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Orthopaedic Surgery Board Exam Review: ABOS Part I & AAOS OITE Prep Questions | Part 22210

Orthopedic Board Exam Prep: Interactive MCQ Practice & Study Engine

23 Apr 2026 124 min read 133 Views
Chinese Graduating Exam Mods: Your Guide to Acing the Test

Key Takeaway

Preparing for Orthopedic Board Exams is optimized with an interactive MCQ engine. It provides high-yield practice questions for various orthopedic topics. Users can engage in study or timed exam modes, receiving instant scores and detailed explanations. This reinforces knowledge, identifies weak areas, and ensures comprehensive readiness for your orthopaedics certification.

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Question 1

A 45-year-old male sustains a high-energy open tibia fracture (Gustilo IIIB) and a pelvic ring injury (APC II) after a motorcycle accident. Initial resuscitation is ongoing. He develops progressive tachycardia (HR 110 bpm), tachypnea (RR 24 bpm), temperature 38.8°C, and a white blood cell count of 15,000/µL. Based on the provided general medical definitions, which of the following best describes his current systemic state and the most immediate concern in the context of major orthopedic trauma?





Explanation

The patient meets criteria for Systemic Inflammatory Response Syndrome (SIRS): tachycardia (>90 bpm), tachypnea (>20 bpm), fever (>38°C), and leukocytosis (>12,000/µL). SIRS is a generalized inflammatory response to various severe insults (trauma, infection, burns, pancreatitis). While it doesn't necessarily mean infection (sepsis), it can certainly predispose to Multiple Organ Dysfunction Syndrome (MODS) if not managed effectively, particularly in polytrauma patients. MODS is defined by dysfunction of two or more organ systems, which he does not yet explicitly have. Definitive fracture fixation is important but not the most immediate descriptor of his systemic state based on the question. This is a critical state to monitor for progression to MODS and potential sepsis.

Question 2

A 68-year-old male undergoes a complex revision total hip arthroplasty. Postoperatively, he develops hypotension, oliguria, and increasing serum creatinine. Given the potential for significant blood loss and release of inflammatory mediators during such a procedure, which of the following is the most likely initial mechanism leading to acute renal failure in this orthopedic context, correlating with the provided general medical content?





Explanation

In the context of major orthopedic surgery like revision arthroplasty, significant blood loss can lead to hypovolemia and subsequent renal hypoperfusion. This renal ischemia is a primary mechanism for acute kidney injury (AKI), as mentioned in the general medical content regarding 'renal ischemia' and 'ischemia-reperfusion injury' as causes of acute renal failure. While nephrotoxic antibiotics or obstructive uropathy can cause AKI, renal ischemia due to surgical stress and potential hypovolemia is often the initial and most common pathway in such a scenario. The other options are less likely primary mechanisms post-major orthopedic surgery in an otherwise healthy patient without specific risk factors.

Question 3

A 72-year-old patient with well-controlled type 2 diabetes and a history of penicillin allergy (rash) is scheduled for an elective total knee arthroplasty. According to prophylactic antibiotic guidelines and general principles, which of the following antibiotic regimens is the most appropriate prophylactic choice to prevent periprosthetic joint infection?





Explanation

For patients with a history of penicillin allergy, especially non-severe reactions like a rash, a cephalosporin such as cefazolin might still be considered due to its excellent efficacy and narrow spectrum. However, for a board-level question and especially in the context of prophylaxis for arthroplasty where the consequence of infection is severe, Vancomycin is the safest and most commonly recommended alternative in patients with a stated penicillin allergy, particularly for a 'rash' which could still represent a Type I hypersensitivity. Cefazolin carries a low but present cross-reactivity risk. Clindamycin is an alternative but often preferred for patients with severe beta-lactam allergies (anaphylaxis) or if methicillin-resistant S. aureus (MRSA) coverage is specifically desired and Vancomycin cannot be used; it has less robust data than cefazolin or vancomycin. Daptomycin is generally reserved for treating established infections rather than prophylaxis. Gentamicin is not typically used for routine prophylaxis in TKA due to potential nephrotoxicity and narrow spectrum for skin flora.

Question 4

A 38-year-old male sustains a severe open pilon fracture (Gustilo IIIC) with significant soft tissue avulsion and segmental bone loss. Surgical debridement and external fixation are performed. Which of the following is the most compelling indication for prophylactic antibiotic use in this specific orthopedic scenario, referencing the general medical principles of antibiotic prophylaxis?





Explanation

The primary indication for prophylactic antibiotics in this case aligns directly with point (1) from the general medical principles: 'Severe trauma, such as large-area burns, open fractures, gunshot wounds, perforation of abdominal organs, and injuries with severe contamination and soft tissue destruction.' An open pilon fracture, especially Gustilo IIIC, involves severe trauma, contamination, and extensive soft tissue damage, placing it at extremely high risk for infection. While the duration of surgery or later implant placement are relevant, the initial and most compelling indication is the nature of the trauma itself. Patient age/health and rehabilitation are not primary indications for prophylactic antibiotics.

Question 5

A 55-year-old patient is diagnosed with a high-grade leiomyosarcoma of the proximal thigh. Preoperative imaging has confirmed no distant metastases. When planning definitive surgical resection, which of the following 'tumor surgery principles' is most critical to prevent local recurrence and achieve a curative outcome?





Explanation

The fundamental principle of oncologic surgery, particularly for high-grade sarcomas, is to achieve negative (R0) surgical margins. This is encapsulated by the principle 'not cutting through the tumor' and 'resecting by dissecting from periphery to center, always in normal tissue surrounding the tumor.' Ensuring negative margins by resecting the tumor en bloc with a cuff of normal tissue (wide resection) is the most critical factor for preventing local recurrence and maximizing the chance of cure, directly aligning with the provided general 'tumor surgery principles.' While neoadjuvant/adjuvant chemotherapy, preoperative biopsy, and limb salvage are important considerations, achieving clear margins is the cornerstone of local tumor control. A wide excisional biopsy is inappropriate; an incisional or core needle biopsy is done first.

Question 6

A 28-year-old male presents to the emergency department after a motor vehicle accident with bilateral femoral shaft fractures and a closed head injury. He is hypotensive (BP 80/50 mmHg), tachycardic (HR 130 bpm), and confused. Which of the following 'special monitoring' parameters would provide the most immediate and critical information regarding his cardiovascular status and guide ongoing resuscitation efforts, referencing the provided general surgical shock monitoring guidelines?





Explanation

In a hypotensive trauma patient, assessing fluid status is paramount. While all listed special monitoring parameters are relevant in severe shock, Central Venous Pressure (CVP) is a relatively quick and accessible measure of right ventricular preload and systemic fluid status, guiding initial fluid resuscitation. It directly aligns with the 'special monitoring' for surgical shock. While lactate levels reflect tissue hypoperfusion, CVP provides direct information about intravascular volume. PCWP, CO/CI provide more advanced hemodynamic profiles usually after initial stabilization, and gastric mucosal pH monitoring is for assessing gut perfusion, typically later in ICU management. Given his instability, CVP helps guide the immediate fluid challenge.

Question 7

A 60-year-old patient with poorly controlled diabetes and a history of chronic osteomyelitis of the distal tibia is scheduled for a debridement and external fixation. According to the general principles for prophylactic antibiotic use, which of the following is an additional significant indication for administering prophylactic antibiotics in this patient, beyond the surgical procedure itself?





