to reduce tumor burden, treat micrometastatic disease, and assess tumor response to chemotherapy, which guides postoperative management. Immediate wide en bloc resection without neo-adjuvant chemotherapy is not the standard. Adjuvant radiotherapy is generally reserved for positive surgical margins or unresectable disease. Amputation is a definitive surgery that may be considered after neo-adjuvant chemotherapy if limb salvage is not feasible. Observation is never appropriate for high-grade osteosarcoma.

Question 46

A 30-year-old male sustains a traumatic complete brachial plexus avulsion injury (C5-T1) on the left side due to a motorcycle accident. Clinically, he has a flail arm with no motor or sensory function. Electromyography (EMG) at 3 weeks post-injury confirms complete avulsion. What is the optimal timing for surgical exploration and potential reconstruction (e.g., nerve transfers)?

Explanation

For complete traumatic brachial plexus avulsion injuries in adults, early surgical exploration and reconstruction (e.g., nerve transfers, nerve grafting) should ideally be performed within 3 to 6 months of the injury. This timeframe is critical because waiting longer significantly reduces the potential for reinnervation and functional recovery of target muscles due to irreversible atrophy and fibrosis. Exploration within 24-48 hours is typically for vascular compromise or open injuries. Waiting beyond 6 months dramatically decreases the success rate of nerve reconstruction.

Question 47

A 55-year-old diabetic male presents with an acutely swollen, red, warm, and painful left foot, but denies any recent trauma. Radiographs show early fragmentation and disorganization of the midfoot joints. He has peripheral neuropathy. Which of the following is the most critical initial management step for this suspected Charcot neuroarthropathy?

Explanation

The most critical initial management for acute Charcot neuroarthropathy is strict offloading and immobilization of the affected limb to protect the fragile and unstable joints from further destruction. This is most effectively achieved with a total contact cast (TCC) or a controlled ankle motion (CAM) walker, ensuring complete non-weight bearing. Surgical fusion is typically reserved for later stages after the acute inflammatory phase has subsided and a stable deformity needs correction. Antibiotics are only indicated if a superimposed infection is present. Corticosteroid injections are contraindicated. Amputation is a salvage procedure for severe, uncontrollable deformity or infection.

Question 48

A 28-year-old professional athlete sustains a knee dislocation (KD-IIIL, involving ACL, PCL, and medial-sided structures). Neurological and vascular exams are intact. What is the recommended surgical strategy for such a complex multi-ligament knee injury?

Explanation

For multi-ligament knee injuries, particularly in high-demand patients like professional athletes, acute single-stage reconstruction of all torn ligaments is often the preferred strategy. This approach aims to restore global knee stability early, which is crucial for optimal outcomes and facilitates a more predictable rehabilitation process. Staged reconstruction can lead to prolonged instability and increase the risk of arthrofibrosis. Acute repair alone is rarely sufficient for severe ligamentous tears. Initial immobilization followed by observation is inadequate for severe instability. Arthroscopic débridement and observation are not appropriate for significant ligamentous ruptures.

Question 49

A 65-year-old patient with a history of a total knee arthroplasty 2 years prior is diagnosed with chronic periprosthetic joint infection (PJI) caused by Methicillin-resistant Staphylococcus aureus (MRSA). The patient is otherwise healthy. What is the most widely accepted and effective surgical treatment strategy for chronic MRSA PJI?

Explanation

For chronic periprosthetic joint infection (PJI), especially when caused by virulent organisms like MRSA, a two-stage revision arthroplasty is considered the gold standard. This involves complete removal of all prosthetic components, aggressive debridement, placement of an antibiotic-loaded cement spacer, a period of targeted intravenous antibiotic therapy, and then reimplantation of new components after infection eradication is confirmed. DAIR is generally reserved for acute PJI (symptoms <3-4 weeks) or well-fixed implants with less virulent organisms. Single-stage revision has a higher failure rate for chronic PJI. Arthrodesis or amputation are salvage procedures for failed two-stage revisions or severe bone loss/irreversible infection.

Question 50

A 70-year-old male is found to have elevated serum alkaline phosphatase (ALP) and characteristic findings of Paget's disease on X-rays (thickened cortex, trabecular coarsening) involving his tibia and pelvis. He is asymptomatic. Which of the following is generally considered an indication for medical treatment with bisphosphonates in Paget's disease?

Explanation

Indications for medical treatment (typically with bisphosphonates) in Paget's disease include: symptomatic disease (bone pain, neurological symptoms like hearing loss, nerve compression), active disease in high-risk locations (e.g., skull near vital structures, spine, weight-bearing long bones with risk of fracture), or prior to surgery on an affected bone to reduce hypervascularity and bone turnover, thereby minimizing blood loss and improving bone quality. Elevated ALP alone without symptoms is often observed, but not an absolute indication for treatment. Asymptomatic involvement of the skull is not an indication unless it is progressive or near vital structures. Normal hearing is not an indication for treatment.

Question 51

A 38-year-old male undergoes open reduction and internal fixation of a posterior column acetabular fracture via a Kocher-Langenbeck approach. Postoperatively, he develops foot drop. Which nerve is most commonly injured during this approach that could lead to this complication?

Explanation

The sciatic nerve is the most commonly injured nerve during posterior approaches to the acetabulum (e.g., Kocher-Langenbeck approach) due to its anatomical proximity to the posterior column and posterior wall. Injury to the peroneal division of the sciatic nerve typically manifests as foot drop (weakness in ankle dorsiflexion and eversion) and sensory loss in the dorsum of the foot. The femoral and obturator nerves are located anteriorly. The superior gluteal nerve innervates the gluteus medius and minimus, and its injury results in abductor weakness (Trendelenburg gait). The inferior gluteal nerve innervates the gluteus maximus, affecting hip extension.

Question 52

A 70-year-old male with severe neurogenic claudication due to lumbar spinal stenosis (L4-5) has failed 6 months of conservative management including NSAIDs, physical therapy, and epidural steroid injections. His symptoms significantly limit his ability to walk more than 50 meters. He has no progressive neurological deficits. What is the primary indication for surgical intervention in this patient?

Explanation

For lumbar spinal stenosis, in the absence of acute neurological emergencies like progressive motor weakness (e.g., foot drop) or cauda equina syndrome (bladder/bowel dysfunction), the primary indication for elective surgical decompression is persistent, debilitating symptoms (such as neurogenic claudication or severe radicular pain) that have failed an adequate trial of conservative management. While spondylolisthesis or scoliosis might be present and influence the specific surgical technique (e.g., requiring fusion), they are not the sole primary indication for surgery in the absence of debilitating symptoms or neurological deficits.

Question 53

A 78-year-old female sustains a fall and experiences pain in her left hip, which underwent total hip arthroplasty 10 years ago. Radiographs reveal a spiral fracture distal to the tip of a well-fixed femoral stem, with no evidence of loosening. According to the Vancouver classification, this fracture would be classified as:

Explanation

The Vancouver classification for periprosthetic femoral fractures categorizes fractures based on location and stem stability: Type A fractures occur in the trochanteric region. Type B fractures occur around the femoral stem; B1 involves a well-fixed stem, B2 involves a loose stem with good bone stock, and B3 involves a loose stem with poor bone stock. Type C fractures occur distal to the tip of the femoral stem. Since the fracture is described as spiral and distal to the tip of a well-fixed stem, it is classified as Vancouver Type C.

Question 54

A 15-year-old female presents with a progressive right thoracic curve measuring 55 degrees on Cobb angle, with significant truncal asymmetry. Her Risser sign is 4. She experiences mild back pain but no neurological deficits. What is the most appropriate management for this patient?

Explanation

For adolescent idiopathic scoliosis (AIS), surgical intervention, typically posterior spinal fusion, is indicated for curves greater than 45-50 degrees, especially in patients who are skeletally immature or approaching skeletal maturity (Risser 4 indicates near skeletal maturity). Brace treatment is generally recommended for progressive curves between 25-45 degrees in skeletally immature patients. Observation is for smaller curves or skeletally mature patients with non-progressive curves. Anterior vertebral body tethering is an emerging technique typically for younger, skeletally immature patients with significant growth remaining. Physical therapy is an adjunct but not a primary treatment for significant, progressive curves.

Question 55

A 60-year-old male with a history of metastatic renal cell carcinoma to the proximal femur presents with sudden onset of severe right thigh pain after a minor fall. Radiographs show a pathological subtrochanteric fracture. He has a 3-month life expectancy. What is the most appropriate surgical management principle for this patient?

Explanation

For pathological fractures of long bones due to metastatic disease, especially in patients with a limited life expectancy, the primary goals of surgical management are pain relief, early mobilization, and improved quality of life. Intramedullary nailing is an excellent choice for subtrochanteric and diaphyseal fractures as it provides stable fixation, allows immediate weight-bearing, and is a less extensive procedure compared to wide en bloc resection. Wide en bloc resection is usually reserved for primary bone tumors or highly selected metastases with long life expectancy. Percutaneous cement augmentation is not suitable for displaced long bone fractures. External fixation is generally a temporary measure. Radiation therapy is often an adjunct to surgery but insufficient as a standalone treatment for a displaced, unstable fracture.

Question 56

A 35-year-old male, a keen weightlifter, presents with chronic dorsal wrist pain and weakness 6 months after a fall onto an outstretched hand. Radiographs reveal a widened scapholunate gap (>3mm) and a 'Terry Thomas' sign. Dynamic imaging confirms scapholunate dissociation. What is the most appropriate surgical intervention for chronic, reducible scapholunate instability with preserved articular cartilage?

Explanation

For chronic, reducible scapholunate instability with preserved articular cartilage, direct repair of the scapholunate ligament is often not feasible due to chronic tissue attenuation. Therefore, ligament reconstruction using a local tendon graft (e.g., FCR, palmaris longus) or capsulodesis (e.g., Blatt capsulodesis, modified Brunelli) is a common and effective surgical option to restore stability. Scaphoid excision and four-corner fusion or proximal row carpectomy (SLAC wrist reconstruction) are salvage procedures reserved for later stages of scapholunate advanced collapse (SLAC wrist), which involves significant arthritis. Wrist arthrodesis is a definitive salvage for end-stage arthritis or instability.

Question 57

A 50-year-old obese female presents with progressive flattening of her left foot, pain along the medial ankle, and inability to perform a single-leg heel raise. Clinical examination shows a flexible hindfoot valgus and forefoot abduction. What stage of adult acquired flatfoot deformity (AAFD) does this presentation most likely represent, and what is the typical surgical management strategy?

Explanation

This patient's presentation with a progressive, flexible flatfoot deformity, medial ankle pain, hindfoot valgus, forefoot abduction, and inability to perform a single-leg heel raise is classic for Adult Acquired Flatfoot Deformity (AAFD) Stage II. Stage II is characterized by a flexible deformity with posterior tibial tendon (PTT) dysfunction. Surgical management for Stage II typically involves a combination of PTT debridement, flexor digitorum longus (FDL) tendon transfer to the navicular, and corrective osteotomies such as a medial displacement calcaneal osteotomy and/or lateral column lengthening (e.g., Evans calcaneal osteotomy) to restore the arch and alignment. Stage I involves PTT inflammation without deformity. Stage III involves a rigid deformity with associated arthritis, often requiring triple arthrodesis. Stage IV includes deltoid ligament failure and ankle valgus, often requiring more extensive fusions.

Question 58

A 30-year-old competitive soccer player is diagnosed with a symptomatic isolated International Cartilage Repair Society (ICRS) grade IV chondral defect (2.5 cm x 3.0 cm) on the medial femoral condyle. He has failed conservative management. Which of the following surgical options is generally considered most appropriate for this type and size of lesion in an active individual?

Explanation

For large (>2-2.5 cm²), symptomatic, full-thickness (ICRS Grade IV) chondral defects in active patients, biological solutions like Autologous Chondrocyte Implantation (ACI) or Matrix-Induced Autologous Chondrocyte Implantation (MACI) are generally considered the most appropriate treatment options. These techniques aim to regenerate hyaline-like cartilage and are suitable for larger lesions. Arthroscopic debridement and lavage offer only temporary symptomatic relief. Microfracture is typically reserved for smaller lesions (<2 cm²) and often results in fibrocartilage formation. The Osteochondral Autograft Transfer System (OATS) is suitable for smaller to medium-sized defects, but donor site morbidity limits its application for larger lesions. Total knee arthroplasty is for end-stage osteoarthritis, not an isolated chondral defect.

Question 59

A 40-year-old male sustains a severe open tibia fracture with a >10 cm laceration, extensive soft tissue damage, periosteal stripping, and significant contamination from a farm accident. The fracture is comminuted. There is no major neurovascular compromise. According to the Gustilo-Anderson classification, what is the most likely classification and initial management priority?

Explanation

The Gustilo-Anderson classification for open fractures: Type I (<1 cm wound, clean), Type II (1-10 cm wound, moderate soft tissue damage), Type III (>10 cm wound, extensive soft tissue damage). Type III is further subdivided: IIIA involves extensive soft tissue damage with adequate soft tissue coverage. Type IIIB involves extensive soft tissue loss, periosteal stripping, significant contamination, and exposed bone requiring flap coverage. Type IIIC includes an associated arterial injury requiring repair. This patient's description of a >10 cm laceration, extensive soft tissue damage, periosteal stripping, and significant contamination directly fits Type IIIB. The management priority for Type IIIB is aggressive irrigation and debridement, followed by plans for definitive soft tissue coverage (e.g., local or free flap) to prevent infection and promote healing.

Question 60

A 22-year-old long-distance runner complains of bilateral lower leg pain, tightness, and weakness that consistently develops 10-15 minutes into his runs and resolves with rest. Physical examination is unremarkable at rest, but palpable tenderness and firmness are noted in the anterior compartments bilaterally after exertion. There are no acute signs of compartment syndrome. What is the most definitive diagnostic test for chronic exertional compartment syndrome (CECS)?

Explanation

Chronic exertional compartment syndrome (CECS) is a clinical diagnosis confirmed by objective measurement of intramuscular compartment pressures. The most definitive diagnostic test involves measuring compartment pressures before, during, and typically 1 and 5 minutes after a standardized exercise that reproduces the patient's symptoms. Elevated pressures post-exercise, combined with characteristic symptoms that resolve with rest, are diagnostic. MRI may show muscle edema but is not definitive. CT scan is not useful. Resting compartment pressures are typically normal in CECS. EMG is used for nerve conduction studies to rule out nerve entrapment but is not diagnostic for CECS.

Question 61

A 48-year-old male presents after a high-energy motor vehicle collision with an associated posterior hip dislocation and a transverse acetabular fracture (Letournel & Judet classification). Post-reduction CT reveals a large posterior wall fragment, an incarcerated fragment within the joint, and significant articular step-off. Neurological examination is intact. What is the most appropriate definitive management strategy?

Explanation

This patient presents with an unstable acetabular fracture (transverse with a large posterior wall fragment) and an incarcerated fragment after posterior hip dislocation. The incarcerated fragment necessitates surgical removal to prevent post-traumatic arthritis. A transverse fracture, especially with posterior wall involvement, often requires ORIF. The Kocher-Langenbeck approach is ideal for posterior wall and posterior column fractures, allowing excellent visualization for fragment extraction and stable fixation. Percutaneous fixation is not suitable for incarcerated fragments or significant step-off. Conservative management is inappropriate for unstable, displaced fractures with incarcerated fragments. An ilioinguinal approach is primarily for anterior column/wall fractures. Arthroscopic debridement alone would not address the fracture displacement and instability.

Question 62

A 62-year-old female with a known history of metastatic breast cancer presents with acute onset severe back pain, progressive bilateral lower extremity weakness (3/5), and new urinary retention. MRI shows a large epidural metastasis at T11 causing severe spinal cord compression. She is hemodynamically stable. What is the MOST immediate and critical management step?

Explanation

This patient presents with acute spinal cord compression due to metastatic disease, evidenced by severe back pain, progressive motor weakness, and bladder dysfunction. The most immediate and critical management step is to initiate high-dose intravenous corticosteroids (e.g., Dexamethasone 10-16 mg IV bolus, then 4 mg q6h). Corticosteroids reduce peritumoral edema, which can alleviate pressure on the spinal cord and preserve neurological function while definitive treatment is planned. While emergent surgical decompression or radiation therapy will be necessary, corticosteroids provide immediate relief and are often initiated even before the patient reaches the operating room or radiation oncology. Analgesics alone do not address the cord compression. A biopsy is important for definitive diagnosis but should not delay critical management of cord compression.