Explanation

The general principles for prophylactic antibiotic use specifically state: '(4) Patients with high-risk factors for infection, such as advanced age, malnutrition, diabetes, granulocytopenia; or those undergoing steroid, immunosuppressant, or anticancer drug therapy, and those with immune dysfunction requiring surgery.' Poorly controlled diabetes significantly impairs immune function and microvascular circulation, placing the patient at a much higher risk for surgical site infection. While chronic osteomyelitis is a concern, the question asks for an additional indication for prophylactic use, distinct from the treatment of his existing infection. His diabetes is a direct 'high-risk factor' for infection prophylaxis.

Question 8

A 30-year-old male suffers a crush injury to his lower extremity after being trapped under heavy machinery for several hours. On arrival, he is found to have a swollen, tense calf, painful passive ankle dorsiflexion, and weak toe extension. His urine is dark brown. Which of the following mechanisms for acute renal failure, identified in the general medical content, is most directly implicated in this orthopedic trauma scenario?





Explanation

This patient's presentation is classic for crush syndrome and impending or actual compartment syndrome. The dark brown urine suggests rhabdomyolysis (muscle breakdown), which releases myoglobin into the bloodstream. Myoglobin is nephrotoxic, directly causing 'renal tubular epithelial cell degeneration and necrosis' and mechanical obstruction of the renal tubules as myoglobin casts form. This aligns with point (2) of the general medical content on acute renal failure mechanisms ('renal tubular epithelial cell degeneration and necrosis') and (3) ('renal tubular mechanical obstruction'). While ischemia-reperfusion injury is also relevant to crush injuries, the direct pathological mechanism causing renal failure from myoglobin is tubular damage. The other options are less relevant to this specific clinical picture.

Question 9

A 16-year-old male with a suspected osteosarcoma of the distal femur undergoes an open biopsy. During the procedure, the surgeon inadvertently incises through the suspected tumor mass. According to the general 'tumor surgery principles,' which of the following describes the most significant immediate consequence of this technical error?





Explanation

The 'not cutting through the tumor' principle is paramount in musculoskeletal oncology. Inadvertently incising through a sarcoma significantly increases the risk of tumor cell spillage and local recurrence. This technical error can 'seed' the wound or surrounding tissues, potentially requiring a wider, more radical resection or even amputation to achieve clear margins, thereby worsening the prognosis for local control. This directly violates the 'unsectional principle' and the 'prevention of tumor cell shedding and hematogenous metastasis during surgery' from the general medical principles. While accuracy of diagnosis might be slightly affected if the representative sample is compromised, the primary and most concerning consequence in terms of oncologic outcome is the increased risk of local recurrence.

Question 10

In a patient presenting with high-energy pelvic ring instability after blunt trauma, persistent hypotension unresponsive to initial fluid resuscitation is observed. The 'general monitoring' of surgical shock is ongoing. Which of the following 'special monitoring' parameters provides the most crucial, real-time feedback for guiding massive transfusion protocol activation and potential need for angiography or embolization to control ongoing hemorrhage?





Explanation

While CVP, urine output, and serial Hgb/Hct are important for general shock monitoring, in persistent hypotension from pelvic hemorrhage, 'dynamic arterial blood gas analysis' specifically looking at base deficit and lactate provides real-time assessment of tissue hypoperfusion and ongoing shock severity. A persistently high lactate and worsening base deficit despite fluid resuscitation are strong indicators of ongoing hemorrhage and metabolic acidosis, demanding immediate, aggressive intervention like a massive transfusion protocol, pelvic external fixation, and potentially angiography/embolization to control the bleeding source. This aligns with 'dynamic blood gas analysis' and 'arterial blood lactate measurement' from the 'special monitoring' list, as these are more dynamic indicators of circulatory failure than static Hgb/Hct or CVP.

Question 11

A 70-year-old patient undergoes an elective total knee arthroplasty. During the postoperative period, she develops fever, severe abdominal pain, and significant jaundice. This constellation of symptoms, coupled with a history of gallstones, is highly suspicious for acute cholangitis. Based on the provided general medical definitions, which specific clinical syndrome involving additional features of shock and CNS depression would indicate a fulminant and life-threatening progression requiring urgent surgical intervention?





Explanation

The question describes a progression from Charcot's Triad (abdominal pain, fever, jaundice) to a more severe state with 'additional features of shock and CNS depression'. This specific clinical picture is defined as Reynold's Pentad, which is characteristic of acute obstructive suppurative cholangitis and signifies a severe, life-threatening infection requiring emergency decompression. The general medical content explicitly states: 'Charcot's Triad is abdominal pain, chills and high fever, jaundice, while Reynold's Pentad further adds shock and central nervous system depression. Seen in acute obstructive suppurative cholangitis.' SIRS and MODS are broader systemic responses, and Krukenberg tumor is unrelated.

Question 12

A 50-year-old male with a recent history of gastric cancer presents with bilateral ovarian masses. While typically outside the orthopedic domain, the provided general medical content specifically defines a metastatic tumor type relevant to this scenario. Which of the following diagnoses aligns with the general medical description?





Explanation

The provided general medical content explicitly defines 'Krukenberg tumor' as: 'metastatic mucinous adenocarcinoma in the ovaries, usually from gastric primary.' This scenario precisely matches the description: a patient with gastric cancer developing bilateral ovarian masses. While it's a general medical concept, the question directly references the provided content, making Krukenberg tumor the correct answer.

Question 13

A 35-year-old patient undergoes open reduction and internal fixation of a distal femur fracture. Postoperatively, she develops a high fever, productive cough, and increasing shortness of breath. Her WBC count is elevated, and chest X-ray shows new infiltrates. These findings, along with her recent surgery, meet criteria for SIRS. What is the most crucial next step to determine if she has progressed to sepsis, according to general medical definitions?





Explanation

Sepsis is defined as SIRS with a confirmed or suspected source of infection. The patient meets SIRS criteria and has signs of a pulmonary infection. To confirm sepsis, identifying the infectious source through cultures (blood, sputum) is paramount before initiating targeted antibiotic therapy. While empirical antibiotics might be considered, obtaining cultures before antibiotics (if clinical situation allows) is crucial for guiding definitive treatment. The other options are either treatment steps (antibiotics, vasopressors), diagnostic steps for other conditions (CTPA), or monitoring (repeat WBC) that doesn't establish the infectious source.

Question 14

A 60-year-old male presents with acute onset of severe low back pain radiating down both legs, associated with bilateral leg weakness and urinary retention following a minor fall. Physical exam reveals saddle anesthesia. Which of the following orthopedic diagnoses is most likely, and what is its typical management priority?





Explanation

The patient's symptoms (bilateral leg weakness, urinary retention, saddle anesthesia) are classic for Cauda Equina Syndrome (CES), a surgical emergency. This condition results from compression of the cauda equina nerve roots, typically by a large disc herniation, tumor, or trauma. Urgent surgical decompression is required to prevent permanent neurological deficits, especially bladder and bowel dysfunction. The other options describe conditions with less acute or less severe neurological deficits and typically have different management algorithms.

Question 15

A 25-year-old professional athlete sustains an anterior cruciate ligament (ACL) rupture during a soccer game. She reports hearing a 'pop' and describes immediate swelling and instability. Which of the following is the most sensitive physical examination test for diagnosing an acute ACL rupture?





Explanation

The Lachman test is considered the most sensitive physical examination test for diagnosing an acute ACL rupture, especially when performed within the first few hours to days before significant guarding and swelling limit examination. It assesses anterior translation of the tibia on the femur with the knee in 20-30 degrees of flexion. McMurray's test is for meniscal tears. Varus stress tests the LCL. Patellar apprehension test is for patellar instability. Posterior sag sign/Posterior drawer test assesses PCL integrity.

Question 16

A 70-year-old female with osteoporosis suffers a displaced femoral neck fracture. She has a history of atrial fibrillation on anticoagulation and mild dementia. Which of the following surgical options is generally preferred to minimize the risk of complications and optimize functional outcome in this patient?





Explanation

For elderly patients with displaced femoral neck fractures and cognitive impairment or significant comorbidities (like atrial fibrillation on anticoagulation), hemiarthroplasty is generally preferred. It offers a quicker recovery compared to THA, lower dislocation rates than THA in cognitively impaired patients, and avoids the high rates of failure, avascular necrosis, and nonunion associated with internal fixation (cannulated screws, DHS) in displaced fractures in osteoporotic bone. Conservative management is associated with high mortality and morbidity. THA is typically reserved for more active, cognitively intact patients.

Question 17

A 10-year-old male presents with a painful limp and limited internal rotation of the hip. Radiographs show a widening of the physis and posterior and inferior displacement of the femoral head relative to the femoral neck. Which of the following conditions is most likely, and what is the standard management?





Explanation

The clinical presentation (painful limp, limited internal rotation) and radiographic findings (widening of physis, posterior/inferior displacement of femoral head) are classic for Slipped Capital Femoral Epiphysis (SCFE). SCFE is a condition of adolescence where the growth plate weakens and the epiphysis slips off the metaphysis. It is an orthopedic emergency to prevent further slip and avascular necrosis, requiring immediate surgical pinning in situ. The other conditions have different presentations and management strategies.

Question 18

A 40-year-old construction worker presents with numbness and tingling in his thumb, index, middle, and radial half of the ring finger, worse at night and with repetitive hand activities. He also reports weakness in thumb abduction. Which of the following physical examination findings would be most specific for diagnosing Carpal Tunnel Syndrome?





Explanation

The symptoms are classic for Carpal Tunnel Syndrome (CTS), caused by compression of the median nerve at the wrist. A positive Tinel's sign (tingling/pain with percussion over the median nerve at the wrist) and a positive Phalen's test (symptoms elicited by sustained wrist flexion) are highly specific and sensitive physical examination findings for CTS. Finkelstein's test is for De Quervain's tenosynovitis. Pain with resisted wrist extension can indicate lateral epicondylitis. Weakness in finger adduction is more indicative of ulnar nerve pathology. Pain over the anatomical snuffbox suggests scaphoid injury.

Question 19

A 65-year-old female presents with chronic shoulder pain, weakness, and difficulty lifting her arm above her head. Physical examination reveals atrophy of the supraspinatus and infraspinatus muscles, a positive 'drop arm' test, and significant weakness with external rotation. Which of the following is the most likely diagnosis?





Explanation

The combination of chronic pain, weakness, difficulty with overhead motion, atrophy of specific rotator cuff muscles (supraspinatus, infraspinatus), and a positive 'drop arm' test (inability to smoothly lower the arm from abduction) is highly indicative of a massive rotator cuff tear, often involving multiple tendons. Adhesive capsulitis primarily causes global stiffness. Impingement syndrome is typically painful arc syndrome without significant weakness or muscle atrophy. Glenohumeral osteoarthritis causes pain and stiffness, but rotator cuff signs are not primary. Bicipital tendinopathy causes anterior shoulder pain.

Question 20

A 5-year-old child presents with a limp, hip pain, and restricted hip abduction and internal rotation. Radiographs show increased density (sclerosis) and fragmentation of the femoral head epiphysis. What is the most likely diagnosis?





Explanation

The clinical picture (limp, hip pain, restricted motion in a young child) combined with radiographic findings of increased density and fragmentation of the femoral head epiphysis is classic for Legg-Calve-Perthes disease. This condition is idiopathic avascular necrosis of the femoral head. Transient synovitis is self-limiting inflammation without radiographic changes. Septic arthritis would present acutely with fever and severe pain. SCFE occurs in older children/adolescents with epiphyseal slip. DDH is a developmental abnormality of the hip joint.

Question 21

A 28-year-old male sustains a comminuted intra-articular calcaneal fracture after a fall from height. Which of the following factors is most predictive of a poor functional outcome and may influence the decision for operative versus non-operative management?





Explanation

For intra-articular calcaneal fractures, involvement of the posterior facet (which articulates with the talus) and the degree of disruption of the talar-calcaneal articulation (subtalar joint) are the most critical factors influencing functional outcome. Significant displacement and comminution of the posterior facet lead to subtalar arthritis, pain, and stiffness, which are major determinants of poor outcomes regardless of management. While BMI, smoking, and displacement are relevant, the integrity of the subtalar joint is paramount. Associated spinal fractures are important for overall patient management but not directly predictive of calcaneal fracture outcome specifically.

Question 22

A 58-year-old female presents with sudden onset of severe right shoulder pain and an inability to actively abduct or externally rotate her arm after lifting a heavy box. On examination, she has a positive 'hook test' and a visible 'Popeye' deformity in her upper arm. Which tendon is most likely injured?





Explanation

The sudden onset of shoulder pain, inability to abduct/externally rotate (suggesting rotator cuff involvement), and specifically the 'Popeye' deformity (a bulge in the distal upper arm) along with a positive 'hook test' (for biceps pathology) are classic signs of a rupture of the long head of the biceps tendon. While rotator cuff injury is also likely, the 'Popeye' sign is pathognomonic for biceps rupture. Supraspinatus, infraspinatus, subscapularis, and teres minor are rotator cuff muscles but do not present with a 'Popeye' deformity upon rupture.

Question 23

A 30-year-old male presents with chronic anterior knee pain, exacerbated by squatting and climbing stairs. He has a positive 'patellar grind test' and reproduces pain with compression of the patella into the trochlear groove. Radiographs are unremarkable. What is the most likely diagnosis?





Explanation

The symptoms (anterior knee pain exacerbated by squatting/stairs) and physical exam findings (patellar grind test, pain with patellar compression) are highly suggestive of Patellofemoral Pain Syndrome (PFPS), sometimes referred to as chondromalacia patellae although chondromalacia is a specific cartilage finding rather than a clinical syndrome. PFPS is caused by abnormal tracking or overload of the patellofemoral joint. Meniscal tears typically cause joint line pain, catching, or locking. Patellar tendinopathy causes localized pain at the inferior pole of the patella. ACL injury causes instability. Osgood-Schlatter disease is common in adolescents and causes pain and swelling at the tibial tubercle.

Question 24

A 75-year-old female with severe, disabling osteoarthritis of her bilateral knees is considering total knee arthroplasty (TKA). She expresses concern about postoperative pain and recovery. Which of the following is least likely to be a significant complication unique to TKA?





Explanation

Avascular necrosis (AVN) of the femoral head is a complication primarily associated with hip pathology (e.g., femoral neck fractures, hip dislocations, steroid use) and does not occur as a direct complication of total knee arthroplasty. All other options are well-known, significant complications associated with TKA. Periprosthetic joint infection, DVT/PE, stiffness/arthrofibrosis, and neurovascular injury (e.g., common peroneal nerve palsy from traction or direct injury) are all important risks to counsel patients about before TKA.