Question 63

A 70-year-old male presents with a painful, swollen right knee 3 years after primary total knee arthroplasty (TKA). Aspiration yields purulent fluid with a WBC count of 95,000 cells/µL (92% PMNs) and initial Gram stain showing Gram-positive cocci in clusters. He has no draining sinus tract and good bone stock. The most appropriate surgical management for this periprosthetic joint infection (PJI) is:

Explanation

This patient presents with a chronic periprosthetic joint infection (PJI) (symptoms for 3 years post-op, high WBC, purulent aspirate) likely due to S. aureus. For chronic PJI, especially with an established infection over a year after implantation, a two-stage revision arthroplasty is generally considered the gold standard. This involves removal of all prosthetic components, thorough debridement, placement of an antibiotic-impregnated cement spacer, and a prolonged course of intravenous antibiotics, followed by reimplantation once the infection markers normalize. DAIR is typically reserved for acute infections (onset within weeks of surgery or acute hematogenous spread to a well-fixed prosthesis) with sensitive organisms and no loose components. One-stage revision may be considered in very select cases but carries a higher failure rate for established chronic infections. Suppressive antibiotics alone are palliative and not curative for such an active infection. Arthrodesis is a salvage procedure typically reserved for failed two-stage revisions or patients who cannot tolerate further surgery.

Question 64

A 15-year-old female with progressive adolescent idiopathic scoliosis (AIS) has a 70-degree main thoracic curve (T5-T12) with significant truncal decompensation and a kyphotic component. Pulmonary function tests show FVC 65% of predicted. Previous bracing failed. What is the most appropriate surgical strategy for correction?

Explanation

For a 15-year-old female with a 70-degree main thoracic curve and significant truncal decompensation due to AIS, posterior spinal fusion with pedicle screw instrumentation is the gold standard surgical treatment. This approach allows for excellent 3D correction of the deformity (coronal, sagittal, and axial plane), significant correction of the kyphosis, and stable fixation. Anterior fusion alone is less effective for large thoracic curves and often carries higher risks in the thoracic spine. VBT is typically considered for skeletally immature patients with smaller curves and aims to modulate growth, which is less effective for a 15-year-old with a 70-degree curve. Combined anterior and posterior approaches are reserved for very rigid or severe curves (often >90 degrees) or specific congenital deformities. Observation is not appropriate given the curve magnitude and pulmonary compromise.

Question 65

A 35-year-old male sustains a high-energy pilon fracture (OTA/AO 43-C3) with extensive comminution, significant soft tissue swelling, and tense blisters over the ankle. Initial management includes a temporary spanning external fixator. What is the most appropriate timing for definitive open reduction and internal fixation (ORIF)?

Explanation

For high-energy pilon fractures with significant soft tissue compromise (swelling, blistering), a staged approach is crucial to minimize wound complications. Initial management involves temporizing with a spanning external fixator to restore length, alignment, and indirectly reduce some fragments, allowing the soft tissue envelope to recover. Definitive ORIF should be delayed until the soft tissues are amenable to surgery, which is typically 7-14 days post-injury when the 'wrinkle sign' is present (meaning the skin can be easily wrinkled). Operating immediately on compromised soft tissues significantly increases the risk of wound breakdown, infection, and poor outcomes. External fixation alone is usually not definitive for articular fractures requiring precise reduction, unless the patient is too medically unstable for ORIF.

Question 66

A 55-year-old diabetic male has chronic osteomyelitis of the distal tibia following an open fracture 8 months prior, which was treated with ORIF. He presents with a persistent draining sinus tract, localized pain, and imaging showing cortical destruction and a large sequestrum adjacent to the hardware. What is the most critical surgical step for definitive treatment?

Explanation

For chronic osteomyelitis, especially with a sequestrum (devitalized bone), the most critical surgical step is aggressive and complete debridement of all non-viable bone and infected soft tissues until bleeding bone is encountered ('paprika sign'). This removes the bacterial nidus. While hardware removal is often necessary if it's infected or hindering debridement, it's the debridement itself that's paramount. Antibiotics are adjunctive to surgical debridement; they cannot penetrate devitalized bone. Bone grafting is typically performed later, after eradication of infection and normalization of inflammatory markers, to fill the defect. An external fixator might be used for stability post-debridement, but it's not the primary definitive treatment step for infection eradication.

Question 67

A 72-year-old female presents with severe, chronic low back pain radiating into both legs, worse with standing and ambulation, and significantly improved with sitting. Radiographs show a long-segment degenerative lumbar scoliosis (40 degrees) with a positive sagittal vertical axis (SVA) of 8 cm. Conservative management has failed. What is the primary goal of surgical correction for this patient?

Explanation

This patient presents with adult degenerative scoliosis with severe symptoms and a positive sagittal vertical axis (SVA) of 8 cm, indicating significant sagittal imbalance. While decompression and coronal correction are components, the primary goal of surgical correction in adult spinal deformity, especially with a positive SVA, is the restoration of sagittal balance. Sagittal imbalance is strongly correlated with pain and functional disability. Correcting the positive SVA (ideally to a slightly negative or neutral range, -2 to +2 cm) by restoring lumbar lordosis and harmonizing pelvic parameters is crucial for long-term functional improvement and pain relief. Simply decompressing or correcting the coronal curve without addressing sagittal balance often leads to suboptimal outcomes or 'flatback syndrome.'

Question 68

An 80-year-old female sustains a fall and develops a Vancouver B2 periprosthetic fracture around a well-fixed femoral stem after a total hip arthroplasty performed 10 years ago. She has good medical health. What is the most appropriate surgical management?

Explanation

A Vancouver B2 periprosthetic fracture involves the femur around a well-fixed stem. The critical issue is that while the original stem is well-fixed, the bone around it is compromised, and the fracture extends beyond the stem. Simply plating around the existing stem (ORIF) would leave the osteoporotic bone susceptible to further fracture or non-union due to the stress riser created by the plate-stem interface. Therefore, the most appropriate management is revision total hip arthroplasty, using a longer, usually cementless stem that bypasses the fracture by at least two cortical diameters, providing robust fixation and stability. This approach addresses both the fracture and the underlying compromised bone. Non-weight-bearing is not suitable for an unstable fracture. Cerclage wires alone provide insufficient stability. Girdlestone is a salvage procedure typically reserved for intractable infection or severe bone loss where other options are not feasible.

Question 69

A 28-year-old male sustains a complete avulsion of the C5-T1 nerve roots from the spinal cord following a high-energy motorcycle accident, resulting in a flail upper extremity. Clinical examination and MRI confirm preganglionic avulsion. Electromyography (EMG) at 3 months post-injury shows no signs of reinnervation. What is the most appropriate surgical option to restore some function?

Explanation

In a preganglionic brachial plexus avulsion, the nerve roots are torn from the spinal cord, making direct repair or grafting impossible as there is no distal stump from the spinal cord. Therefore, nerve transfers are the preferred surgical option. This involves transferring healthy, expendable nerves (e.g., intercostal nerves, spinal accessory nerve, contralateral C7) to reinnervate critical muscles, primarily for shoulder stability, elbow flexion, and potentially wrist extension. Neurolysis and direct repair/grafting are only possible for postganglionic injuries where the nerve continuity can be restored. Shoulder arthrodesis is a salvage procedure for a completely flail arm, usually performed after nerve reconstruction attempts have failed or are not indicated.

Question 70

A 70-year-old female on long-term bisphosphonate therapy (alendronate for 7 years) for osteoporosis presents with dull, aching thigh pain for 6 months. A recent fall resulted in a complete, transverse fracture of the subtrochanteric femur with characteristic cortical thickening laterally. What is the most important component of her management, in addition to surgical fixation?

Explanation

This patient presents with a classic atypical femoral fracture (AFF), which is strongly associated with long-term bisphosphonate use. While surgical fixation (typically intramedullary nailing) is necessary for a complete fracture, the most important medical management is to discontinue bisphosphonate therapy. Bisphosphonates suppress bone turnover, which is thought to contribute to the accumulation of microdamage and lead to these characteristic fractures. Continuing bisphosphonates would hinder bone healing. Calcium and Vitamin D are generally part of osteoporosis management but are not the primary, immediate medical management for an AFF. Weight-bearing is not indicated until after stable surgical fixation, and genetic testing is not typically indicated for AFFs.

Question 71

A 15-year-old female presents with recurrent patellar dislocations despite rigorous physical therapy. MRI shows severe trochlear dysplasia, patella alta (Caton-Deschamps index 1.5), and an increased tibial tubercle-trochlear groove (TT-TG) distance of 20 mm. What is the most appropriate surgical approach for definitive treatment?

Explanation

This patient has multiple predisposing factors for patellofemoral instability: recurrent dislocations, severe trochlear dysplasia, patella alta, and a significantly increased TT-TG distance (normal < 15mm, >20mm is severe). For such complex instability with multiple anatomical risk factors, a combined procedure is usually necessary. Tibial tubercle osteotomy (e.g., medialization and/or distalization) addresses the increased TT-TG distance and patella alta, improving patellar tracking. MPFL reconstruction provides static medial restraint. Therefore, a combination of tibial tubercle osteotomy and MPFL reconstruction is the most appropriate and effective surgical approach to stabilize the patella and prevent recurrence. Isolated MPFL reconstruction is insufficient for severe dysplasia and TT-TG distance. Lateral release can exacerbate instability. Patellectomy is a salvage procedure. Femoral osteotomy might be considered for severe rotational malalignment, but the primary issues here are patellar height and tracking.

Question 72

A 60-year-old diabetic male presents with a painful, deformed right foot, characterized by a 'rocker-bottom' deformity, collapse of the midfoot arch, and a plantar ulceration beneath the prominence. Radiographs show extensive disorganization of the midfoot joints, fragmentation, and new bone formation, consistent with active Charcot neuroarthropathy (Eichenholtz Stage II). He has good peripheral pulses. What is the primary surgical goal for this condition?

Explanation

This patient has an active Charcot neuroarthropathy with a significant deformity and plantar ulceration, placing him at high risk for infection and limb loss. While conservative management (total contact casting) is initially pursued for acute Charcot, surgical intervention is indicated for unstable deformities that lead to ulceration and risk of infection. The primary surgical goal is arthrodesis (fusion) with correction of the deformity and rigid internal fixation. This aims to stabilize the foot, eliminate the rocker-bottom prominence, and prevent recurrent ulceration, ultimately preserving the limb. Amputation is a salvage procedure. Long-term non-weight-bearing in a cast is appropriate for acute Charcot without severe deformity or for a non-surgical candidate but does not correct fixed deformity. Debridement alone won't address the underlying bony prominence. Prophylactic fixation is not applicable once deformity is established.

Question 73

A 45-year-old construction worker presents with chronic radial-sided wrist pain, weakness, and clicking following a fall onto an outstretched hand 5 years prior. Radiographs show advanced scapholunate advanced collapse (SLAC) wrist with severe radioscaphoid arthritis and preserved capitolunate joint. Conservative measures have failed. What is the most appropriate surgical treatment?

Explanation

This patient has advanced SLAC wrist with severe radioscaphoid arthritis but a preserved capitolunate joint. Scapholunate ligament repair is only effective for acute, reducible injuries. Radial styloidectomy is insufficient. Total wrist arthrodesis is a salvage procedure for end-stage arthritis affecting all carpal joints, but it sacrifices all wrist motion. Proximal row carpectomy removes the diseased radioscaphoid joint but may lead to capitolunate arthritis over time. The most appropriate treatment for advanced SLAC wrist with preserved capitolunate articulation is a four-corner fusion (also known as scaphoid excision and capitolunate-hamate-triquetrum fusion). This procedure eliminates the painful radioscaphoid articulation, preserves a reasonable amount of wrist motion (primarily from the radiolunate joint), and is durable. It's preferred over total wrist fusion for patients who need to maintain some wrist motion.

Question 74

A 7-year-old child presents 5 days after a fall with a displaced (Gartland Type III) supracondylar humerus fracture. The elbow is significantly swollen and tense, with a palpable but diminished radial pulse. Capillary refill in the fingers is delayed to 4 seconds, and he has pain with passive finger extension. Neurological examination of the median, ulnar, and radial nerves is intact. What is the most urgent management step?

Explanation

This child presents with a Gartland Type III supracondylar humerus fracture with clear signs of impending vascular compromise: diminished radial pulse, delayed capillary refill, and severe pain with passive finger extension (suggestive of compartment syndrome, though pain is the earliest and most reliable sign). The swelling and delayed presentation (5 days) increase the risk. While closed reduction and pinning is the usual treatment for Gartland III, the presence of critical vascular compromise (pulselessness or diminished pulse with signs of ischemia) mandates immediate surgical intervention. For delayed presentations with severe swelling and vascular compromise, open reduction, vascular exploration (to assess for brachial artery entrapment or injury), and then fixation is often necessary. A CT angiogram delays critical intervention. Observation is contraindicated. An arthrogram is not indicated for vascular compromise.

Question 75

A 17-year-old male is diagnosed with a high-grade osteosarcoma of the distal femur. Staging shows no evidence of metastatic disease. He undergoes neoadjuvant chemotherapy, followed by wide en bloc resection and limb salvage with an endoprosthetic reconstruction. Which of the following is the most important factor for long-term oncologic control and local recurrence prevention in this case?

Explanation

For limb salvage surgery in osteosarcoma, achieving negative microscopic surgical margins (R0 resection) is the single most important factor for local tumor control and preventing local recurrence. Any residual tumor cells at the margin (R1 or R2 resection) significantly increase the risk of recurrence and negatively impact prognosis. While other factors like chemotherapy response, type of reconstruction, and rehabilitation are important for overall outcome and function, they do not supersede the critical importance of clear oncologic margins for disease control. The choice of endoprosthesis affects function and mechanical longevity, not oncologic control. Return to high-impact sports is a functional goal, not an oncologic one. Adjuvant chemotherapy duration is determined by protocol and response, and its efficacy relies on complete surgical removal of the primary tumor.

Question 76

A 38-year-old overhead athlete reports progressive right arm and hand pain, numbness in the ulnar distribution, and easy fatigability of the arm with overhead activities. Physical exam reveals a positive Adson's test, and reproduction of symptoms with hyperabduction. Nerve conduction studies and EMG are normal, and cervical MRI is unremarkable. What is the most appropriate initial management for this condition?

Explanation

This patient presents with symptoms highly suggestive of neurogenic thoracic outlet syndrome (TOS), characterized by pain, paresthesias in an ulnar distribution, and arm fatigability with overhead activities, exacerbated by specific maneuvers (Adson's, hyperabduction). Crucially, EMG and NCS are often normal in neurogenic TOS. Given no 'hard signs' of vascular compromise or severe neurological deficit, the initial management is conservative. Physical therapy, focusing on correcting posture, strengthening shoulder girdle muscles, stretching tight scalenes/pectorals, and nerve gliding exercises, is the cornerstone of initial treatment and is successful in a significant number of patients. Botox injections are experimental and reserved for specific cases. Surgical decompression is considered if conservative treatment fails. Angiography is for vascular TOS. Opioids are for symptom management, not treatment of the underlying cause.

Question 77

A 26-year-old professional basketball player undergoes a revision ACL reconstruction using an allograft after experiencing recurrent instability 6 months following his primary ACL reconstruction. Six months post-operatively from the revision, he experiences a 'giving way' episode, and an MRI shows a partial graft tear. The original tunnels were deemed well-placed during the revision surgery. What is the most likely cause of failure in this scenario?

Explanation

In this scenario, the patient had a revision ACL with an allograft, and a partial graft tear occurred 6 months post-op despite 'well-placed tunnels.' While early return to sport and rehabilitation non-compliance can contribute, biological healing failure or issues with allograft incorporation are a very common cause of early revision ACL failure, especially with allografts. Allografts have a slower incorporation and remodeling process compared to autografts, and there's a higher risk of inferior biological healing and higher re-rupture rates. Technical errors (like malpositioned tunnels) are a primary cause of primary ACL failure, but in revision surgery, the existing tunnels are carefully assessed and addressed. Concomitant injuries should have been identified. The 6-month timeline is early for a solid allograft. Therefore, compromised biological integration of the allograft is the most likely culprit.