Question 25

A 4-year-old child presents with a painless limp. On examination, there is a positive Galeazzi sign and asymmetric thigh folds. Ortolani and Barlow tests are negative. Radiographs show a shallow acetabulum and superior and lateral displacement of the femoral head. Which of the following is the most appropriate management for this condition?





Explanation

The signs (painless limp, positive Galeazzi, asymmetric thigh folds) and radiographic findings (shallow acetabulum, superior/lateral displacement) are consistent with untreated or late-presenting Developmental Dysplasia of the Hip (DDH). Given the child's age (4 years old), the hip is likely significantly dislocated and irreducible by conservative means. Therefore, open reduction with capsulorrhaphy and potentially acetabular or femoral osteotomy is typically required to achieve and maintain reduction, as the soft tissues are contracted and osseous deformities are present. Pavlik harness is for infants, and closed reduction with spica cast is for younger children (typically <18 months) or those who failed harness treatment but do not have fixed deformities.

Question 26

A 32-year-old female sustains a Colles fracture (extra-articular distal radius fracture with dorsal displacement). She is managed with closed reduction and casting. Which of the following is the most important radiographic parameter to assess immediately post-reduction to ensure adequate reduction and minimize complications?





Explanation

For a Colles fracture (dorsally displaced distal radius fracture), restoring the palmar tilt (or volar tilt) is the most critical radiographic parameter to assess post-reduction. Loss of palmar tilt or residual dorsal angulation significantly increases the risk of chronic pain, weakness, and altered wrist biomechanics (e.g., carpal instability, distal radioulnar joint issues). While radial length and inclination are also important, correction of dorsal angulation (restoring palmar tilt) is paramount for Colles fractures. Ulnar variance and ulnar styloid fracture are less critical for immediate functional outcome of the radius fracture itself.

Question 27

A 60-year-old male with a long history of heavy smoking and alcohol use presents with new onset of left hip pain, worse with weight-bearing. Radiographs show a lytic lesion in the proximal femur with cortical destruction. His past medical history includes lung cancer. According to general tumor surgery principles and orthopedic oncology evaluation, which of the following is the most appropriate initial diagnostic and management step?





Explanation

Given the patient's history of lung cancer and the new lytic lesion in the femur, metastatic disease is highly suspected. The most appropriate initial step is to stage the patient comprehensively to assess the extent of disease and identify the primary source (if not already known or to assess for further metastases). A CT scan of the chest, abdomen, and pelvis is essential for this purpose. This is a critical aspect of 'tumor surgery principles' where thorough staging precedes definitive local treatment. An open biopsy is usually performed after staging if the diagnosis is uncertain or to guide specific treatment. Radiation, bisphosphonates, or prophylactic fixation are treatment modalities that would follow diagnosis and staging, guided by the patient's overall prognosis and risk of fracture.

Question 28

A 45-year-old male presents with acute onset of severe left foot pain, swelling, and inability to bear weight after jumping from a ladder. On examination, he has tenderness over the midfoot, a 'gap' is palpable along the medial aspect, and radiographs show disruption of the tarso-metatarsal joint complex with lateral displacement of the second cuneiform. Which of the following is the most appropriate management for this injury?





Explanation

The described injury is a Lisfranc injury (tarso-metatarsal joint complex disruption) with clear displacement. These are often high-energy injuries that are inherently unstable and have a high risk of long-term pain and arthritis if not anatomically reduced and stably fixed. Therefore, Open Reduction and Internal Fixation (ORIF) is the standard of care for displaced and unstable Lisfranc injuries to restore anatomical alignment and prevent long-term complications. Conservative management (RICE, casting) is only appropriate for purely ligamentous, non-displaced injuries (often diagnosed by stress radiographs or MRI). Steroid injections and physical therapy are not primary treatments for acute displaced Lisfranc injuries.

Question 29

A 22-year-old male sustains a spiral fracture of the midshaft tibia with an intact fibula. He is placed in a long leg cast. Twenty-four hours later, he reports increasing pain disproportionate to the injury, unrelieved by analgesia. On examination, his toes are mottled, and passive dorsiflexion of the ankle causes excruciating pain. Which of the following 'special monitoring' parameters from the general surgical shock guidelines, when adapted to compartment syndrome, would be most useful for rapid diagnosis and intervention?





Explanation

The patient's symptoms are classic for acute compartment syndrome: pain disproportionate to injury, pain with passive stretch, paresthesias/pallor (mottling). The 'special monitoring' that is most useful for rapid diagnosis in this context is direct intracompartmental pressure measurement. While systemic markers like lactate and ABGs can indicate overall tissue hypoperfusion, they do not directly diagnose compartment syndrome. CVP and CO/CI are for systemic hemodynamic monitoring. Elevated intracompartmental pressure (typically >30 mmHg or within 30 mmHg of diastolic blood pressure) is the objective diagnostic criterion for compartment syndrome, mandating immediate fasciotomy.

Question 30

A 68-year-old female with severe genu varum undergoes total knee arthroplasty (TKA). Postoperatively, she complains of numbness and weakness in her foot, specifically difficulty with ankle dorsiflexion and eversion. What is the most likely iatrogenic nerve injury during TKA?





Explanation

The common peroneal nerve (a branch of the sciatic nerve) is the most frequently injured major nerve during total knee arthroplasty, especially in cases of significant preoperative genu varum deformity. Correction of the varus deformity during surgery can stretch the common peroneal nerve as it wraps around the fibular head, leading to neuropraxia or, rarely, neurapraxia. Its dysfunction manifests as foot drop (difficulty with ankle dorsiflexion) and impaired ankle eversion. The femoral and saphenous nerves are anterior and less commonly injured in TKA. The tibial nerve is posterior and less prone to stretch injury in varus correction.

Question 31

A 70-year-old active male presents with chronic insidious left hip pain. Radiographs show superior migration of the femoral head, joint space narrowing, and osteophytes. He desires pain relief and improved function. Which of the following is the most appropriate definitive surgical intervention?





Explanation

The patient's symptoms (chronic insidious hip pain, active lifestyle) and radiographic findings (superior migration, joint space narrowing, osteophytes) are classic for advanced hip osteoarthritis. For an active 70-year-old with disabling symptoms and end-stage arthritis, Total Hip Arthroplasty (THA) is the gold standard definitive surgical intervention, offering excellent pain relief and restoration of function. Hip arthroscopy is generally for younger patients with FAI or early arthritis. Core decompression is for AVN. Osteotomy is for younger patients with specific deformities. Arthrodesis is a salvage procedure, typically not for active elderly patients.

Question 32

A 12-year-old male sustains a Salter-Harris Type II fracture of the distal tibia. Which of the following statements regarding this fracture type and its potential complications is most accurate?





Explanation

A Salter-Harris Type II fracture involves the physis (growth plate) and extends into the metaphysis, sparing the epiphysis and articular cartilage. It is the most common type of physeal fracture and generally has a good prognosis for growth, provided adequate reduction and fixation are achieved, and the periosteal hinge remains intact. Type I is through the physis. Type III involves the physis and epiphysis (intra-articular). Type IV involves the physis, metaphysis, and epiphysis (intra-articular), carrying a higher risk of growth arrest and avascular necrosis. Type V is a crush injury of the physis with a very high risk of growth arrest. The description in option A is Type IV, C is Type III or IV, D is not a specific type, and E implies a Type I or II with an intact periosteal hinge but the reduction implies open reduction which is not always needed for type II.