Question 78

A 28-year-old male sustains a severe crush injury to his forearm during an industrial accident, resulting in comminuted radius and ulna shaft fractures. Six hours post-injury, he reports excruciating, constant forearm pain unresponsive to analgesics. On examination, his forearm is tense and swollen, he has severe pain with passive extension of his fingers, and decreased sensation in the median nerve distribution. Distal radial and ulnar pulses are palpable. What is the most crucial surgical step?

Explanation

This patient presents with classic signs and symptoms of acute forearm compartment syndrome: excruciating pain out of proportion to injury, pain with passive stretch of fingers, tense compartments, and early sensory deficits (median nerve). While pulses may still be palpable initially, compartment pressures are likely elevated to critical levels. The most crucial and time-sensitive surgical step is an immediate forearm fasciotomy to decompress all involved compartments (superficial volar, deep volar, dorsal, mobile wad). Delay in fasciotomy can lead to irreversible muscle necrosis, nerve damage, and Volkmann's ischemic contracture. Open reduction and internal fixation of the fractures may follow fasciotomy, but decompression is primary. Nerve decompression alone is insufficient. Observation or cast application is contraindicated as it will worsen the ischemia.

Question 79

A 68-year-old male presents with chronic, severe right shoulder pain and weakness, with an inability to actively abduct or forward elevate his arm beyond 45 degrees (pseudoparalysis). MRI reveals a massive, irreparable rotator cuff tear involving the supraspinatus, infraspinatus, and subscapularis, with severe fatty infiltration and superior humeral head migration. What is the most appropriate surgical option to restore function and alleviate pain?

Explanation

This patient has a massive, irreparable rotator cuff tear with pseudoparalysis and superior humeral head migration (cuff tear arthropathy). Debridement and decompression or partial repair are insufficient for such a condition. Latissimus dorsi transfer is an option, primarily to restore external rotation and some abduction, but its efficacy in restoring significant active elevation in pseudoparalysis due to massive tears is limited, especially with subscapularis involvement. Superior capsular reconstruction (SCR) is a newer technique for irreparable tears to restore stability and function but has specific indications and may not be sufficient for severe pseudoparalysis and arthropathy. Reverse total shoulder arthroplasty (rTSA) is the gold standard for treating irreparable rotator cuff tears with pseudoparalysis and/or rotator cuff arthropathy. It reverses the ball-and-socket anatomy, medializing the center of rotation and using the deltoid muscle as the primary elevator, effectively restoring active elevation and significantly improving pain.

Question 80

A 55-year-old male with poorly controlled diabetes presents with severe, unrelenting low back pain, fever, chills, and elevated inflammatory markers (ESR 100 mm/hr, CRP 150 mg/L). MRI shows L5-S1 discitis and osteomyelitis with a small epidural abscess, but neurological examination is entirely intact. What is the primary goal of initial management?

Explanation

This patient presents with spinal infection (discitis/osteomyelitis) and an epidural abscess. While antibiotics are crucial, the most urgent initial step for any epidural abscess, even without overt neurological deficit, is to identify the pathogen and source. For a small epidural abscess with an intact neurological exam, the primary goal of initial management is obtaining a tissue diagnosis (via CT-guided percutaneous biopsy) and then initiating appropriate broad-spectrum intravenous antibiotics. Surgical decompression is indicated urgently if there is progressive neurological deficit, severe spinal instability, or failure of conservative (antibiotic) management. Without neurological compromise, immediate surgery is generally not the first step. Pain management and radiation therapy alone do not address the infection. The answer states 'primary goal of initial management' and while antibiotics are part, getting the diagnosis (culture) to guide treatment is critical before initiating empirical antibiotics without knowing the pathogen.

Question 81

Explanation

This patient presents with spinal infection (discitis/osteomyelitis) and a small epidural abscess. While surgical decompression is indicated for progressive neurological deficit or severe instability, for a patient with an intact neurological exam, the primary goal of initial management is to identify the causative organism and initiate appropriate antibiotics. This typically involves obtaining cultures (e.g., via CT-guided biopsy of the disc space or epidural abscess) followed by the immediate initiation of empirical broad-spectrum intravenous antibiotics. This combination aims to control the infection and prevent neurological deterioration. Percutaneous drainage may be considered for larger abscesses but isn't always primary. Pain management is supportive. Radiation therapy is not indicated for infection.

Question 82

A 55-year-old male presents with persistent low back pain radiating to his left buttock and perineum following a motor vehicle accident. He denies bowel or bladder dysfunction but reports difficulty with left foot plantarflexion and decreased sensation over the posterior aspect of his left leg and sole of his foot. An MRI reveals a comminuted L5 sacral fracture extending into the S1 foramen (Denis Zone III). Which of the following is the most critical initial management step specific to this fracture type?

Explanation

Denis Zone III sacral fractures involve the lateral sacral mass and are associated with a high risk of lumbosacral plexopathy and nerve root injury, particularly the S2-S4 nerve roots which control bowel, bladder, and sexual function. While spinopelvic dissociation and operative fixation are important considerations, the immediate and most critical step for this specific fracture type with neurological symptoms is a thorough neurological examination to precisely document the deficits, especially S2-S4 function, which guides subsequent management decisions and allows for prognosis. Early detection of cauda equina syndrome, although not explicitly stated here, would be an emergency requiring immediate decompression. Assessment for spinopelvic dissociation is crucial for stability but a detailed neurological exam takes precedence for acute management of neurological compromise.

Question 83

A 68-year-old female presents with progressive sagittal imbalance, chronic debilitating low back pain, and claudication-type symptoms that limit her walking distance to less than 100 meters. Radiographs reveal severe adult degenerative scoliosis with a Pelvic Incidence (PI) of 60 degrees and a Lumbar Lordosis (LL) of 20 degrees. Her Sagittal Vertical Axis (SVA) is +15 cm. For surgical planning, which of the following radiographic parameters is the primary target for correction to improve her clinical symptoms?

Explanation

The patient exhibits severe sagittal imbalance (SVA +15 cm) and a significant PI-LL mismatch (60-20 = 40 degrees). In adult spinal deformity, the PI-LL mismatch is a crucial parameter that directly correlates with clinical outcomes and quality of life. The goal of surgical correction for sagittal balance is typically to achieve a PI-LL mismatch of less than 10 degrees (ideally within 0 to +10 degrees) and an SVA of less than 5 cm. While other parameters like PT and TK are important components of global spinal alignment, the PI-LL mismatch is considered a primary driver of sagittal balance and symptoms in degenerative scoliosis.

Question 84

A 16-year-old male is diagnosed with high-grade osteosarcoma of the proximal tibia, characterized by significant extra-osseous extension and involvement of the neurovascular bundle, but without distant metastasis. Chemotherapy has been initiated. When considering surgical options, which of the following factors would most strongly favor amputation over limb salvage, even with clear surgical margins achievable by either method?

Explanation

While obtaining clear surgical margins is paramount for oncologic control, the choice between limb salvage and amputation is heavily influenced by the anticipated functional outcome. Significant involvement of the neurovascular bundle or critical muscles, even if resectable with clear margins, may lead to a limb salvage procedure with very poor function, chronic pain, or neurological deficits. In such cases, a well-fitted prosthesis after amputation might offer superior functional quality of life compared to a non-functional or painful reconstructed limb. The patient's age and desire for sports are secondary considerations to the fundamental functional prognosis.

Question 85

A 9-year-old boy with spastic diplegia (GMFCS Level III) presents with a progressively worsening crouch gait characterized by excessive knee flexion, hip flexion, and ankle dorsiflexion, despite previous hamstring and gastrocnemius lengthenings. Clinical examination reveals patella alta and a stiff-knee gait pattern. Which surgical intervention is most likely indicated to address the specific issue of excessive knee flexion and improve his gait kinematics?

Explanation

A crouch gait in cerebral palsy, especially with patella alta and stiff-knee gait, often results from persistent quadriceps overactivity and weakness of the hip extensors and ankle plantarflexors. Distal femoral extension osteotomy aims to extend the knee by correcting the femorotibial angle. When combined with patellar tendon advancement, it can lower the patella and improve quadriceps leverage, thus addressing the patella alta and the excessive knee flexion in swing phase and stance. Proximal femoral varus derotation osteotomy addresses hip deformities but not directly the knee crouch. Tibial tubercle transfer for patella baja is for the opposite problem. Selective dorsal rhizotomy reduces spasticity but does not correct fixed bony deformities or restore muscle balance in the same way. Repeated hamstring lengthenings alone may exacerbate the crouch if not accompanied by quadriceps balance.

Question 86

A 28-year-old male sustains a complete avulsion of the C5 and C6 nerve roots from the spinal cord following a high-energy motorcycle accident. Six months post-injury, he has no voluntary contraction in his deltoid, biceps, or wrist extensors. Electromyography confirms no reinnervation across the C5-C6 territory. For restoration of elbow flexion, which of the following nerve transfer options is generally considered the most effective for a patient with C5-C6 avulsion?

Explanation

For complete C5-C6 root avulsion, where no proximal nerve stumps are available for grafting, nerve transfers are the treatment of choice to restore function, particularly elbow flexion. The Oberlin transfer (transfer of a fascicle from the ulnar nerve to the biceps branch of the musculocutaneous nerve) is a highly effective and commonly utilized procedure for restoring elbow flexion, as it provides a strong, reliable donor with minimal donor site morbidity. Intercostal nerves can be used but provide less robust power. Accessory to suprascapular is for shoulder abduction/external rotation. Pectoralis major motor branch is an option but less commonly used than Oberlin for isolated C5-C6. Phrenic nerve transfer is considered a last resort due to potential respiratory compromise.

Question 87

A 40-year-old construction worker falls from a height, sustaining a high-energy comminuted intra-articular fracture of the distal tibia (Pilon fracture, AO/OTA 43-C3) with significant swelling and multiple skin blisters visible. There are no signs of open fracture or neurovascular compromise. What is the most appropriate initial management strategy?

Explanation

High-energy Pilon fractures often present with severe soft tissue injury, including significant swelling and blistering. Immediate definitive ORIF in such circumstances carries a very high risk of wound complications, infection, and flap necrosis. The standard of care for these injuries is a staged approach. Initial management involves temporizing external fixation to stabilize the fracture, restore length, and allow the soft tissues to recover (swelling reduction, blister resolution). Definitive ORIF is then performed electively, typically 7-14 days later, when the 'wrinkle sign' is present, indicating adequate soft tissue readiness. Immediate traction might reduce some swelling but is less effective for stabilization than external fixation.

Question 88

A 65-year-old patient undergoes a total knee arthroplasty (TKA). Three months post-operatively, he develops increasing knee pain, swelling, warmth, and purulent drainage from the surgical site. Synovial fluid analysis reveals a white blood cell count of 55,000 cells/µL with 92% neutrophils, and culture grows Methicillin-Sensitive Staphylococcus Aureus (MSSA). Which of the following is the most appropriate management strategy?

Explanation

The patient presents with an acute periprosthetic joint infection (PJI) within 3 months of TKA, with purulent drainage and high WBC count, and a positive culture for MSSA. DAIR (Debridement, Antibiotics, and Implant Retention) is an option for acute infections (<3-6 weeks symptoms, stable implant, sensitive organism, healthy soft tissues), but the presence of purulent drainage and a 3-month duration makes DAIR less likely to be successful alone, as the biofilm is likely established. One-stage revision arthroplasty can be considered for acute PJI with specific criteria (good soft tissue envelope, known organism, susceptible to antibiotics, non-virulent organism). However, for established acute PJI with purulence and a virulent organism like S. aureus, a two-stage revision arthroplasty remains the gold standard. This involves removal of all components, thorough debridement, placement of an antibiotic-laden cement spacer, and 6-8 weeks of systemic antibiotics, followed by reimplantation if infection markers normalize. Suppressive antibiotics are for patients who are not surgical candidates. Arthrodesis is a salvage procedure.

Question 89

A 22-year-old male sustains a high-energy knee dislocation following a skiing accident. Physical examination reveals gross instability in both valgus and varus stress, a positive posterior drawer, and hyperextension. Distal pulses are palpable but weak, and the foot is cool to touch. Which of the following is the most critical immediate concern and first step in management?

Explanation

Knee dislocations carry a significant risk of popliteal artery injury, which can lead to limb loss if not promptly identified and treated. Any sign of vascular compromise (weak pulse, coolness, pallor, paresthesias) dictates immediate action. While reduction of the dislocation should be performed promptly to relieve tension on the neurovascular structures, the most critical immediate concern and first step when pulses are weak and the foot is cool is to formally assess vascular integrity, typically with angiography (CT angiography is often preferred acutely). Delay in diagnosing and treating arterial injury can result in irreversible ischemia and amputation. Surgical stabilization of ligaments is typically delayed until vascular integrity is ensured and stabilized.

Question 90

A 50-year-old diabetic patient presents with a 6-month history of a persistent sinus tract in the proximal tibia, unresponsive to multiple courses of oral antibiotics. Plain radiographs show sequestrum and involucrum formation. A bone biopsy confirms chronic osteomyelitis with culture growing Pseudomonas aeruginosa. After thorough debridement, a significant bone defect remains. Which of the following is the most appropriate next step in the surgical management of this chronic osteomyelitis?

Explanation

For chronic osteomyelitis, the surgical management principles include aggressive debridement of all non-viable and infected bone and soft tissue, management of dead space, and targeted antibiotic therapy. After debridement creates a bone defect (dead space), filling this space is crucial to prevent hematoma formation and provide a high local concentration of antibiotics. Antibiotic-impregnated cement beads (PMMA) or calcium sulfate pellets are commonly used to fill dead space and deliver high local antibiotic concentrations, which is superior to systemic antibiotics alone for localized eradication. Free vascularized fibula grafts are considered for larger, critical bone defects, usually as a reconstructive step after infection control. Primary wound closure after significant dead space can lead to fluid accumulation and recurrence. NPWT is useful for soft tissue management but not typically sufficient for internal dead space filling in osteomyelitis.

Question 91

An 82-year-old female presents with a distal radius fragility fracture. Her DEXA scan reveals a T-score of -3.2 at the lumbar spine and -3.0 at the femoral neck. She has been on oral alendronate for 5 years and has previously fractured her vertebral body and humerus. Her renal function is normal. Which of the following is the most appropriate next step in her osteoporosis management?

Explanation

This patient has severe osteoporosis with multiple fragility fractures despite 5 years of oral bisphosphonate therapy, indicating a 'failure' of bisphosphonate treatment. In such cases, switching to an anabolic agent is the most appropriate next step. Teriparatide (a parathyroid hormone analog) and romosozumab (a sclerostin inhibitor) are potent bone-forming agents that are highly effective in patients who fail bisphosphonates or have very severe osteoporosis. Increasing the dose of alendronate or switching to another oral bisphosphonate is unlikely to be effective. Calcium and Vitamin D are supportive but not sufficient for severe osteoporosis. Discontinuing medication would leave her at very high risk for further fractures.

Question 92

A 70-year-old patient with long-standing rheumatoid arthritis (RA) and poorly controlled disease presents with progressive upper extremity weakness, hyperreflexia, and gait ataxia. Plain radiographs of the cervical spine show an atlantoaxial distance (ADI) of 7 mm on flexion and a Basilar Invagination with migration of the odontoid process above McGregor's line. What is the most appropriate surgical management for this patient?

Explanation

The patient exhibits symptoms and radiographic signs of significant cervical myelopathy due to atlantoaxial instability (ADI > 3.5 mm is unstable) and basilar invagination, common complications of advanced RA affecting the cervical spine. Basilar invagination indicates cranial settling with compression of the brainstem/spinal cord. While posterior atlantoaxial fusion addresses atlantoaxial instability, the presence of basilar invagination (odontoid migration above McGregor's line) and myelopathy often necessitates extending the fusion to include the occiput, i.e., occipitocervical fusion, especially when there is evidence of brainstem compression or if the C1-C2 facets are significantly eroded making C1-C2 fixation impossible. Therefore, occipitocervical fusion is the most appropriate and definitive management for this combined instability and compression. ACDF is for lower cervical pathology. Laminectomy would worsen instability. Halo vest is temporary stabilization.

Question 93

A 35-year-old professional tennis player reports insidious onset of deep, aching pain in the posterior aspect of her right shoulder, exacerbated by overhead serves. She also notes progressive weakness in external rotation and abduction. Clinical examination reveals isolated atrophy of the infraspinatus and supraspinatus muscles. Electrodiagnostic studies confirm suprascapular neuropathy at the spinoglenoid notch. What is the most common etiology for suprascapular nerve compression at this specific location?