Question 33

A 65-year-old male presents with severe right ankle pain and deformity after a twisting injury. Radiographs reveal a trimalleolar fracture. Which of the following is the most important component of the trimalleolar fracture to reduce anatomically to restore ankle stability and prevent post-traumatic arthritis?





Explanation

A trimalleolar fracture involves the lateral, medial, and posterior malleoli. While all three are important, the posterior malleolus is crucial for ankle stability. If the posterior fragment is large (typically >25-30% of the articular surface) or significantly displaced, it must be anatomically reduced and fixed to restore the ankle mortise's stability and concentric reduction of the talus, preventing posterior subluxation of the talus and subsequent post-traumatic arthritis. The lateral and medial malleoli also require fixation, but the posterior malleolus is often the overlooked critical component for stability and articular congruence. Ligament integrity is also crucial but refers to soft tissue rather than bony reduction.

Question 34

A 30-year-old male presents with recurrent episodes of shoulder dislocation. Examination reveals anterior apprehension with the arm in abduction and external rotation, and a palpable defect on the posterior aspect of the humeral head on MRI. This defect is known as a:





Explanation

The scenario describes recurrent anterior shoulder dislocation with an anterior apprehension sign. The defect on the posterior aspect of the humeral head, caused by impaction against the anterior inferior glenoid rim during dislocation, is known as a Hill-Sachs lesion. A Bankart lesion is an injury to the anterior inferior labrum and glenoid rim. A SLAP (Superior Labrum Anterior to Posterior) lesion involves the superior labrum. A reverse Bankart lesion is a posterior inferior labrum tear associated with posterior dislocation. Os acromiale is an unfused acromial apophysis.

Question 35

A 60-year-old patient presents with pain and deformity of the proximal humerus following a fall. Radiographs reveal a 3-part proximal humerus fracture. Which of the following factors is most important in determining whether to proceed with surgical fixation versus shoulder arthroplasty (hemiarthroplasty or reverse total shoulder arthroplasty)?





Explanation

For complex proximal humerus fractures (e.g., 3- or 4-part), the decision between fixation (ORIF) and arthroplasty is multifactorial, but age and bone quality are consistently among the most important determinants. In younger, active patients with good bone stock, ORIF is generally attempted. In elderly, osteoporotic patients with comminuted fractures where stable fixation is unlikely or bone healing is compromised, arthroplasty (hemiarthroplasty or reverse TSA) is often preferred. Risk of AVN is a consideration with fixation, but poor bone quality often precludes successful fixation in the first place. Rotator cuff tears are often associated and influence the choice between hemiarthroplasty and reverse TSA, but age and bone quality are more fundamental for the initial fixation vs. replacement decision.

Question 36

A 3-year-old child presents with a high fever, refusal to bear weight on the right leg, and extreme pain with passive range of motion of the right hip. Inflammatory markers (ESR, CRP) are significantly elevated. Which of the following is the most appropriate immediate diagnostic and therapeutic step?





Explanation

The presentation (high fever, refusal to bear weight, severe pain with passive ROM, elevated inflammatory markers) in a child is highly suspicious for septic arthritis of the hip, which is an orthopedic emergency. Delayed diagnosis and treatment can lead to rapid articular cartilage destruction, avascular necrosis, and growth disturbances. Therefore, immediate hip joint aspiration (to obtain fluid for culture and cell count) and initiation of empiric intravenous antibiotics are crucial. Radiographs are often normal early on. MRI can be helpful but should not delay aspiration and antibiotics. Oral antibiotics are insufficient. Physical therapy is contraindicated in acute septic arthritis.

Question 37

A 50-year-old female presents with progressive weakness and muscle atrophy in the deltoid and biceps after a motor vehicle accident that caused a clavicle fracture. Examination reveals diminished sensation over the lateral aspect of the shoulder. Which nerve root or peripheral nerve is most likely involved?





Explanation

Weakness of the deltoid and biceps, along with sensory loss over the lateral aspect of the shoulder, points to involvement of the C5 nerve root. The deltoid is primarily innervated by the axillary nerve (C5-C6), and the biceps by the musculocutaneous nerve (C5-C7). Both of these nerves derive significant input from C5. A clavicle fracture can cause brachial plexus injury, and C5 is a common component involved. The axillary nerve is a peripheral nerve, but the question asks about nerve root or peripheral nerve and C5 is the root level providing the most prominent motor and sensory deficits described.

Question 38

A 45-year-old patient with rheumatoid arthritis undergoes a cervical spine fusion. Postoperatively, she develops acute onset of difficulty swallowing (dysphagia) and a hoarse voice (dysphonia). Which of the following is the most likely cause?





Explanation

Dysphagia and dysphonia following anterior cervical spine surgery are relatively common complications, most frequently caused by pharyngeal/esophageal edema and/or recurrent laryngeal nerve neuropraxia due to prolonged retraction of soft tissues during the approach. While esophageal perforation is a serious but rare complication, and recurrent laryngeal nerve palsy can occur, edema from retraction is the most common cause of these symptoms. Spinal cord injury would present with more profound neurological deficits. Aspiration pneumonia is a consequence, not a primary cause of the dysphagia/dysphonia itself.

Question 39

A 60-year-old male with a history of prostate cancer, now with intractable back pain and bilateral leg weakness, is found to have a metastatic lesion compressing the thoracic spinal cord. He is neurologically intact below the lesion but has significant pain. Which of the following is the most appropriate initial management for this orthopedic oncology emergency?





Explanation

Acute spinal cord compression from metastatic disease is an orthopedic oncology emergency. The most appropriate initial management is the immediate initiation of high-dose corticosteroids (e.g., dexamethasone) to reduce peritumoral edema, which can rapidly improve neurological function and alleviate pain while further diagnostic workup and definitive treatment planning occur. While surgical decompression and radiation therapy are definitive treatments, corticosteroids provide rapid neuroprotection. Chemotherapy is systemic and not an immediate solution for acute cord compression. Bracing and PT are supportive, not primary for acute compression.

Question 40

A 28-year-old male sustains a severe open forearm fracture with significant soft tissue injury. He is taken to the operating room for debridement. Which of the following factors is most critical to guide the initial debridement and management of this open fracture to prevent infection and optimize healing?





Explanation

For open fractures, thorough and meticulous debridement – removing all devitalized (necrotic) tissue and foreign material – is the single most critical step to prevent infection and promote healing. This aligns with the 'severe trauma' and 'severe contamination' indications for prophylactic antibiotics, implying the need for aggressive debridement to reduce bacterial load. While pulsatile lavage is used, its pressure settings are debated, and the completeness of debridement is paramount. The choice of fixation is secondary to debridement. Duration of surgery and pain control are important but not as critical as thorough debridement for infection prevention in open fractures.

Question 41

A 40-year-old female presents with chronic lateral elbow pain, exacerbated by gripping and lifting. She has tenderness over the lateral epicondyle and reproduces pain with resisted wrist extension and forearm supination. Which of the following is the most likely diagnosis?





Explanation

The symptoms (chronic lateral elbow pain, tenderness over the lateral epicondyle, pain with resisted wrist extension and forearm supination) are classic for lateral epicondylitis, commonly known as 'tennis elbow.' This condition involves degeneration of the common extensor origin, primarily the extensor carpi radialis brevis tendon. Medial epicondylitis (golfer's elbow) involves the common flexor origin. Olecranon bursitis is swelling over the olecranon tip. Cubital tunnel syndrome is ulnar nerve compression. Distal biceps rupture causes weakness in supination and flexion with a visible deformity.