Explanation

Suprascapular neuropathy at the spinoglenoid notch (which affects the infraspinatus motor branch and sensory branches, often sparing the supraspinatus initially if the compression is distal to its innervation) is most commonly caused by a ganglion cyst originating from the glenohumeral joint, particularly associated with posterior labral tears. Repetitive overhead activities can contribute to labral pathology and cyst formation. Compression at the suprascapular notch (by the superior transverse scapular ligament) typically affects both supraspinatus and infraspinatus. While massive rotator cuff tears can sometimes be associated, they are not the primary cause of isolated nerve compression at the spinoglenoid notch. Brachial plexus injury would have a broader deficit. Os acromiale is associated with impingement, not direct nerve entrapment at this location.

Question 94

A 25-year-old male sustains a severe crush injury to his right forearm, resulting in significantly elevated compartment pressures confirmed by direct measurement (55 mmHg in the superficial volar compartment). He complains of severe, unremitting pain, paresthesias in his fingers, and pain on passive extension of his digits. What is the definitive immediate management for this condition?

Explanation

The patient's symptoms (severe pain, paresthesias, pain on passive stretch, elevated compartment pressures) are classic for acute compartment syndrome. This is a surgical emergency. The definitive immediate management is an emergency fasciotomy of all affected compartments to relieve pressure and prevent irreversible muscle and nerve damage. Delay in treatment can lead to Volkmann's ischemic contracture, nerve palsy, or limb loss. Elevation, ice, and compression dressings are contraindicated as they can exacerbate ischemia. Analgesics address symptoms but not the underlying pathophysiology. Observation would be negligent given the confirmed high pressures and clinical signs.

Question 95

A 40-year-old recreational athlete presents with chronic, refractory patellar tendinopathy (jumper's knee) for over a year, unresponsive to standard conservative treatments including rest, physical therapy, eccentric exercises, and NSAIDs. MRI shows degenerative changes in the patellar tendon. Which of the following biological treatments has demonstrated some evidence of efficacy in such cases, typically by promoting local healing and reducing pain?

Explanation

For chronic patellar tendinopathy refractory to conventional treatments, platelet-rich plasma (PRP) injections have shown some promising results in promoting tendon healing and pain relief, though the evidence is still evolving and mixed. PRP concentrates growth factors and cytokines from the patient's own blood, which are believed to stimulate tissue repair. Autologous chondrocyte implantation (ACI) is for cartilage defects. Bone marrow aspirate concentrate (BMAC) contains mesenchymal stem cells but is less commonly used for tendinopathy than PRP. Hyaluronic acid is primarily for osteoarthritis. Embryonic stem cell transplantation is experimental and not clinically applied for this condition.

Question 96

A 60-year-old diabetic patient with a history of peripheral neuropathy presents with a rapidly progressive, warm, swollen, erythematous, and painful right foot. X-rays reveal disorganization of the midfoot joints, fragmentation of articular surfaces, and a 'rocker-bottom' deformity. There are no systemic signs of infection (normal WBC, CRP). What is the most critical immediate management strategy?

Explanation

This clinical presentation is characteristic of acute Charcot neuroarthropathy. While infection must always be ruled out in a diabetic foot, the absence of systemic signs and the specific radiographic findings point towards Charcot. The most critical immediate management is to protect the foot from further collapse and deformity by offloading. Strict non-weight bearing with a total contact cast (TCC) is the gold standard for acute Charcot foot. This immobilizes the joints, distributes pressure evenly, and reduces the inflammatory response, preventing further bone destruction. Surgical fusion is considered for stable deformities or non-bracable feet after the acute phase. Antibiotics are not indicated unless infection is confirmed. Elevation and ice are insufficient. Over-the-counter pain relievers do not address the progressive destruction.

Question 97

A 50-year-old carpenter presents with chronic wrist pain and stiffness, particularly on the ulnar side, that has progressively worsened over 5 years. Radiographs show significant scapholunate advanced collapse (SLAC) wrist, characterized by a widened scapholunate gap, proximal migration of the capitate, and arthritic changes between the capitate and scaphoid, and radius and scaphoid (Stage II). Which of the following surgical procedures is the most appropriate option for symptomatic relief and functional improvement in this condition?

Explanation

For SLAC wrist Stage II, where there is arthritis between the scaphoid and capitate, and between the scaphoid and radius, but the radiolunate joint is preserved, Scaphoid Excision and Four-Corner Fusion (4CF), also known as triscaphe fusion, is a common and effective surgical option. This procedure involves excising the diseased scaphoid and fusing the capitate, hamate, triquetrum, and lunate. This provides a stable, pain-free midcarpal joint while preserving some wrist motion through the radiolunate articulation. Scapholunate ligament repair is for acute or subacute instability before arthritic changes. Proximal row carpectomy (PRC) is an alternative but is contraindicated if there are significant lunate or capitate chondral changes. Total wrist arthrodesis is a salvage procedure that eliminates all wrist motion. Radioscapholunate arthrodesis would fuse the radiolunate joint, which is still healthy in SLAC II.

Question 98

A 30-year-old male sustains an L1 burst fracture (AO/OTA type A3) after falling from a ladder. Neurological examination is completely normal. CT scan shows 60% canal compromise and a local kyphosis of 15 degrees. Considering the absence of neurological deficit and the specific fracture morphology, which factor is most crucial in deciding between non-operative management with bracing versus surgical fixation?

Explanation

For thoracolumbar burst fractures without neurological deficit, the integrity of the posterior ligamentous complex (PLC) is the most crucial factor in determining spinal stability and the risk of progressive kyphosis. If the PLC is intact, non-operative management with bracing can be considered, even with significant canal compromise, as the spine maintains stability. However, a disrupted PLC (often indicated by spinous process widening, facet distraction, or specific MRI findings) indicates instability and generally necessitates surgical stabilization to prevent progressive deformity and potential neurological sequelae. Canal compromise alone, if the PLC is intact, does not mandate surgery in an neurologically intact patient. Patient age and activity level are secondary considerations.

Question 99

A newborn is diagnosed with congenital vertical talus (CVT), also known as 'rocker-bottom foot.' Physical examination reveals a rigid foot with a prominent plantar convex deformity, dorsiflexion of the forefoot, and hindfoot equinus. What is the primary underlying anatomical abnormality in CVT, and what is the typical initial management approach?

Explanation

Congenital vertical talus (CVT) is characterized by a fixed dorsal dislocation of the navicular on the talar head, making the talus appear vertical. This leads to the characteristic 'rocker-bottom' foot deformity, with a rigid hindfoot equinus and forefoot dorsiflexion. The initial management typically involves a modified or 'reverse Ponseti' serial casting technique to gradually reduce the forefoot and stretch the contracted structures, followed by surgical intervention (often a one-stage release) to achieve full reduction of the talonavicular joint and maintain correction. The standard Ponseti method is for clubfoot (talipes equinovarus). Early surgical release is often required but casting usually precedes it to improve soft tissue conditions. Fixed equinus is part of it, but the talonavicular dislocation is key. Adduction and supination of the forefoot are characteristic of clubfoot, not CVT.

Question 100

A 70-year-old patient undergoes revision total hip arthroplasty (THA) for aseptic loosening of a cemented femoral stem. Intraoperatively, significant femoral bone loss is noted, corresponding to Paprosky Type 3B, with minimal intact host bone proximally and a wide diaphyseal canal. Which of the following femoral components is generally considered the most appropriate for reconstruction in this scenario?

Explanation

Paprosky Type 3B femoral bone loss signifies extensive proximal femoral bone loss, often extending below the lesser trochanter, with an enlarged diaphyseal canal and no significant metaphyseal bone for press-fit. In such cases, a modular extensively coated uncemented femoral stem with primary distal fixation (engaging cortical bone distally) is the most appropriate reconstructive option. These stems bypass the deficient proximal bone and achieve stable fixation in the healthier diaphyseal bone. Standard cemented or short-stem uncemented components rely on intact proximal bone which is absent. Impaction grafting is an option but for Type 3B it often requires specific expertise and can be challenging for significant defects. Calcar-replacing stems are for specific metaphyseal defects and typically require intact proximal bone.

Question 101

A 35-year-old professional football player presents with chronic, activity-related groin pain and stiffness, particularly with hip flexion and internal rotation. MRI reveals cam-type femoroacetabular impingement (FAI) and a labral tear at the anterior-superior acetabulum. Despite physiotherapy, symptoms persist, and he wishes to return to play. What is the primary goal of hip arthroscopy in this patient?

Explanation

The patient's symptoms and MRI findings are classic for femoroacetabular impingement (FAI) with an associated labral tear. The primary goal of hip arthroscopy for FAI is to correct the underlying bony abnormalities that cause impingement (reshaping the cam lesion on the femoral head-neck junction and/or resecting excessive acetabular rim bone for pincer-type impingement) and to address the associated labral pathology (repairing or debriding the torn labrum). This aims to restore normal hip mechanics, alleviate impingement, reduce pain, and prevent further cartilage damage, ultimately improving function and allowing return to sport. Loose body removal or debridement of generalized OA are not the primary goals for FAI. THA is for end-stage arthritis. Synovectomy is for inflammatory conditions.

Full Question & Answer Text (for Search Engines)

Question 1:

Options:

Percutaneous iliosacral screw fixation of the sacral fracture and anterior external fixator.
Open reduction and internal fixation of the sacral fracture via a posterior approach, combined with anterior plating of the pubic rami.
Transiliac internal fixator (Ganz clamp) and anterior external fixator.
Lumbopelvic fixation (spinopelvic instrumentation) extending from L4-S2 iliac combined with anterior external fixator.
Open reduction and internal fixation of the sacral fracture via a posterior approach with sacroiliac joint fusion.

Correct Answer: Lumbopelvic fixation (spinopelvic instrumentation) extending from L4-S2 iliac combined with anterior external fixator.

Explanation:

Question 2:

Options:

Decompressive laminectomy alone.
Steroids followed by radiation therapy only.
Posterior decompression and stabilization with short-segment instrumentation (T7-T9).
Posterior decompression, circumferential tumor resection via a single-stage posterior approach, and long-segment instrumentation (T6-T10).
Anterior corpectomy and reconstruction alone.

Correct Answer: Posterior decompression, circumferential tumor resection via a single-stage posterior approach, and long-segment instrumentation (T6-T10).

Explanation:

The patient has acute neurological deficit (motor weakness, urinary retention) due to spinal cord compression from a metastatic tumor, with a good prognosis (ECOG 2, >6 months survival). Decompressive laminectomy alone is largely considered inadequate for metastatic spine disease as it destabilizes the spine without providing sufficient decompression or tumor control and can lead to kyphosis and progressive instability. Steroids and radiation therapy are crucial but may be too slow for acute, severe neurological deficits, and radiation alone offers less robust local control for high-grade compressions. Posterior decompression and short-segment stabilization (C) might provide some stability but often fails to achieve wide enough decompression or adequate local control for aggressive tumors or those with significant anterior column involvement. Anterior corpectomy (E) addresses the anterior compression but is a separate surgery, and often requires a posterior stabilization in conjunction for optimal stability, and this option states 'alone'. The optimal strategy for a patient with severe spinal cord compression from metastatic cancer with good prognosis is **posterior decompression, circumferential tumor resection (vertebral column resection or total en bloc spondylectomy if feasible and indicated), and long-segment instrumentation.** This approach, often performed as a single-stage posterior surgery (separating posterior elements, corpectomy via a transpedicular or costotransversectomy approach, followed by reconstruction), offers the most comprehensive decompression, allows for the best chance of obtaining adequate surgical margins (local control), and provides robust immediate stability to prevent further neurological compromise and facilitate early mobilization and adjuvant therapies. Long-segment fixation (extending two levels above and two levels below the affected vertebral body) is generally preferred for metastatic disease to ensure durable stability and prevent construct failure.

Question 3:

Options:

Cemented standard femoral stem.
Uncemented extensively porous-coated stem.
Modular tapered fluted titanium stem.
Femoral head autograft reconstruction with a standard uncemented stem.
Allograft-prosthesis composite (APC).

Correct Answer: Modular tapered fluted titanium stem.

Explanation:

Paprosky type IIIB femoral bone loss indicates severe loss of metaphyseal and diaphyseal bone, making it challenging to achieve stable fixation with standard stems. A cemented standard femoral stem (A) would not provide adequate fixation in a compromised cement mantle and poor bone stock. An uncemented extensively porous-coated stem (B) relies on diaphyseal press-fit and bone ingrowth, which may be difficult to achieve reliably with severe bone loss, particularly if the diaphysis is not a good canal fit. Femoral head autograft (D) is generally not sufficient for type IIIB loss, which often requires structural support beyond what a simple graft can offer. An Allograft-prosthesis composite (E) is a viable and powerful option for severe bone loss (Type III and IV), often providing structural support and allowing for biological fixation; however, it has risks of infection, non-union, and resorption, and is typically reserved for even more severe cases (Type IV or failed Type IIIB where other options are not feasible). For Paprosky type IIIB, a **modular tapered fluted titanium stem** (C) is often the preferred choice. These stems achieve distal diaphyseal fixation, bypassing the proximal bone defect, and the modularity allows for restoration of leg length, offset, and version. The tapered, fluted design provides excellent rotational stability and press-fit fixation in the distal diaphysis, making it suitable for cases with significant proximal bone loss but an intact distal femoral canal.

Question 4:

Options:

Observation with bracing.
Growing rod implantation.
Anterior vertebral body tethering (AVBT).
Posterior spinal fusion with instrumentation from T2 to L5/S1.
Hemivertebra resection and fusion.

Correct Answer: Posterior spinal fusion with instrumentation from T2 to L5/S1.

Explanation:

The patient has a severe, rapidly progressing scoliosis (75 degrees) with significant functional impact (trunk imbalance, seating difficulties, respiratory compromise risk) in the setting of cerebral palsy. Her Risser 0 indicates significant remaining growth potential, but the severity of the curve and the underlying neurological condition make non-operative management (A) or growth-friendly strategies like growing rods (B) less ideal as definitive solutions. Growing rods are typically used for younger patients with significant growth remaining and less severe curves to delay definitive fusion, and a 75-degree curve at 12 with GMFCS III requires more immediate, robust correction. Anterior vertebral body tethering (C) is a growth modulation technique reserved for skeletally immature patients with idiopathic scoliosis, generally curves between 35-50 degrees, and is not suitable for severe neuromuscular scoliosis due to its limitations in correcting large, stiff curves and its dependency on continued growth. Hemivertebra resection (E) is for congenital scoliosis due to a hemivertebra, which is not described here. For a severe, progressive neuromuscular scoliosis in an adolescent with cerebral palsy, **posterior spinal fusion with instrumentation, typically extending from the upper thoracic spine to the pelvis (T2 to L5/S1),** (D) is the most appropriate definitive surgical intervention. This provides robust correction of the deformity, achieves permanent stability, improves seating balance, and prevents further progression and respiratory compromise. Fusion to the pelvis (L5/S1) is often necessary in neuromuscular scoliosis to prevent pelvic obliquity and ensure stable seating.

Question 5:

Options:

Immediate single-stage repair of all structures, including nerve, tendons, and bone graft for phalanx.
Delayed nerve repair (3-6 weeks) after initial wound debridement and tendon repair/bone fixation.
Staged reconstruction, initially debridement, tendon repair, and external fixation for bone, with nerve repair at a later stage.
Debridement, tendon repair, immediate bone grafting for the phalanx, and primary nerve repair.
Amputation of the small finger to optimize function of the remaining digits.

Correct Answer: Debridement, tendon repair, immediate bone grafting for the phalanx, and primary nerve repair.

Explanation:

This is a complex hand injury involving nerve, tendon, and bone. The goal of initial management is to achieve a stable, viable, and potentially functional hand. Debridement is always the first step in open injuries. Tendon repair (FDP) should generally be done primarily, if feasible, to optimize gliding and functional recovery. Bone loss of the proximal phalanx requires stabilization and restoration of length; immediate bone grafting (e.g., autograft) can be performed if soft tissue coverage is adequate and the wound is clean. Nerve repair (ulnar nerve): While traditionally delayed nerve repair was advocated, current evidence generally supports **primary nerve repair** for sharp, clean lacerations, especially in the context of other repairs, to maximize axon regeneration and functional recovery. There is no benefit to delaying nerve repair for 3-6 weeks unless the wound is contaminated or soft tissue is significantly compromised. Single-stage repair of all structures is often the ideal approach, assuming wound conditions permit. Option C suggests delayed nerve repair, which is less optimal for clean lacerations. Option E (amputation) is overly aggressive given the potential for functional salvage. Therefore, **debridement, tendon repair, immediate bone grafting for the phalanx, and primary nerve repair** (D) represents the most comprehensive and optimal initial surgical strategy aiming for best functional outcome.

Question 6:

Options:

Percutaneous plantar fascia release.
Exostectomy of the prominent plantar bone.
Midfoot arthrodesis with internal fixation.
Below-knee amputation.
Open reduction and internal fixation of individual fragmented bones.

Correct Answer: Midfoot arthrodesis with internal fixation.

Explanation:

The patient presents with advanced Charcot neuroarthropathy (rocker-bottom deformity, chronic plantar ulceration, radiographic changes) in the midfoot, refractory to conservative management. Percutaneous plantar fascia release (A) is for plantar fasciitis, not Charcot. Exostectomy of the prominent plantar bone (B) might relieve pressure and heal the ulcer temporarily, but it does not address the underlying instability and progressive deformity, often leading to recurrence of the ulcer or new ulcers. Below-knee amputation (D) is a last resort, usually reserved for unmanageable infection, severe intractable pain, or uncontrollable deformity despite reconstructive efforts, which is not indicated as the *most appropriate initial surgical intervention* here. Open reduction and internal fixation of individual fragmented bones (E) is generally not feasible or effective in Charcot foot due to severe osteopenia, bone fragmentation, and underlying neuropathy, which compromise fixation and healing. **Midfoot arthrodesis with internal fixation** (C) is the most appropriate surgical intervention for a stable, plantigrade foot in Charcot neuroarthropathy with rocker-bottom deformity and recurrent ulceration that has failed conservative care. This procedure aims to correct the deformity, stabilize the joints, and create a stable, fusable platform to redistribute plantar pressure and facilitate ulcer healing, thereby preserving the limb.

Question 7:

Options:

Immediate, single-stage repair of all torn ligaments within 24-48 hours.
Delayed, single-stage reconstruction of all torn ligaments at 3-6 weeks, allowing soft tissue swelling to subside.
Staged reconstruction, performing ACL/PCL reconstruction first, followed by PLC/LCL repair/reconstruction 6-8 weeks later.
Open primary repair of the PLC/LCL, followed by delayed arthroscopic ACL/PCL reconstruction.
Non-operative management with progressive rehabilitation given the high morbidity of surgery.

Correct Answer: Delayed, single-stage reconstruction of all torn ligaments at 3-6 weeks, allowing soft tissue swelling to subside.

Explanation:

This patient has a severe, multiligamentous knee injury (combined ACL, PCL, PLC, LCL). Non-operative management (E) is generally not recommended for such extensive injuries in athletes. Immediate repair (A) within 24-48 hours is largely discouraged due to significant swelling, stiffness, and increased risk of arthrofibrosis. Staged reconstruction (C) might be considered in very specific, complex cases, but generally increases morbidity, cost, and prolongs recovery without clear superiority. Open primary repair of the PLC/LCL followed by delayed ACL/PCL reconstruction (D) could be an option for isolated PLC avulsions or specific repairable tears, but it's not the overall best strategy for *all* ligaments in a high-energy multiligamentous injury. The current consensus for most multiligamentous knee injuries in athletes, especially high-grade combined injuries, is **delayed, single-stage reconstruction of all torn ligaments at 3-6 weeks (B),** after the acute inflammatory phase has subsided and soft tissue swelling has decreased. This timing minimizes the risk of arthrofibrosis, allows for better surgical exposure, and optimizes the chances of good postoperative range of motion and functional recovery. Repairable ligaments are typically repaired, while non-repairable ligaments are reconstructed.

Question 8:

Options:

Achieve a wide surgical margin (>2 cm of healthy tissue circumferentially).
Perform an intralesional resection to preserve as much bone as possible.
Use cryoablation or radiofrequency ablation to augment tumor kill at the surgical margins.
Administer additional intraoperative chemotherapy directly into the surgical bed.
Rely primarily on the efficacy of neoadjuvant chemotherapy to sterilize the tumor margins.

Correct Answer: Achieve a wide surgical margin (>2 cm of healthy tissue circumferentially).

Explanation:

For high-grade osteosarcoma, surgical resection with adequate margins is the cornerstone of local tumor control and significantly impacts patient survival. **Achieving a wide surgical margin** (>2 cm of healthy tissue circumferentially) (A) is paramount. A wide margin means removal of the tumor along with a cuff of normal surrounding tissue, ensuring that no microscopic tumor cells are left behind. This is the gold standard for oncologic resection of sarcomas. Intralesional resection (B) is contraindicated for high-grade sarcomas due to very high rates of local recurrence. Cryoablation or radiofrequency ablation (C) are adjunctive therapies but not substitutes for achieving a wide surgical margin in curative resections. Administering intraoperative chemotherapy (D) is not a standard or proven method for local tumor control in osteosarcoma. Relying primarily on neoadjuvant chemotherapy to sterilize margins (E) is incorrect; while chemotherapy improves tumor necrosis, it does not eliminate the need for a definitive surgical resection with wide margins.

Question 9:

A 60-year-old male with a history of open tibia fracture 5 years ago presents with a draining sinus tract and chronic pain at the fracture site. X-rays show sclerosis, cortical thickening, and a cloaca. MRI confirms chronic osteomyelitis with sequestrum formation. Cultures from the draining sinus have repeatedly grown *Pseudomonas aeruginosa*. After thorough debridement, what is the most appropriate next step in managing the infection and achieving bone union?

Options:

Long-term oral antibiotic therapy alone.
Local antibiotic delivery (e.g., antibiotic-loaded cement beads) followed by bone grafting.
Radical surgical debridement including removal of sequestrum, stabilization with external fixator, and systemic intravenous antibiotics.
Amputation due to refractory infection.
Hyperbaric oxygen therapy.

Correct Answer: Radical surgical debridement including removal of sequestrum, stabilization with external fixator, and systemic intravenous antibiotics.

Explanation:

The patient has chronic osteomyelitis with a draining sinus, sequestrum, and a difficult-to-treat organism (*Pseudomonas aeruginosa*). Long-term oral antibiotic therapy alone (A) is insufficient for chronic osteomyelitis with sequestrum. Local antibiotic delivery (B) is a good adjunct but *must* be accompanied by radical debridement; bone grafting before infection control is resolved will also fail. Amputation (D) is a last resort and not indicated here. Hyperbaric oxygen therapy (E) can be an adjunct but is not a primary treatment. The most appropriate and effective approach for chronic osteomyelitis with sequestrum is **radical surgical debridement**, which includes removal of all necrotic and infected bone (sequestrum), meticulous debridement of soft tissues, obliteration of dead space, followed by **stabilization** of the bone defect (often with an external fixator, especially if there's significant bone loss or instability), and a prolonged course of **systemic intravenous antibiotics** tailored to the cultured organism (C). This comprehensive approach aims to eradicate the infection, promote bone healing, and prevent recurrence.

Question 10:

Options:

Primary hyperparathyroidism; parathyroidectomy.
Osteoporosis; bisphosphonate therapy.
Renal osteodystrophy; phosphate binders and active vitamin D.
Oncogenic osteomalacia; tumor localization and resection.
Acquired osteomalacia due to malabsorption; high-dose vitamin D and calcium supplementation.

Correct Answer: Acquired osteomalacia due to malabsorption; high-dose vitamin D and calcium supplementation.

Explanation:

The patient's clinical presentation (diffuse bone pain, muscle weakness, stress fractures) and lab findings (hypocalcemia, hypophosphatemia, elevated PTH, elevated alkaline phosphatase, low 25-hydroxyvitamin D) are classic for osteomalacia. The history of gastrectomy and prolonged PPI use strongly suggests malabsorption. Primary hyperparathyroidism (A) would typically present with hypercalcemia. Osteoporosis (B) would not typically cause hypophosphatemia or such elevated alkaline phosphatase. Renal osteodystrophy (C) would show kidney dysfunction, and the primary cause here points to the gut. Oncogenic osteomalacia (D) typically presents with isolated hypophosphatemia but normal calcium and PTH. Therefore, the most likely diagnosis is **acquired osteomalacia due to malabsorption**, and the primary treatment target is to correct the vitamin D deficiency and calcium balance (E). This involves high-dose vitamin D supplementation (often calciferol followed by cholecalciferol) and calcium supplementation to address the malabsorption caused by gastrectomy and PPI use.

Question 11:

Options:

Posterior decompression (laminectomy) and short-segment pedicle screw fixation (T11-L1).
Anterior corpectomy, decompression, and reconstruction with strut graft.
Posterior reduction, decompression via transpedicular or costotransversectomy approach, and long-segment pedicle screw fixation (T10-L2).
Non-operative management with brace and close neurological monitoring.
Immediate anterior and posterior combined approach for complete decompression and stabilization.

Correct Answer: Posterior reduction, decompression via transpedicular or costotransversectomy approach, and long-segment pedicle screw fixation (T10-L2).

Explanation:

The patient has a T12 burst fracture with significant canal compromise and a neurological deficit (ASIA D). Non-operative management (D) is inappropriate. Posterior laminectomy alone (A) is generally contraindicated for burst fractures, especially with neurological deficits, as it can worsen kyphosis and instability without effectively decompressing anteriorly displaced fragments. Anterior corpectomy and reconstruction (B) effectively decompresses the cord and reconstructs the anterior column, but it may not be sufficient for severe posterior element injuries or provide enough stability alone. Immediate anterior and posterior combined approach (E) is very aggressive and reserved for highly unstable or complex deformities. The most appropriate strategy, which allows for robust decompression and stabilization from a single approach, is **posterior reduction, decompression via a transpedicular or costotransversectomy approach, and long-segment pedicle screw fixation (T10-L2)** (C). This approach allows for indirect and often direct decompression of the spinal canal, provides excellent stabilization, corrects kyphosis, and minimizes morbidity compared to combined approaches. Long-segment fixation (typically two levels above and two below) is generally preferred for burst fractures with neurological deficit to ensure adequate stability and load sharing.

Question 12:

Options:

Arthroscopic Bankart repair with remplissage.
Open anterior capsular shift.
Latarjet procedure.
Arthroscopic repair with glenoid bone block augmentation from the iliac crest.
Rotator interval closure.

Correct Answer: Latarjet procedure.

Explanation:

This patient has recurrent anterior shoulder instability in a high-demand athlete with significant glenoid bone loss (>25%) and a large Hill-Sachs lesion (bipolar bone loss). Arthroscopic Bankart repair with remplissage (A) is suitable for a Bankart lesion with a large Hill-Sachs but without significant glenoid bone loss; with >25% glenoid bone loss, it has a very high failure rate. Open anterior capsular shift (B) addresses capsular laxity but not bone deficiencies. Arthroscopic repair with glenoid bone block augmentation from the iliac crest (D) is viable, but the Latarjet procedure is often preferred for high-demand overhead athletes with significant bone loss due to its dynamic stabilization effect. Rotator interval closure (E) is insufficient for such a complex injury. The **Latarjet procedure (C)** is the most appropriate surgical intervention in this scenario. It addresses the glenoid bone loss by transferring the coracoid process with its attached conjoined tendon to the anterior-inferior glenoid. This procedure increases the glenoid arc, provides a bony block to anterior translation, and the conjoined tendon acts as a 'sling' (dynamic stabilization) that tightens with abduction and external rotation, preventing anterior dislocation. It is particularly effective in high-demand athletes with significant bone loss and has lower recurrence rates compared to isolated soft tissue repairs.

Question 13:

Options:

Open reduction and internal fixation (ORIF) with plates and screws, retaining the existing stem.
Revision to a long, extensively porous-coated femoral stem.
Revision to a modular tapered fluted stem, bypassing the fracture site.
Revision to a cemented stem with cerclage wires.
Non-operative management with protected weight-bearing.

Correct Answer: Revision to a modular tapered fluted stem, bypassing the fracture site.

Explanation:

A Vancouver B2 periprosthetic femoral fracture is defined as a fracture around a *loose* femoral stem. Although the prompt mentions the stem 'shows no signs of loosening on radiographs and appears stable', the classification of B2 takes precedence, indicating the stem is compromised and requires revision. For a Vancouver B2 fracture, the existing loose stem must be revised, and the fracture needs stabilization. ORIF (A) retaining the existing stem is for Vancouver B1 fractures (well-fixed stem). Revision to a long, extensively porous-coated femoral stem (B) could be an option if distal fixation is assured, but may not adequately bypass the fracture. Revision to a cemented stem with cerclage wires (D) is less common as a primary revision strategy for B2 fractures with bone loss. Non-operative management (E) is not for unstable periprosthetic fractures. Therefore, **revision to a modular tapered fluted stem, bypassing the fracture site (C)** is generally the preferred choice for Vancouver B2 fractures. These stems achieve stable distal fixation in healthy bone beyond the fracture, and their modularity allows for appropriate restoration of limb length, offset, and version, providing a robust solution for a loose stem with associated fracture.

Question 14:

Options:

Associated fibrous dysplasia of the tibia.
Underlying neurofibromatosis type 1 (NF1).
Inadequate initial immobilization techniques.
Poor vascularity of the fracture site.
Parental non-compliance with treatment protocols.

Correct Answer: Underlying neurofibromatosis type 1 (NF1).

Explanation:

Congenital pseudarthrosis of the tibia (CPT) is one of the most challenging orthopedic conditions. While CPT is often associated with localized abnormal tissue, the most critical underlying factor for its high failure rate and difficult management is its strong association with **Neurofibromatosis type 1 (NF1)** (B). Approximately 50-90% of CPT cases are associated with NF1. The pathophysiology of CPT in NF1 is thought to involve aberrant osteoclast activation and abnormal mesenchymal tissue surrounding the pseudarthrosis, which inhibits normal bone healing. This underlying biological defect, rather than just poor vascularity (D), makes healing extremely difficult and prone to recurrence. Fibrous dysplasia (A) is not the primary or most critical underlying factor influencing CPT failure rates; NF1 is the major association. Inadequate initial immobilization (C) can contribute to failure, but the inherent biological problem of CPT, particularly with NF1, makes it prone to failure even with excellent immobilization. Parental non-compliance (E) is a general factor but not the *most critical factor influencing the high failure rate* of CPT *itself*.

Question 15:

Options:

Arthroscopic TFCC debridement.
Open repair of the TFCC foveal attachment.
Ulnar shortening osteotomy.
Lunotriquetral (LT) ligament reconstruction.
Four-corner arthrodesis.

Correct Answer: Open repair of the TFCC foveal attachment.

Explanation:

The patient presents with chronic ulnar-sided wrist pain, clicking, and weakness, along with objective findings of a complete tear of the TFCC central and foveal attachments, a positive drive-through test, and tenderness over the triquetrum. This points to significant ulnar-sided wrist instability. While 'dynamic scapholunate dissociation' is also mentioned, the primary symptoms and the explicit complete TFCC tear are the most direct targets for intervention, especially as there is no specific scapholunate (SL) repair option provided. Arthroscopic TFCC debridement (A) is insufficient for a complete foveal tear. Ulnar shortening osteotomy (C) is for ulnar positive variance or impaction. LT ligament reconstruction (D) is for lunotriquetral instability, which might be a secondary issue, but the TFCC tear is a more primary structural disruption for ulnar-sided stability. Four-corner arthrodesis (E) is a salvage procedure for advanced arthritis. For a complete tear of the TFCC foveal attachment, which is critical for distal radioulnar joint and ulnar carpal stability, **open repair of the TFCC foveal attachment (B)** is the most appropriate procedure to restore stability and provide lasting relief from ulnar-sided wrist pain and mechanical symptoms. This directly addresses the main structural lesion causing instability on the ulnar side.

Question 16:

Options:

Arthroscopic labral debridement and acetabular rim trimming.
Open surgical dislocation of the hip, labral repair, acetabular rim osteoplasty, and femoral osteoplasty.
Arthroscopic labral repair, acetabular rim trimming, and femoral osteoplasty.
Periacetabular osteotomy (PAO).
Hip arthrodesis.

Correct Answer: Arthroscopic labral repair, acetabular rim trimming, and femoral osteoplasty.