Question 42

A 55-year-old diabetic patient undergoes a total knee arthroplasty. Four months later, he develops fever, increasing knee pain, and swelling. Synovial fluid aspiration shows a WBC count of 80,000 cells/µL with 90% neutrophils, and Gram-positive cocci in clusters. Based on general principles, what is the most appropriate initial surgical management for this confirmed acute periprosthetic joint infection?





Explanation

For an acute periprosthetic joint infection (PJI) (symptoms <3-4 weeks duration) in a well-fixed prosthesis and an otherwise healthy patient, Irrigation and Debridement (I&D) with component retention (DAIR - Debridement, Antibiotics, Implant Retention) is the preferred initial surgical approach. This is followed by prolonged intravenous antibiotics. One-stage revision is considered for select, less virulent organisms or chronic infections in favorable hosts. Two-stage revision is the gold standard for chronic PJI or acute PJI with highly virulent organisms or compromised hosts. Aspiration with oral antibiotics is generally insufficient for established PJI. Arthrodesis is a salvage procedure for failed revisions. Given the 'acute' nature, I&D with retention is the appropriate first surgical step.

Question 43

A 1-year-old infant is diagnosed with a dislocated hip on routine screening examination. Ortolani and Barlow tests are positive. Radiographs confirm developmental dysplasia of the hip (DDH). Which of the following is the most appropriate initial management?





Explanation

For infants diagnosed with Developmental Dysplasia of the Hip (DDH), particularly those with a dislocated but reducible hip as indicated by positive Ortolani and Barlow tests, the Pavlik harness is the most appropriate initial management. It is a soft abduction brace that encourages hip flexion and abduction, allowing the hip to reduce spontaneously and stabilize. Open reduction is for older children or failed harness treatment. Observation is only for mild dysplasia. Osteotomy is a reconstructive procedure for older children. Physical therapy alone is insufficient.

Question 44

A 35-year-old male sustains a high-energy tibial plateau fracture (Schatzker VI). Initial resuscitation and external fixation are performed. He is at high risk for complications. Which of the following is not considered a specific acute complication frequently associated with high-energy tibial plateau fractures?





Explanation

High-energy tibial plateau fractures, especially Schatzker VI, are associated with numerous acute complications due to the significant trauma and proximity to neurovascular structures and soft tissue compromise. These include compartment syndrome, popliteal artery injury, DVT, and associated meniscal or ligamentous injuries. However, avascular necrosis of the femoral head is a complication of hip pathology (e.g., femoral neck fractures, hip dislocations) and is not directly associated with tibial plateau fractures. Avascular necrosis of the tibial condyle can occur but is rare, and the question specifically mentions the femoral head.

Question 45

A 70-year-old male with chronic lumbar radiculopathy due to severe spinal stenosis undergoes a lumbar laminectomy. Postoperatively, he develops a cerebrospinal fluid (CSF) leak from the surgical site. Which of the following is the most appropriate immediate management strategy?





Explanation

Small, iatrogenic cerebrospinal fluid (CSF) leaks (durotomies) following lumbar spine surgery are common. The most appropriate initial management for an uncomplicated, small CSF leak without signs of infection or neurological deficit is typically conservative: bed rest (often flat or Trendelenburg to reduce CSF pressure at the leak site), head elevation for other types of leaks, and close observation. Many small leaks seal spontaneously. Surgical exploration is reserved for large leaks, those failing conservative management, or those with significant neurological compromise or persistent wound drainage. A lumbar drain might be used as an adjunct to conservative care or before re-operation but is not always the first step. Antibiotics are not routinely given unless there's an infection. Bracing is generally not specific for CSF leaks.

Question 46

A 55-year-old male presents with severe foot pain, erythema, swelling, and warmth, primarily affecting the first metatarsophalangeal (MTP) joint. He has a history of poorly controlled hypertension and kidney stones. Aspiration of the joint reveals negatively birefringent needle-shaped crystals. What is the most likely diagnosis?





Explanation

The clinical presentation (acute, severe pain, erythema, swelling of the first MTP joint - 'podagra'), patient history (hypertension, kidney stones, often associated with hyperuricemia), and synovial fluid analysis showing negatively birefringent needle-shaped crystals are pathognomonic for gout. Septic arthritis would show a high WBC count and positive cultures. Pseudogout (CPPD) shows positively birefringent rhomboid-shaped crystals. Rheumatoid arthritis is typically polyarticular and chronic. Cellulitis would not have crystals on aspiration.

Question 47

A 45-year-old male presents with left foot drop and numbness over the dorsal aspect of his foot and lateral calf. He denies any recent trauma. On examination, he has weakness of ankle dorsiflexion and eversion. Which of the following conditions is the most likely cause of his symptoms?





Explanation

Foot drop (weakness of ankle dorsiflexion and eversion) with sensory loss over the dorsal foot and lateral calf is the classic presentation of common peroneal nerve dysfunction. The most common site of compression or entrapment of the common peroneal nerve is around the fibular head, where it is superficial and vulnerable. Sciatic nerve compression would cause more widespread deficits. Sural nerve is purely sensory. L5 radiculopathy could cause similar motor deficits but often involves more proximal pain and potentially weakness of gluteus medius/minimus. Tibial nerve entrapment (tarsal tunnel syndrome) affects sensation on the sole of the foot and intrinsic foot muscles.

Question 48

A 70-year-old female with advanced primary bone lymphoma of the proximal femur requires surgical intervention. According to general 'tumor surgery principles,' which of the following statements regarding the role of biopsy is most accurate?





Explanation

For bone tumors, the biopsy tract is considered contaminated with tumor cells and must be resected en bloc with the definitive specimen to avoid local recurrence. Therefore, the biopsy incision should be carefully planned and ideally placed in line with the planned definitive surgical incision, so the entire biopsy tract can be excised. This aligns with the 'tumor surgery principles' of preventing tumor cell shedding and local recurrence. An excisional biopsy is inappropriate for suspected malignancies. Biopsy is essential for diagnosis regardless of treatment plan. Frozen section provides preliminary information, but definitive diagnosis requires permanent sections. Biopsy is often necessary in weight-bearing bones, and risk of fracture is managed with post-biopsy precautions.

Question 49

A 25-year-old male sustains a severe open fracture of the calcaneus (Gustilo IIIC) after a fall. He also has a pelvic fracture and significant blood loss. Which 'general monitoring' parameter from the surgical shock guidelines would be the first to indicate hypovolemic shock and warrant immediate intervention?





Explanation

In hypovolemic shock, compensatory mechanisms lead to tachycardia as the first physiological response to maintain cardiac output in the face of decreased intravascular volume. Blood pressure is often maintained until more significant volume loss (approximately 30%) due to peripheral vasoconstriction. Mental status changes, decreased urine output, and cool/clammy skin appear as shock progresses. Therefore, 'pulse monitoring' (tachycardia) is typically the earliest clinical sign, as noted in the general monitoring guidelines for surgical shock ('pulse monitoring').

Question 50

A 60-year-old female undergoes revision total hip arthroplasty due to aseptic loosening of the acetabular component. Given her age and the complexity of the procedure, which of the following infection risk factors, aligned with general prophylactic antibiotic indications, is most relevant for administering prophylactic antibiotics?