Explanation:

The patient has pincer-type FAI with labral ossification and early chondral delamination, failing conservative treatment. This requires surgical intervention. Arthroscopic labral debridement and acetabular rim trimming (A) might relieve symptoms, but labral repair is generally preferred over debridement, especially with focal ossification indicating chronic pathology. Open surgical dislocation (B) is a robust approach but more invasive with higher morbidity, usually reserved for complex deformities or failed arthroscopic cases. Periacetabular osteotomy (D) is for acetabular dysplasia, not FAI. Hip arthrodesis (E) is a salvage procedure for severe arthritis. For pincer FAI with labral pathology, the goal is to resect the over-covered acetabular rim (rim trimming), and repair or reconstruct the labrum. While the question explicitly states 'pincer-type FAI', many patients have mixed FAI components, thus addressing femoral-sided impingement with femoral osteoplasty is often prudent for a comprehensive treatment. **Arthroscopic labral repair, acetabular rim trimming, and femoral osteoplasty (C)** is the most appropriate and common contemporary surgical approach. It offers the advantages of minimally invasive surgery while allowing for comprehensive treatment of the pathology: addressing the pincer lesion (rim trimming), dealing with the labral injury (repair is preferred for durability), and correcting any subtle cam component on the femoral side if also contributing to impingement, leading to durable symptomatic relief.

Question 17:

Options:

High tibial osteotomy (HTO).
Lateral unicondylar knee arthroplasty (UKA).
Total knee arthroplasty (TKA).
Allograft meniscal transplantation.
Arthroscopic debridement.

Correct Answer: Allograft meniscal transplantation.

Explanation:

The patient is a young, active professional athlete with a history of total meniscectomy, experiencing pain and early degenerative changes without advanced arthritis (no bone-on-bone). He wishes to prolong his career. High tibial osteotomy (A) is typically for unicompartmental osteoarthritis with varus malalignment, aiming to offload the medial compartment, which is not the primary issue here. Lateral unicondylar knee arthroplasty (B) and Total knee arthroplasty (C) are for more advanced, symptomatic arthritis and would end his professional athletic career. Arthroscopic debridement (E) is palliative and unlikely to provide lasting relief. **Allograft meniscal transplantation (D)** is the most appropriate option. It is indicated in young, active patients with symptomatic meniscal deficiency (prior total meniscectomy), intact articular cartilage (or only early changes), stable ligaments, and proper limb alignment. The goal is to restore the meniscal function (load transmission, shock absorption, joint stability), reduce pain, and potentially delay the progression of osteoarthritis, thereby allowing the patient to continue high-level activities.

Question 18:

Options:

Immediate open reduction and internal fixation (ORIF) of the articular surface and plating of the metaphysis.
Delayed ORIF at 10-14 days after further soft tissue recovery.
Medial malleolar osteotomy to improve articular visualization.
Staged approach: limited internal fixation of the articular fragments, followed by definitive plating after several weeks.
Below-knee amputation due to the severity of the injury.

Correct Answer: Staged approach: limited internal fixation of the articular fragments, followed by definitive plating after several weeks.

Explanation:

This patient has a high-energy pilon fracture, compounded by significant soft tissue injury (blistering, Gustilo Type I open wound). The initial management (debridement, external fixation, antibiotics) is correct. The improving soft tissue conditions on day 3, with the open wound still requiring closure, indicates a need for careful timing. Immediate ORIF (A) is generally contraindicated in pilon fractures with severe soft tissue compromise due to high risks of wound breakdown and infection. Delayed ORIF at 10-14 days (B) is common for closed pilon fractures, but for an open fracture with significant articular comminution, a staged approach is safer. Medial malleolar osteotomy (C) is an adjunct, not the main strategy. Below-knee amputation (E) is a last resort. The most appropriate strategy is a **staged approach (D)**. This typically involves an initial stage (already performed) of debridement and external fixation. The next step, often within 3-7 days when soft tissues improve, is a limited internal fixation of the articular fragments only (to restore the joint surface) followed by wound closure. Definitive plating of the metaphysis is then performed after 2-3 weeks, once the soft tissue envelope has fully recovered. This sequential approach minimizes soft tissue complications and optimizes the chances of a good outcome.

Question 19:

Which of the following statements regarding the biological response and mechanical properties of orthopedic implants is most accurate?

Options:

Cobalt-chromium alloys are primarily chosen for their excellent osseointegration properties.
Ultra-high molecular weight polyethylene (UHMWPE) wear particles typically induce an osteolytic response leading to aseptic loosening.
Titanium alloys possess a higher Young's modulus compared to stainless steel, making them stiffer and less prone to elastic deformation.
Bone cement (PMMA) acts primarily as a biological adhesive, promoting bone ingrowth into the implant.
Hydroxyapatite coatings on metallic implants primarily function by increasing the coefficient of friction for immediate mechanical stability.

Correct Answer: Ultra-high molecular weight polyethylene (UHMWPE) wear particles typically induce an osteolytic response leading to aseptic loosening.

Explanation:

A. Cobalt-chromium alloys are chosen primarily for their high strength, hardness, and corrosion resistance, not for osseointegration (which is a property of titanium). B. **UHMWPE wear particles** are a major cause of aseptic loosening in arthroplasty. These particles elicit an inflammatory response in periprosthetic tissues, leading to a cascade of events that includes osteoclast activation and subsequent periprosthetic osteolysis, causing the implant to loosen. C. Titanium alloys have a *lower* Young's modulus (closer to bone) compared to stainless steel, making them more flexible and less prone to stress shielding. D. Bone cement (PMMA) functions as a *mechanical interlock*, providing immediate fixation by filling spaces; it does not promote biological bone ingrowth. E. Hydroxyapatite (HA) coatings promote *osseointegration* by providing a bioactive surface that encourages bone apposition and ingrowth for biological fixation. They do not primarily increase the coefficient of friction for immediate mechanical stability.

Question 20:

Options:

Anterior cervical decompression and fusion (ACDF) at C1-C2.
Posterior decompression (laminectomy of C1) and occipitocervical fusion.
Posterior atlantoaxial fusion (C1-C2) using C1 lateral mass and C2 pedicle screws.
Non-operative management with a cervical collar and close neurological monitoring.
Transoral odontoidectomy alone.

Correct Answer: Posterior atlantoaxial fusion (C1-C2) using C1 lateral mass and C2 pedicle screws.

Explanation:

The patient has symptomatic atlantoaxial instability (AAI) with spinal cord compression (spastic quadriparesis, hyperreflexia, gait disturbance) in the setting of severe rheumatoid arthritis. Non-operative management (D) is contraindicated due to progressive neurological deficits. Anterior cervical decompression and fusion (A) is generally not indicated for C1-C2 instability. Posterior decompression (laminectomy of C1) and occipitocervical fusion (B) is a robust option, especially for irreducible AAI or basilar invagination, but it sacrifices C0-C1 motion. Transoral odontoidectomy alone (E) provides decompression but no stability and typically requires a posterior fusion. The most appropriate and often preferred surgical management for symptomatic reducible atlantoaxial instability in RA is **posterior atlantoaxial fusion (C1-C2) using C1 lateral mass and C2 pedicle screws (C)**. This technique provides rigid fixation and stability at the C1-C2 segment, preserves motion at C0-C1 (occiput-C1), and effectively decompresses the spinal cord by reducing the subluxation. Although osteopenia in RA can make screw fixation challenging, modern techniques usually allow for successful instrumentation. If subluxation is irreducible or there's severe bone loss/basilar invagination, occipitocervical fusion might be considered, but C1-C2 fusion is preferred for isolated, reducible AAI.

Question 21:

Options:

Anterior plating of the pubic symphysis alone.
Percutaneous iliosacral screw fixation of one SI joint.
External fixation of the pelvis.
Combined anterior plating of the pubic symphysis and bilateral posterior sacral/iliac fixation.
Posterior tension band wiring of the pubic symphysis and unilateral SI screw.

Correct Answer: Combined anterior plating of the pubic symphysis and bilateral posterior sacral/iliac fixation.

Explanation:

Question 22:

Options:

Observation and bracing.
Posterior spinal fusion and instrumentation from T10 to L2.
Anterior decompression and fusion at T12.
Vertebroplasty at T12.
Short-segment posterior instrumentation without decompression.

Correct Answer: Posterior spinal fusion and instrumentation from T10 to L2.

Explanation:

Question 23:

Options:

Component malposition; revision of the acetabular component.
Impacting trochanteric osteotomy.
Soft tissue imbalance/insufficiency; surgical exploration with potential capsular repair and/or head-neck length adjustment.
Periprosthetic infection; aspiration and culture.
Increased offset stem revision.

Correct Answer: Soft tissue imbalance/insufficiency; surgical exploration with potential capsular repair and/or head-neck length adjustment.

Explanation:

Question 24:

Options:

Patellar fracture; non-operative management with extension brace.
Periprosthetic knee infection; joint aspiration and IV antibiotics.
Quadriceps tendon rupture; surgical repair.
Extensor lag due to quadriceps weakness; physiotherapy.
Patellar component loosening; revision TKA.

Correct Answer: Quadriceps tendon rupture; surgical repair.

Explanation:

Question 25:

Options:

Revision arthroscopic capsulolabral repair.
Bankart repair with remplissage.
Latarjet procedure.
Superior capsular reconstruction.
Arthroscopic glenoid augmentation with allograft.

Correct Answer: Latarjet procedure.

Explanation:

Question 26:

Options:

Excision of the coronoid fragment.
Non-operative management with early mobilization.
Fixation of the coronoid fragment.
Radial head replacement alone.
Hinge external fixator application without coronoid fixation.

Correct Answer: Fixation of the coronoid fragment.

Explanation:

Question 27:

Options:

Excision of the proximal pole of the scaphoid.
Dorsal screw fixation of the nonunion.
Vascularized bone graft with internal fixation.
Scaphoid replacement arthroplasty.
Proximal row carpectomy.

Correct Answer: Vascularized bone graft with internal fixation.

Explanation:

Question 28:

Options:

Continued bracing and observation.
Vertebroplasty of the affected vertebrae.
Surgical correction with posterior spinal fusion and instrumentation.
Anterior osteotomy alone.
Physical therapy focusing on extension exercises.

Correct Answer: Surgical correction with posterior spinal fusion and instrumentation.

Explanation:

Question 29:

Options:

Wide surgical resection and reconstruction.
Radiation therapy alone.
Chemotherapy followed by local control (surgery +/- radiation).
Amputation.
Observation with serial imaging.

Correct Answer: Chemotherapy followed by local control (surgery +/- radiation).

Explanation:

Question 30:

Options:

Debridement and chronic antibiotic suppression.
Sequestrectomy and local antibiotic bead placement.
Segmental resection of the infected bone, debridement, and bone transport using an Ilizarov frame.
Amputation below the knee.
Open wound care with daily dressings.

Correct Answer: Segmental resection of the infected bone, debridement, and bone transport using an Ilizarov frame.

Explanation:

Question 31:

Options:

Eichenholtz Stage 0; pain relief.
Eichenholtz Stage 1 (Acute/Development); immobilization.
Eichenholtz Stage 2 (Coalescence); offloading.
Eichenholtz Stage 3 (Reconstruction/Consolidation); correction of deformity and stabilization.
Eichenholtz Stage 4 (Reactivation); antibiotic therapy.

Correct Answer: Eichenholtz Stage 3 (Reconstruction/Consolidation); correction of deformity and stabilization.

Explanation:

Question 32:

Options:

Peripheral neuropathy; nerve conduction studies.
Cervical myelopathy due to atlantoaxial subluxation; MRI of the cervical spine.
Carpal tunnel syndrome; EMG.
Rheumatoid vasculitis; biopsy of affected tissue.
Anterior cord syndrome; spinal angiography.

Correct Answer: Cervical myelopathy due to atlantoaxial subluxation; MRI of the cervical spine.

Explanation:

Question 33:

Options:

Isolated ACL reconstruction.
Isolated PCL reconstruction.
Combined ACL/PCL reconstruction.
Reconstruction of the posterolateral corner (PLC) with or without other ligamentous reconstructions depending on full assessment.
High tibial osteotomy.

Correct Answer: Reconstruction of the posterolateral corner (PLC) with or without other ligamentous reconstructions depending on full assessment.

Explanation:

Question 34:

Options:

MRI of the lower leg.
Plain radiographs of the tibia.
Intracompartmental pressure measurement during exercise.
Nerve conduction studies.
Arteriography of the lower leg.

Correct Answer: Intracompartmental pressure measurement during exercise.

Explanation:

Question 35:

Options:

Total hip arthroplasty (THA).
Core decompression with bone grafting.
Intertrochanteric osteotomy.
Hemiarthroplasty.
Resurfacing arthroplasty.

Correct Answer: Core decompression with bone grafting.

Explanation:

Question 36:

Options:

Observation and bracing.
Growth-friendly instrumentation (e.g., growing rods).
Hemivertebrectomy with posterior fusion and instrumentation.
Anterior vertebral body tethering (VBT).
Posterior instrumentation without resection.

Correct Answer: Hemivertebrectomy with posterior fusion and instrumentation.

Explanation:

Question 37:

Options:

Diabetic osteoarthropathy.
Gout.
Rheumatoid arthritis.
Secondary hyperparathyroidism with osteitis fibrosa cystica.
Psoriatic arthritis.

Correct Answer: Secondary hyperparathyroidism with osteitis fibrosa cystica.

Explanation:

Question 38:

Options:

In situ ulnar nerve decompression.
Medial epicondylectomy.
Anterior subcutaneous ulnar nerve transposition.
Anterior submuscular ulnar nerve transposition.
Posterior ulnar nerve transposition.

Correct Answer: Anterior submuscular ulnar nerve transposition.

Explanation:

Question 39:

Options:

Stage I; Tenosynovectomy of posterior tibial tendon.
Stage II; FDL transfer to navicular + calcaneal osteotomy.
Stage III; Triple arthrodesis.
Stage IV; Isolated subtalar arthrodesis.
Stage II; Lateral column lengthening.

Correct Answer: Stage III; Triple arthrodesis.

Explanation:

Question 40:

Options:

Immediate definitive open reduction and internal fixation (ORIF).
Continued external fixation for 6-8 weeks.
Limited open reduction and internal fixation with a medial plate.
Percutaneous screw fixation alone.
External fixation removal and cast application.

Correct Answer: Immediate definitive open reduction and internal fixation (ORIF).

Explanation:

Question 41:

Options:

Ilioinguinal approach
Kocher-Langenbeck approach
Modified Stoppa approach
Extended iliofemoral approach
Trochanteric flip osteotomy approach

Correct Answer: Kocher-Langenbeck approach

Explanation:

Question 42:

Options:

Isolated decompression of neural elements
Short-segment fusion and instrumentation
Restoration of sagittal balance with long-segment fusion
Anterior column support without posterior fusion
Posterior column osteotomy alone

Correct Answer: Restoration of sagittal balance with long-segment fusion

Explanation:

Question 43:

Options:

C-reactive protein (CRP) > 10 mg/L
Erythrocyte sedimentation rate (ESR) > 30 mm/hr
Single positive culture of a virulent organism
Synovial fluid leukocyte count > 3,000 cells/µL
Presence of a sinus tract communicating with the prosthesis

Correct Answer: Presence of a sinus tract communicating with the prosthesis

Explanation:

Question 44:

Options:

Percutaneous in situ pinning without reduction
Gentle closed reduction followed by in situ pinning
Open reduction with surgical dislocation and pinning
Spica casting without surgery
Traction followed by delayed pinning

Correct Answer: Open reduction with surgical dislocation and pinning

Explanation:

Question 45:

Options:

Immediate wide en bloc resection
Neo-adjuvant chemotherapy
Adjuvant radiotherapy
Amputation without further staging
Observation with serial imaging

Correct Answer: Neo-adjuvant chemotherapy

Explanation:

Question 46:

Options:

Within 24-48 hours
At 3-6 weeks post-injury
At 3-6 months post-injury
At 9-12 months post-injury
After 18 months post-injury

Correct Answer: At 3-6 months post-injury

Explanation:

Question 47:

Options:

Immediate surgical fusion
Aggressive intravenous antibiotics
Non-weight bearing and total contact casting
Corticosteroid injection into the affected joints
Amputation of the affected limb

Correct Answer: Non-weight bearing and total contact casting

Explanation:

Question 48:

Options:

Staged reconstruction with initial PCL and medial-sided repair/reconstruction, followed by delayed ACL
Acute, single-stage reconstruction of all torn ligaments
Acute repair of all torn ligaments without reconstruction
Initial immobilization in extension followed by gradual rehabilitation
Arthroscopic débridement and observation

Correct Answer: Acute, single-stage reconstruction of all torn ligaments

Explanation:

Question 49:

Options:

Debridement, antibiotics, and implant retention (DAIR)
Single-stage revision arthroplasty
Two-stage revision arthroplasty
Arthrodesis
Amputation

Correct Answer: Two-stage revision arthroplasty

Explanation:

Question 50:

Options:

Elevated alkaline phosphatase alone
Involvement of weight-bearing bones (e.g., tibia)
Asymptomatic skull involvement
Anticipated surgery in an affected bone
Normal hearing

Correct Answer: Anticipated surgery in an affected bone

Explanation:

Question 51:

Options:

Femoral nerve
Sciatic nerve
Obturator nerve
Superior gluteal nerve
Inferior gluteal nerve

Correct Answer: Sciatic nerve

Explanation:

Question 52:

Options:

Presence of spondylolisthesis
Presence of scoliosis
Persistent debilitating symptoms despite adequate conservative therapy
Motor weakness >3/5
Bladder and bowel dysfunction

Correct Answer: Persistent debilitating symptoms despite adequate conservative therapy

Explanation:

Question 53:

Options:

Type A
Type B1
Type B2
Type B3
Type C

Correct Answer: Type C

Explanation:

Question 54:

Options:

Observation and serial radiographs
Brace treatment (TLSO)
Posterior spinal fusion
Anterior vertebral body tethering
Physical therapy and core strengthening

Correct Answer: Posterior spinal fusion

Explanation:

Question 55:

Options:

Extensive wide en bloc resection and reconstruction
Percutaneous cement augmentation (vertebroplasty/kyphoplasty-like for long bone)
Intramedullary nailing for stabilization
External fixation
Radiation therapy alone

Correct Answer: Intramedullary nailing for stabilization

Explanation:

Question 56:

Options:

Scapholunate ligament repair (direct repair)
Scaphoid excision and four-corner fusion
SLAC wrist reconstruction (proximal row carpectomy)
Ligament reconstruction using a tendon graft (e.g., Blatt capsulodesis, modified Brunelli)
Wrist arthrodesis

Correct Answer: Ligament reconstruction using a tendon graft (e.g., Blatt capsulodesis, modified Brunelli)

Explanation:

Question 57:

Options:

Stage I, tenosynovectomy
Stage II, combined tendon transfer and osteotomies
Stage III, triple arthrodesis
Stage IV, pantalar arthrodesis
Early Charcot arthropathy, total contact casting

Correct Answer: Stage II, combined tendon transfer and osteotomies

Explanation:

Question 58:

Options:

Arthroscopic debridement and lavage
Microfracture
Osteochondral autograft transfer system (OATS)
Autologous Chondrocyte Implantation (ACI) or Matrix-Induced Autologous Chondrocyte Implantation (MACI)
Total knee arthroplasty

Correct Answer: Autologous Chondrocyte Implantation (ACI) or Matrix-Induced Autologous Chondrocyte Implantation (MACI)

Explanation:

Question 59:

Options:

Type I, irrigation and debridement within 24 hours
Type II, irrigation and debridement within 12 hours
Type IIIA, irrigation and debridement, followed by internal fixation
Type IIIB, irrigation and debridement, with plans for soft tissue coverage
Type IIIC, immediate amputation

Correct Answer: Type IIIB, irrigation and debridement, with plans for soft tissue coverage

Explanation:

Question 60:

Options:

MRI of the lower leg
CT scan of the lower leg
Resting compartment pressures
Post-exercise compartment pressures
Electromyography (EMG)

Correct Answer: Post-exercise compartment pressures

Explanation:

Question 61:

Options:

Percutaneous screw fixation of the acetabular fracture immediately.
Closed reduction with traction followed by conservative management.
Open reduction and internal fixation (ORIF) of the acetabular fracture via a Kocher-Langenbeck approach with extraction of the incarcerated fragment.
Open reduction and internal fixation (ORIF) of the acetabular fracture via an ilioinguinal approach.
Limited arthroscopic debridement of the incarcerated fragment and continued traction.

Correct Answer: Open reduction and internal fixation (ORIF) of the acetabular fracture via a Kocher-Langenbeck approach with extraction of the incarcerated fragment.

Explanation:

Question 62:

Options:

Initiate high-dose intravenous corticosteroids.
Emergent surgical decompression (laminectomy).
Immediate commencement of palliative radiation therapy.
Administer opioid analgesics and observe.
Order a CT-guided biopsy of the lesion.

Correct Answer: Initiate high-dose intravenous corticosteroids.

Explanation:

Question 63:

Options:

Debridement, antibiotics, and implant retention (DAIR).
One-stage revision arthroplasty with cement spacers.
Two-stage revision arthroplasty.
Long-term suppressive oral antibiotics.
Knee arthrodesis.

Correct Answer: Two-stage revision arthroplasty.

Explanation:

Question 64:

Options:

Anterior spinal fusion with instrumentation.
Posterior spinal fusion with pedicle screw instrumentation.
Vertebral body tethering (VBT).
Anterior and posterior combined fusion.
Observation with serial radiographs and pulmonary function tests.

Correct Answer: Posterior spinal fusion with pedicle screw instrumentation.

Explanation:

Question 65:

Options:

Immediately, within 6-8 hours of injury to prevent stiffening.
Within 24-48 hours, after initial swelling reduction.
After the soft tissue envelope has recovered, typically 7-14 days post-injury, when skin wrinkles are present.
Only after the external fixator has been removed and partial weight-bearing has started.
Never, as external fixation is usually the definitive treatment for severe pilon fractures.

Correct Answer: After the soft tissue envelope has recovered, typically 7-14 days post-injury, when skin wrinkles are present.

Explanation:

Question 66:

Options:

Removal of the existing hardware only.
Aggressive debridement of all necrotic bone (sequestrum) and infected soft tissues.
Long-term oral antibiotic therapy for several months.
Bone grafting of the defect immediately after hardware removal.
Placement of an external fixator for stability.

Correct Answer: Aggressive debridement of all necrotic bone (sequestrum) and infected soft tissues.

Explanation:

Question 67:

Options:

Decompression of neural elements only.
Correction of coronal plane deformity (scoliosis) only.
Restoration of sagittal balance and achieving a neutral or slightly negative SVA.
Placement of a short-segment fusion to stabilize the most painful levels.
Prevention of further curve progression.

Correct Answer: Restoration of sagittal balance and achieving a neutral or slightly negative SVA.

Explanation:

Question 68:

Options:

Open reduction and internal fixation (ORIF) with plates and screws around the existing stem.
Revision total hip arthroplasty with a longer, often calcar-loaded, cementless stem.
Non-weight-bearing and observation, as the stem is well-fixed.
Placement of cerclage wires alone to stabilize the fracture.
Girdlestone resection arthroplasty.

Correct Answer: Revision total hip arthroplasty with a longer, often calcar-loaded, cementless stem.

Explanation:

Question 69:

Options:

Neurolysis of the avulsed nerve roots.
Direct end-to-end repair of the avulsed nerve roots.
Nerve grafting using sural nerve autograft to bridge the gap.
Nerve transfers (e.g., intercostal nerves, accessory nerve) to restore shoulder and elbow function.
Immediate shoulder arthrodesis for stability.

Correct Answer: Nerve transfers (e.g., intercostal nerves, accessory nerve) to restore shoulder and elbow function.

Explanation:

Question 70:

Options:

Continue bisphosphonate therapy to prevent further fractures.
Initiate immediate high-dose calcium and Vitamin D supplementation.
Discontinue bisphosphonate therapy.
Weight-bearing as tolerated to stimulate bone healing.
Referral for genetic testing for bone fragility.

Correct Answer: Discontinue bisphosphonate therapy.

Explanation:

Question 71:

Options:

Isolated medial patellofemoral ligament (MPFL) reconstruction.
Lateral retinacular release alone.
Tibial tubercle osteotomy (e.g., Elmslie-Trillat or Fulkerson) with MPFL reconstruction.
Patellectomy.
Femoral osteotomy to correct rotational alignment.

Correct Answer: Tibial tubercle osteotomy (e.g., Elmslie-Trillat or Fulkerson) with MPFL reconstruction.

Explanation:

Question 72:

Options:

Immediate amputation to prevent further progression.
Arthrodesis with correction of the deformity and stabilization.
Long-term non-weight-bearing in a total contact cast.
Debridement of the ulceration and local wound care only.
Prophylactic internal fixation before deformity develops.

Correct Answer: Arthrodesis with correction of the deformity and stabilization.

Explanation:

Question 73:

Options:

Scapholunate ligament repair.
Four-corner fusion (scaphoid excision and fusion of capitate, hamate, lunate, triquetrum).
Proximal row carpectomy.
Total wrist arthrodesis.
Radial styloidectomy.

Correct Answer: Four-corner fusion (scaphoid excision and fusion of capitate, hamate, lunate, triquetrum).

Explanation:

Question 74:

Options:

Immediate closed reduction and percutaneous pinning.
Order a CT angiogram to assess vascular compromise.
Observation with elevation and analgesia, reassessing pulses and neurological status.
Emergency open reduction and internal fixation with vascular exploration.
Initiate a diagnostic elbow arthrogram.

Correct Answer: Emergency open reduction and internal fixation with vascular exploration.

Explanation:

Question 75:

Options:

The choice of endoprosthesis (e.g., modular vs. custom).
Achieving negative microscopic surgical margins (R0 resection).
The patient's return to high-impact sports.
The duration of adjuvant chemotherapy.
The type of physical therapy rehabilitation program.

Correct Answer: Achieving negative microscopic surgical margins (R0 resection).

Explanation:

Question 76:

Options:

Botox injection into the scalene muscles.
Surgical decompression of the thoracic outlet (e.g., first rib resection).
Physical therapy focusing on posture, shoulder girdle strengthening, and nerve gliding exercises.
Referral for diagnostic angiography.
Prescription of strong opioid analgesics.

Correct Answer: Physical therapy focusing on posture, shoulder girdle strengthening, and nerve gliding exercises.

Explanation:

Question 77:

Options:

Inadequate post-operative rehabilitation leading to early graft strain.
Technical error during the revision surgery (e.g., malpositioned tunnels).
Biological healing failure or graft incorporation issues with the allograft.
Undiagnosed or untreated concomitant ligamentous injuries.
Return to sport too early, before graft maturation.

Correct Answer: Biological healing failure or graft incorporation issues with the allograft.

Explanation:

Question 78:

Options:

Emergent open reduction and internal fixation of the radius and ulna fractures.
Immediate forearm fasciotomy.
Nerve decompression of the median and ulnar nerves.
Observation with serial neurological and vascular examinations every hour.
Application of a bivalved cast and elevation.

Correct Answer: Immediate forearm fasciotomy.

Explanation:

Question 79:

Options:

Debridement of the torn cuff and subacromial decompression.
Latissimus dorsi tendon transfer.
Superior capsular reconstruction (SCR).
Reverse total shoulder arthroplasty (rTSA).
Partial rotator cuff repair.

Correct Answer: Reverse total shoulder arthroplasty (rTSA).

Explanation:

Question 80:

Options:

Immediate surgical decompression and debridement.
Initiation of empirical broad-spectrum intravenous antibiotics.
Placement of a percutaneous drain for the epidural abscess.
Aggressive pain management with narcotics and muscle relaxants.
Referral for immediate radiation therapy.

Correct Answer: Initiation of empirical broad-spectrum intravenous antibiotics.

Explanation:

Question 81:

Options:

Immediate surgical decompression and debridement.
Initiation of empirical broad-spectrum intravenous antibiotics after obtaining cultures.
Placement of a percutaneous drain for the epidural abscess.
Aggressive pain management with narcotics and muscle relaxants.
Referral for immediate radiation therapy.

Correct Answer: Initiation of empirical broad-spectrum intravenous antibiotics after obtaining cultures.

Explanation:

Question 82:

Options:

Immediate operative fixation of the sacral fracture.
Conservative management with bed rest and pain control.
Assessment for spinopelvic dissociation and associated injuries.
Thorough neurological examination, specifically evaluating S2-S4 nerve root function.
Application of a thoracolumbosacral orthosis (TLSO).

Correct Answer: Thorough neurological examination, specifically evaluating S2-S4 nerve root function.

Explanation:

Question 83:

Options:

Pelvic Tilt (PT) less than 20 degrees.
Sacral Slope (SS) greater than 30 degrees.
Thoracic Kyphosis (TK) between 20-50 degrees.
PI-LL mismatch less than 10 degrees.
C7 plumb line falling within 2 cm of the sacral promontory.

Correct Answer: PI-LL mismatch less than 10 degrees.

Explanation:

Question 84:

Options:

The patient's young age and potential for growth.
The specific histological subtype of osteosarcoma.
The extent of functional preservation anticipated after limb salvage.
Proximity of the tumor to the knee joint, necessitating total knee replacement.
The patient's desire to pursue competitive sports post-treatment.

Correct Answer: The extent of functional preservation anticipated after limb salvage.

Explanation:

Question 85:

Options:

Proximal femoral varus derotation osteotomy.
Distal femoral extension osteotomy with patellar tendon advancement.
Tibial tubercle transfer for patella baja.
Selective dorsal rhizotomy.
Repeated hamstring lengthenings.

Correct Answer: Distal femoral extension osteotomy with patellar tendon advancement.

Explanation:

Question 86:

Options:

Intercostal nerve to musculocutaneous nerve transfer.
Accessory nerve to suprascapular nerve transfer.
Ulnar fascicle of the median nerve to musculocutaneous nerve (Oberlin transfer).
Pectoralis major motor branch to musculocutaneous nerve transfer.
Phrenic nerve to musculocutaneous nerve transfer.

Correct Answer: Ulnar fascicle of the median nerve to musculocutaneous nerve (Oberlin transfer).

Explanation:

Question 87:

Options:

Emergent open reduction and internal fixation (ORIF) to restore joint congruity.
Application of a short leg cast and immediate weight-bearing.
Immediate traction with calcaneal pin insertion.
External fixation spanning the ankle joint with delayed definitive ORIF after soft tissue improvement.
Administration of systemic antibiotics and observation for 24 hours.

Correct Answer: External fixation spanning the ankle joint with delayed definitive ORIF after soft tissue improvement.

Explanation:

Question 88:

Options:

Debridement, antibiotics, and implant retention (DAIR).
Suppressive oral antibiotic therapy.
One-stage revision arthroplasty with cement containing antibiotics.
Two-stage revision arthroplasty with an antibiotic spacer.
Arthrodesis of the knee joint.

Correct Answer: Two-stage revision arthroplasty with an antibiotic spacer.

Explanation:

Question 89:

Options:

Emergent surgical stabilization of all torn ligaments.
Application of a hinged knee brace and non-weight bearing.
Immediate formal angiography to assess for popliteal artery injury.
Reduction of the knee dislocation and reassessment of vascular status.
Administration of high-dose corticosteroids to reduce swelling.

Correct Answer: Reduction of the knee dislocation and reassessment of vascular status.

Explanation:

Knee dislocations carry a significant risk of popliteal artery injury, which can lead to limb loss if not promptly identified and treated. Any sign of vascular compromise (weak pulse, coolness, pallor, paresthesias) dictates immediate action. While reduction of the dislocation should be performed promptly to relieve tension on the neurovascular structures, the *most critical immediate concern* and first step when pulses are weak and the foot is cool is to formally assess vascular integrity, typically with angiography (CT angiography is often preferred acutely). Delay in diagnosing and treating arterial injury can result in irreversible ischemia and amputation. Surgical stabilization of ligaments is typically delayed until vascular integrity is ensured and stabilized.

Question 90:

A 50-year-old diabetic patient presents with a 6-month history of a persistent sinus tract in the proximal tibia, unresponsive to multiple courses of oral antibiotics. Plain radiographs show sequestrum and involucrum formation. A bone biopsy confirms chronic osteomyelitis with culture growing *Pseudomonas aeruginosa*. After thorough debridement, a significant bone defect remains. Which of the following is the most appropriate next step in the surgical management of this chronic osteomyelitis?

Options:

Primary wound closure and 6 weeks of intravenous antibiotics.
Application of a negative pressure wound therapy (NPWT) device.
Placement of antibiotic-impregnated cement beads or calcium sulfate pellets into the defect.
Immediate free vascularized fibula graft for bone reconstruction.
Long-term oral suppressive antibiotics alone.

Correct Answer: Placement of antibiotic-impregnated cement beads or calcium sulfate pellets into the defect.