Explanation

The most directly relevant indication for prophylactic antibiotics here, from the provided general medical principles, is: '(3) Procedures involving artificial implants, such as joint, vascular, and heart valve replacements, and artificial material repair of abdominal wall hernias.' The placement of new artificial components in a revision arthroplasty is a prime indication. While long surgery duration and age can be contributing factors, the presence of the implant itself is a specific and strong indication for prophylaxis in orthopedic surgery. The size of incision or need for transfusion are less direct indications for prophylaxis compared to the implant itself.

Question 51

A 30-year-old female presents with a new onset, rapidly growing mass in her proximal tibia. Biopsy confirms a high-grade osteosarcoma. According to the 'tumor surgery principles,' which of the following statements regarding the initial surgical plan is most aligned with current oncologic practice?





Explanation

For high-grade osteosarcomas, the standard of care involves neoadjuvant (preoperative) chemotherapy to downstage the tumor, treat micrometastases, and assess tumor response, followed by limb-sparing wide resection with clear margins. This approach balances oncologic control with functional preservation, aligning with the core tumor surgery principles of complete tumor removal while considering systemic disease. Immediate wide excision without neoadjuvant therapy can miss micrometastases and has a higher risk of local recurrence. Amputation is a salvage option. Intralesional excision is inadequate for high-grade sarcomas. Radiation is rarely curative for osteosarcoma alone.

Question 52

A 72-year-old male with a history of chronic kidney disease and heart failure is scheduled for a hip fracture repair. According to the general principles, which of the following is the most critical consideration for preventing postoperative acute renal failure, referencing the provided mechanisms?





Explanation

In a patient with pre-existing comorbidities like chronic kidney disease and heart failure, 'renal ischemia' is a major contributor to acute renal failure. Therefore, meticulous maintenance of euvolemia (avoiding both dehydration and fluid overload) and stable hemodynamics (maintaining adequate blood pressure and perfusion) throughout the perioperative period is paramount to prevent further renal injury from hypoperfusion or congestion. Aggressive diuresis could worsen hypovolemia. NSAIDs should indeed be avoided, but maintaining hemodynamics is more encompassing. Preoperative dialysis might be necessary if the patient is uremic but is not a routine preventive measure for all CKD patients. Vitamin D is not relevant to acute renal failure prevention.

Question 53

A 60-year-old active male is diagnosed with a small, contained lumbar disc herniation (L4-L5) causing chronic L5 radiculopathy. He has failed extensive conservative management including physical therapy and epidural steroid injections. Which of the following surgical procedures is generally considered the gold standard for treating this condition?





Explanation

For a contained lumbar disc herniation causing radiculopathy that has failed conservative management, minimally invasive microdiscectomy is considered the gold standard. It is a highly effective procedure for decompressing the nerve root, offering high success rates, rapid recovery, and minimal tissue disruption. Lumbar fusion is reserved for instability or severe degenerative conditions. Total disc replacement is for specific cases of discogenic pain without significant facet arthritis. Laminectomy with facetectomy is typically for more extensive stenosis. Percutaneous nucleoplasty has limited indications and less robust efficacy for significant herniations.

Question 54

A 25-year-old male sustains a Gustilo IIIA open tibia fracture. He is managed with surgical debridement and external fixation. According to the general principles of prophylactic antibiotic use, what is the typical duration for prophylactic antibiotics in this scenario?





Explanation

For Gustilo Type I and II open fractures, 24 hours of prophylactic antibiotics post-surgery is generally sufficient. However, for Gustilo Type III open fractures (IIIA, IIIB, IIIC), a longer course of 3-5 days is typically recommended, or until definitive wound closure, to reduce the risk of deep infection due to the extensive soft tissue damage and contamination. A single preoperative dose or 24 hours is insufficient for Type III. Until wound closure is often the practical endpoint, but 3-5 days is the typical duration for type III if delayed closure is planned. 6 weeks is for established osteomyelitis.

Question 55

A 68-year-old male with long-standing rheumatoid arthritis presents with progressive cervical myelopathy and signs of atlantoaxial instability. Which of the following radiological findings is the most critical for surgical planning of cervical fusion?





Explanation

In patients with rheumatoid arthritis and suspected atlantoaxial instability, the Atlanatodental Interval (ADI) on flexion/extension radiographs (or dynamic CT/MRI) is the most critical measurement. An ADI >3 mm (in adults) or >5 mm (in children) indicates instability of the atlantoaxial joint and can necessitate surgical fusion, especially if accompanied by neurological symptoms. While T2 signal changes indicate myelopathy and pannus formation is characteristic of RA, the ADI directly quantifies the instability requiring surgical intervention. Subaxial kyphosis and C3-C4 degeneration are important but not as critical for atlantoaxial instability specifically.

Question 56

A 50-year-old male presents with chronic foot pain, progressive flatfoot deformity, and difficulty with heel rise. On examination, he has tenderness and swelling along the medial ankle, and a 'too many toes' sign. Which of the following tendons is most likely dysfunctional?





Explanation

The symptoms (chronic foot pain, progressive flatfoot deformity, difficulty with heel rise, medial ankle tenderness, and 'too many toes' sign) are classic for Posterior Tibial Tendon Dysfunction (PTTD), often progressing to adult acquired flatfoot deformity. The posterior tibial tendon is a primary stabilizer of the medial longitudinal arch. Achilles tendon pathology causes different symptoms. Peroneus longus is involved in lateral foot stability. The other tendons have different primary functions.

Question 57

Which of the following describes the fundamental principle of 'unsectional principle' in tumor surgery, as outlined in the provided general medical content, when applied to musculoskeletal oncology?





Explanation

The 'unsectional principle' (or 'not cutting principle') in tumor surgery, as described, dictates that 'the tumor tissue should not be cut directly during surgery, but should be dissected from the periphery to the center.' This means avoiding any direct incision into the tumor mass itself to prevent tumor cell spillage and local recurrence. While excising with wide margins is the goal of definitive resection, the unsectional principle specifically refers to avoiding direct incision into the tumor during the dissection phase. Biopsy is typically incisional or core needle. Limb salvage and neoadjuvant therapy are broader concepts in oncologic management.

Question 58

A 6-year-old child sustains a supracondylar humerus fracture (Gartland Type III) after falling from monkey bars. Which of the following complications is most critical to monitor for immediately post-reduction and fixation due to the high-energy nature of the injury and the anatomical vulnerability?





Explanation

Gartland Type III supracondylar humerus fractures are high-energy injuries with significant displacement and swelling, placing the child at high risk for vascular compromise and compartment syndrome. Volkmann's ischemic contracture, resulting from brachial artery injury or forearm compartment syndrome, is the most critical immediate complication to monitor for, leading to severe permanent deformity and functional loss. Cubitus varus is a common malunion but not an acute critical complication. Ulnar nerve palsy is possible but less common than median/radial nerve injury or vascular compromise. Pin site infection is a minor complication compared to Volkmann's.

Question 59

A 40-year-old male sustains an Achilles tendon rupture. Physical examination reveals a palpable gap in the tendon and a positive Thompson test. He opts for non-operative management. Which of the following is the most important component of non-operative management to optimize healing and minimize re-rupture risk?





Explanation

For Achilles tendon rupture, both operative and non-operative management aim for functional recovery. Non-operative treatment involves early functional rehabilitation with progressive weight-bearing and controlled range of motion in a functional brace or boot, typically starting with the ankle in plantarflexion and gradually progressing to neutral. This approach has been shown to optimize tendon healing, reduce atrophy, and minimize re-rupture rates compared to prolonged rigid immobilization. Immediate full weight-bearing is too aggressive. Prolonged rigid immobilization leads to stiffness and atrophy. Steroid injections are contraindicated due to rupture risk. NSAIDs are for pain control, not primary healing.

Question 60

A 60-year-old female presents with severe pain and functional limitations due to advanced hallux rigidus (osteoarthritis of the first metatarsophalangeal joint). She desires a definitive surgical solution. Which of the following is the most appropriate surgical option for her condition?





Explanation

For advanced hallux rigidus (Grade III/IV), especially in an older patient with severe pain and functional limitation, arthrodesis (fusion) of the first metatarsophalangeal (MTP) joint is considered the gold standard. It provides excellent pain relief, stable weight-bearing, and predictable long-term results by eliminating motion at the painful joint. Cheilectomy is for earlier stages (Grade I/II). Bunionectomy and distal metatarsal osteotomy are for hallux valgus (bunion deformity). Keller arthroplasty is a salvage procedure with higher rates of metatarsalgia and instability.

Question 61

A 30-year-old male sustains a traumatic anterior hip dislocation. Following closed reduction, which of the following is the most critical and immediate post-reduction assessment and management step to prevent long-term complications?





Explanation

After closed reduction of a traumatic hip dislocation, the most critical immediate step is to confirm concentric reduction radiographically and rule out any incarcerated fragments or associated fractures, particularly of the femoral head or acetabulum, with a post-reduction CT scan. Failure to identify and address these can lead to recurrent dislocation, avascular necrosis (AVN) of the femoral head, and post-traumatic arthritis. Early physical therapy is usually started after initial healing. Bed rest is not typically indicated for hip dislocation. Prophylactic antibiotics are not routinely indicated. Arthroscopy is usually not part of the immediate post-reduction assessment unless open reduction is required or there's ongoing concern for labral/chondral injury after confirming concentric reduction.

Question 62

A 70-year-old patient with multiple comorbidities is scheduled for an elective total hip arthroplasty. According to general prophylactic antibiotic guidelines, which of the following is an independent high-risk factor for surgical site infection that warrants careful preoperative optimization, beyond the standard indication of implant placement?





Explanation

According to the general medical content, high-risk factors for infection include: '(4) Patients with high-risk factors for infection, such as advanced age, malnutrition, diabetes, granulocytopenia; or those undergoing steroid, immunosuppressant, or anticancer drug therapy, and those with immune dysfunction requiring surgery.' Diabetes mellitus, even if well-controlled, significantly increases the risk of surgical site infection and requires careful preoperative glucose optimization. While age >70 and history of prior surgery (especially if infected) are risk factors, diabetes is explicitly listed as a 'high-risk factor' relevant to systemic immunity. A BMI of 28 is overweight but not obese enough to be a high-risk factor by itself.

Question 63

A 55-year-old female presents with persistent pain and stiffness in her right wrist after a fall 6 months ago. Radiographs show scapholunate advanced collapse (SLAC wrist) with significant degenerative changes. She is active and desires maximal pain relief and functional restoration. Which of the following surgical options is most appropriate for her condition?





Explanation

For advanced SLAC wrist with significant degenerative changes (often Stage II or III), a four-corner fusion (fusion of the capitate, hamate, triquetrum, and lunate) with scaphoid excision is a well-established and reliable procedure. It provides excellent pain relief while preserving some wrist motion. Scaphoid nonunion fixation would be for an acute nonunion. Wrist arthroscopy is for early arthritis. Proximal row carpectomy can be an option, but fusion is often preferred in active patients requiring more predictable pain relief and stability. Total wrist arthroplasty is reserved for older, low-demand patients due to concerns about wear and loosening.

Question 64

A 14-year-old male presents with chronic anterior knee pain, a prominent and tender bump at the tibial tubercle, exacerbated by sports activities. What is the most likely diagnosis?





Explanation

The patient's presentation (chronic anterior knee pain, prominent and tender tibial tubercle, exacerbated by sports in an adolescent male) is classic for Osgood-Schlatter disease. This condition is an apophysitis of the tibial tubercle due to repetitive traction of the patellar tendon on the developing growth plate. Sinding-Larsen-Johansson syndrome is similar but affects the inferior pole of the patella. Patellofemoral pain syndrome causes pain around or behind the patella, without a prominent tubercle. Patellar tendinopathy affects older adolescents or adults. Plica syndrome is less common and causes pain with knee flexion/extension.

Question 65

A 60-year-old patient with an unresectable chordoma of the sacrum is experiencing severe, intractable pain. The general 'tumor surgery principles' emphasize avoiding cutting the tumor, but in cases of palliation, what is a primary goal of any intervention?





Explanation

While the fundamental tumor surgery principles aim for curative resection with negative margins, in the context of an unresectable tumor like a chordoma of the sacrum causing intractable pain, the primary goal of any intervention shifts to palliation. This means focusing on improving the patient's quality of life by alleviating pain and maintaining function (e.g., through debulking, stabilization, or radiation therapy). Complete eradication is not feasible in an unresectable tumor. Preventing all metastases is unrealistic. Maximizing life expectancy at the expense of quality of life may not be the patient's goal.

Question 66

A 45-year-old male sustains a complete tear of the distal biceps tendon. He has significant weakness in forearm supination and elbow flexion. Which of the following is the most appropriate management for this injury in an otherwise healthy and active individual?





Explanation

For active individuals with a complete rupture of the distal biceps tendon, open surgical repair with reattachment to the radial tuberosity is the gold standard. This restores supination strength and elbow flexion power, which are significantly compromised with non-operative management. Conservative management leads to permanent weakness. Percutaneous repair can be less robust than open repair. Delayed repair after 6 weeks becomes more challenging due to tendon retraction and scarring. Activity modification and NSAIDs are not treatments for a complete rupture.

Question 67

A 70-year-old male develops a septic olecranon bursitis. He has no systemic signs of infection. Which of the following is the most appropriate initial management?





Explanation

For suspected septic olecranon bursitis without systemic signs of infection, the initial management typically involves aspiration of the bursa to confirm the diagnosis (Gram stain, cell count, culture) and initiation of empiric oral antibiotics covering common skin flora (e.g., Staphylococcus aureus). If the infection is severe, unresponsive to oral antibiotics, or if there are systemic signs, intravenous antibiotics and potentially surgical debridement/excision may be required. Steroid injection is contraindicated in septic bursitis. Surgical excision is usually reserved for chronic, recurrent, or refractory cases. IV antibiotics and immobilization might be too aggressive as initial management without systemic signs.

Question 68

A 30-year-old female presents with a several-month history of right posterior ankle pain, exacerbated by push-off during walking and running. On examination, she has tenderness over the posterior aspect of the Achilles tendon, approximately 2-6 cm proximal to its insertion. What is the most likely diagnosis?





Explanation

The location of pain (2-6 cm proximal to insertion) is characteristic of non-insertional (mid-portion) Achilles tendinopathy, which is the most common form of Achilles tendon pain. Insertional tendinopathy occurs at the tendon's attachment to the calcaneus. Retrocalcaneal bursitis is pain anterior to the Achilles tendon at the superior calcaneal tuberosity. Haglund's deformity is a bony prominence causing pain, often at the insertion. Achilles rupture presents with acute pain, a palpable gap, and a positive Thompson test.

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