Explanation:

Question 91:

Options:

Increase the dose of alendronate.
Switch to another oral bisphosphonate like risedronate.
Initiate an anabolic agent such as teriparatide or romosozumab.
Prescribe calcium and Vitamin D supplementation only.
Discontinue all osteoporosis medications due to bisphosphonate failure.

Correct Answer: Initiate an anabolic agent such as teriparatide or romosozumab.

Explanation:

Question 92:

Options:

Anterior cervical discectomy and fusion (ACDF).
Posterior atlantoaxial fusion.
Occipitocervical fusion.
Laminectomy of C1 and C2.
Halo vest immobilization.

Correct Answer: Occipitocervical fusion.

Explanation:

Question 93:

Options:

Traumatic brachial plexus injury.
Massive rotator cuff tear.
Ganglion cyst originating from the glenohumeral joint.
Os acromiale impinging on the nerve.
Entrapment by the superior transverse scapular ligament.

Correct Answer: Ganglion cyst originating from the glenohumeral joint.

Explanation:

Question 94:

Options:

Elevation of the limb and application of ice.
Administration of strong opioid analgesics.
Emergency fasciotomy of the affected compartments.
Observation for signs of arterial compromise and repeat compartment pressure measurements in 6 hours.
Application of a tight compression dressing to reduce swelling.

Correct Answer: Emergency fasciotomy of the affected compartments.

Explanation:

Question 95:

Options:

Autologous chondrocyte implantation (ACI).
Bone marrow aspirate concentrate (BMAC).
Platelet-rich plasma (PRP) injection.
Hyaluronic acid injection.
Stem cell transplantation from embryonic sources.

Correct Answer: Platelet-rich plasma (PRP) injection.

Explanation:

Question 96:

Options:

Immediate surgical fusion of the midfoot joints.
Administration of broad-spectrum intravenous antibiotics.
Strict non-weight bearing with total contact casting (TCC).
Elevation and application of ice packs to the foot.
Conservative management with over-the-counter pain relievers.

Correct Answer: Strict non-weight bearing with total contact casting (TCC).

Explanation:

Question 97:

Options:

Scapholunate ligament repair.
Proximal row carpectomy (PRC).
Total wrist arthrodesis.
Scaphoid excision and four-corner fusion (4CF).
Radioscapholunate arthrodesis.

Correct Answer: Scaphoid excision and four-corner fusion (4CF).

Explanation:

Question 98:

Options:

The patient's age and activity level.
The percentage of canal compromise alone.
The presence of significant posterior ligamentous complex (PLC) injury.
The associated fracture of the transverse processes.
The amount of vertebral body comminution.

Correct Answer: The presence of significant posterior ligamentous complex (PLC) injury.

Explanation:

Question 99:

Options:

Talonavicular subluxation with the navicular dorsally dislocated on the talar head; serial casting (Ponseti method).
Abnormal development of the talus causing a 'vertical' orientation; early surgical release of soft tissues.
Fixed equinus deformity of the hindfoot; serial casting to stretch the Achilles tendon.
Dorsal dislocation of the navicular on the talar head; serial casting in reverse Ponseti method followed by surgery.
Adduction and supination of the forefoot; manipulation and casting in a clubfoot protocol.

Correct Answer: Dorsal dislocation of the navicular on the talar head; serial casting in reverse Ponseti method followed by surgery.

Explanation:

Question 100:

Options:

A standard cemented femoral stem.
A short-stem uncemented femoral component.
A modular extensively coated uncemented stem with distal fixation.
An impaction grafting technique with a cemented stem.
A calcar-replacing cemented stem.

Correct Answer: A modular extensively coated uncemented stem with distal fixation.

Explanation:

Question 101:

Options:

Removal of loose bodies in the hip joint.
Debridement of osteoarthritic cartilage lesions.
Reshaping of the femoral head-neck junction and acetabular rim, and repair/debridement of the labral tear.
Total hip arthroplasty for end-stage arthritis.
Synovectomy for inflammatory arthritis.

Correct Answer: Reshaping of the femoral head-neck junction and acetabular rim, and repair/debridement of the labral tear.

Explanation:

Detailed Chapters & Topics

Dive deeper into specialized chapters regarding arab-board-orthopedic-mcqs-online-bank-improve-your-knowledge-and-skills-1

44 Chapters

Chapter 1 18 min

Hereditary Multiple Exostoses: Arab Board Orthopedic Review

Test your knowledge on Hereditary Multiple Exostoses (HME) with 10 Prometric-style MCQs covering genetics, deformities,…

Chapter 2 52 min

Dysplasia Epiphysealis Hemimelica (DEH) MCQs - Arab Board

Test your knowledge on Dysplasia Epiphysealis Hemimelica (DEH) with these Arab Board-style orthopedic MCQs covering epi…

Chapter 3 59 min

Skeletal Dysplasias of the Spine MCQs - Arab Board Ortho

Test your knowledge on skeletal dysplasias with major spine involvement, including Achondroplasia, Morquio, and SEDC, w…

Chapter 4 54 min

Achondroplasia Orthopedic MCQs - Arab Board Exam Prep

Test your knowledge on Achondroplasia with these Arab Board-style MCQs. Covers genetics, clinical features, and radiogr…

Chapter 5 63 min

Orthopedic Board Prep MCQs: High-Yield Trauma & Dislocation Questions

Master your exams with our Orthopedic Board Prep MCQs. Practice high-yield trauma and dislocation questions in study or…

Chapter 6 48 min

Arab Board Orthopedic Exam: Skeletal Dysplasias MCQs

Expert-level MCQs on Skeletal Dysplasias, including HME, Ollier's, Maffucci, and Fibrous Dysplasia for Arab Board Ortho…

Chapter 7 81 min

Arab Orthopaedic Board MCQs - Part 2

Practice Arab Orthopaedic Board MCQs Part 2. Review orthopedic surgery questions 51 to 100 for your board exam preparat…

Chapter 8 105 min

Arab Orthopaedic Board MCQs - Part 3

Practice Arab Orthopaedic Board MCQs Part 3. Review orthopedic surgery questions 101 to 150 for your board exam prepara…

Chapter 9 109 min

Arab Orthopaedic Board MCQs - Part 4

Practice Arab Orthopaedic Board MCQs Part 4. Review orthopedic surgery questions 151 to 200 for your board exam prepara…

Chapter 10 26 min

Arab Orthopaedic Board MCQs - Part 5

Practice Arab Orthopaedic Board MCQs Part 5. Review orthopedic surgery questions 201 to 250 for your board exam prepara…

Chapter 11 92 min

Arab Orthopaedic Board MCQs - Part 6

Practice Arab Orthopaedic Board MCQs Part 6. Review orthopedic surgery questions 251 to 300 for your board exam prepara…

Chapter 12 28 min

Arab Orthopaedic Board MCQs - Part 7

Practice Arab Orthopaedic Board MCQs Part 7. Review orthopedic surgery questions 301 to 350 for your board exam prepara…

Chapter 13 82 min

Arab Orthopaedic Board MCQs - Part 8

Practice Arab Orthopaedic Board MCQs Part 8. Review orthopedic surgery questions 351 to 400 for your board exam prepara…

Chapter 14 101 min

Arab Orthopaedic Board MCQs - Part 9

Practice Arab Orthopaedic Board MCQs Part 9. Review orthopedic surgery questions 401 to 450 for your board exam prepara…

Chapter 15 59 min

Arab Orthopaedic Board MCQs - Part 10

Practice Arab Orthopaedic Board MCQs Part 10. Review orthopedic surgery questions 451 to 500 for your board exam prepar…

Chapter 16 59 min

Arab Orthopaedic Board MCQs - Part 11

Practice Arab Orthopaedic Board MCQs Part 11. Review orthopedic surgery questions 501 to 550 for your board exam prepar…

Chapter 17 133 min

Arab Orthopaedic Board MCQs - Part 12

Practice Arab Orthopaedic Board MCQs Part 12. Review orthopedic surgery questions 551 to 600 for your board exam prepar…

Chapter 18 29 min

Arab Orthopaedic Board MCQs - Part 13

Practice Arab Orthopaedic Board MCQs Part 13. Review orthopedic surgery questions 601 to 650 for your board exam prepar…

Chapter 19 74 min

Arab Orthopaedic Board MCQs - Part 14

Practice Arab Orthopaedic Board MCQs Part 14. Review orthopedic surgery questions 651 to 700 for your board exam prepar…

Chapter 20 76 min

Arab Orthopaedic Board MCQs - Part 15

Practice Arab Orthopaedic Board MCQs Part 15. Review orthopedic surgery questions 701 to 750 for your board exam prepar…

Chapter 21 90 min

Arab Orthopaedic Board MCQs - Part 16

Practice Arab Orthopaedic Board MCQs Part 16. Review orthopedic surgery questions 751 to 800 for your board exam prepar…

Chapter 22 29 min

Arab Orthopaedic Board MCQs - Part 17

Practice Arab Orthopaedic Board MCQs Part 17. Review orthopedic surgery questions 801 to 850 for your board exam prepar…

Chapter 23 52 min

Arab Orthopaedic Board MCQs - Part 18

Practice Arab Orthopaedic Board MCQs Part 18. Review orthopedic surgery questions 851 to 900 for your board exam prepar…

Chapter 24 25 min

Arab Orthopaedic Board MCQs - Part 19

Practice Arab Orthopaedic Board MCQs Part 19. Review orthopedic surgery questions 901 to 950 for your board exam prepar…

Chapter 25 86 min

Arab Orthopaedic Board MCQs - Part 20

Practice Arab Orthopaedic Board MCQs Part 20. Review orthopedic surgery questions 951 to 1000 for your board exam prepa…

Chapter 26 48 min

Arab Orthopaedic Board MCQs - Part 21

Practice Arab Orthopaedic Board MCQs Part 21. Review orthopedic surgery questions 1001 to 1050 for your board exam prep…

Chapter 27 79 min

Arab Orthopaedic Board MCQs - Part 22

Practice Arab Orthopaedic Board MCQs Part 22. Review orthopedic surgery questions 1051 to 1100 for your board exam prep…

Chapter 28 58 min

Arab Orthopaedic Board MCQs - Part 23

Practice Arab Orthopaedic Board MCQs Part 23. Review orthopedic surgery questions 1101 to 1150 for your board exam prep…

Chapter 29 137 min

Arab Orthopaedic Board MCQs - Part 24

Practice Arab Orthopaedic Board MCQs Part 24. Review orthopedic surgery questions 1151 to 1200 for your board exam prep…

Chapter 30 105 min

Arab Orthopaedic Board MCQs - Part 25

Practice Arab Orthopaedic Board MCQs Part 25. Review orthopedic surgery questions 1201 to 1250 for your board exam prep…

Chapter 31 87 min

Arab Orthopaedic Board MCQs - Part 26

Practice Arab Orthopaedic Board MCQs Part 26. Review orthopedic surgery questions 1251 to 1300 for your board exam prep…

Chapter 32 26 min

Arab Orthopaedic Board MCQs - Part 27

Practice Arab Orthopaedic Board MCQs Part 27. Review orthopedic surgery questions 1301 to 1350 for your board exam prep…

Chapter 33 114 min

Arab Orthopaedic Board MCQs - Part 28

Practice Arab Orthopaedic Board MCQs Part 28. Review orthopedic surgery questions 1351 to 1400 for your board exam prep…

Chapter 34 79 min

Arab Orthopaedic Board MCQs - Part 29

Practice Arab Orthopaedic Board MCQs Part 29. Review orthopedic surgery questions 1401 to 1450 for your board exam prep…

Chapter 35 26 min

Arab Orthopaedic Board MCQs - Part 30

Practice Arab Orthopaedic Board MCQs Part 30. Review orthopedic surgery questions 1451 to 1500 for your board exam prep…

Chapter 36 123 min

Arab Orthopaedic Board MCQs - Part 31

Practice Arab Orthopaedic Board MCQs Part 31. Review orthopedic surgery questions 1501 to 1550 for your board exam prep…

Chapter 37 58 min

Arab Orthopaedic Board MCQs - Part 32

Practice Arab Orthopaedic Board MCQs Part 32. Review orthopedic surgery questions 1551 to 1600 for your board exam prep…

Chapter 38 126 min

Arab Orthopaedic Board MCQs - Part 33

Practice Arab Orthopaedic Board MCQs Part 33. Review orthopedic surgery questions 1601 to 1650 for your board exam prep…

Chapter 39 75 min

Arab Orthopaedic Board MCQs - Part 34

Practice Arab Orthopaedic Board MCQs Part 34. Review orthopedic surgery questions 1651 to 1700 for your board exam prep…

Chapter 40 25 min

Arab Orthopaedic Board MCQs - Part 35

Practice Arab Orthopaedic Board MCQs Part 35. Review orthopedic surgery questions 1701 to 1750 for your board exam prep…

Chapter 41 128 min

Arab Orthopaedic Board MCQs - Part 36

Practice Arab Orthopaedic Board MCQs Part 36. Review orthopedic surgery questions 1751 to 1800 for your board exam prep…

Chapter 42 133 min

Arab Orthopaedic Board MCQs - Part 37

Practice Arab Orthopaedic Board MCQs Part 37. Review orthopedic surgery questions 1801 to 1850 for your board exam prep…

Chapter 43 87 min

Arab Orthopaedic Board MCQs - Part 38

Practice Arab Orthopaedic Board MCQs Part 38. Review orthopedic surgery questions 1851 to 1900 for your board exam prep…

Chapter 44 91 min

Arab Orthopaedic Board MCQs - Part 39

Practice Arab Orthopaedic Board MCQs Part 39. Review orthopedic surgery questions 1901 to 1950 for your board exam prep…

Back to All Master Guides

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Prof. Clinic OS

Consultant Orthopedic & Spine Surgeon

Quick Medical Answer

Arab Board Orthopedic B Review | Dr Hutaif General Orth -...

Detailed Chapters & Topics

Hereditary Multiple Exostoses: Arab Board Orthopedic Review

Dysplasia Epiphysealis Hemimelica (DEH) MCQs - Arab Board

Skeletal Dysplasias of the Spine MCQs - Arab Board Ortho

Achondroplasia Orthopedic MCQs - Arab Board Exam Prep

Orthopedic Board Prep MCQs: High-Yield Trauma & Dislocation Questions

Arab Board Orthopedic Exam: Skeletal Dysplasias MCQs

Arab Orthopaedic Board MCQs - Part 2

Arab Orthopaedic Board MCQs - Part 3

Arab Orthopaedic Board MCQs - Part 4

Arab Orthopaedic Board MCQs - Part 5

Arab Orthopaedic Board MCQs - Part 6

Arab Orthopaedic Board MCQs - Part 7

Arab Orthopaedic Board MCQs - Part 8

Arab Orthopaedic Board MCQs - Part 9

Arab Orthopaedic Board MCQs - Part 10

Arab Orthopaedic Board MCQs - Part 11

Arab Orthopaedic Board MCQs - Part 12

Arab Orthopaedic Board MCQs - Part 13

Arab Orthopaedic Board MCQs - Part 14

Arab Orthopaedic Board MCQs - Part 15

Arab Orthopaedic Board MCQs - Part 16

Arab Orthopaedic Board MCQs - Part 17

Arab Orthopaedic Board MCQs - Part 18

Arab Orthopaedic Board MCQs - Part 19

Arab Orthopaedic Board MCQs - Part 20

Arab Orthopaedic Board MCQs - Part 21

Arab Orthopaedic Board MCQs - Part 22

Arab Orthopaedic Board MCQs - Part 23

Arab Orthopaedic Board MCQs - Part 24

Arab Orthopaedic Board MCQs - Part 25

Arab Orthopaedic Board MCQs - Part 26

Arab Orthopaedic Board MCQs - Part 27

Arab Orthopaedic Board MCQs - Part 28

Arab Orthopaedic Board MCQs - Part 29

Arab Orthopaedic Board MCQs - Part 30

Arab Orthopaedic Board MCQs - Part 31

Arab Orthopaedic Board MCQs - Part 32

Arab Orthopaedic Board MCQs - Part 33

Arab Orthopaedic Board MCQs - Part 34

Arab Orthopaedic Board MCQs - Part 35

Arab Orthopaedic Board MCQs - Part 36

Arab Orthopaedic Board MCQs - Part 37

Arab Orthopaedic Board MCQs - Part 38

Arab Orthopaedic Board MCQs - Part 39

Guide Overview