+967-774203774 [email protected]
Partner Portal Staff Login
العربية
Part of the Master Guide

2018 Graduate Professional Course Exam Questions: Pass with Confidence

Orthopedic Board Prep: Interactive MCQ Exam Engine & Study Tool

23 Apr 2026 120 min read 75 Views
Chinese graduating exam5

Key Takeaway

Our Orthopedic Board Prep platform offers an interactive MCQ engine with dedicated Study and Exam Modes to simulate real test conditions. Users can track scores, review detailed explanations for correct and incorrect answers, and focus on high-yield topics like complex orthopedic trauma and associated injuries, enhancing exam readiness.

Comprehensive Exam


00:00

Start Quiz

Question 1

A 45-year-old male presents to the emergency department after a high-energy motor vehicle accident. He has a comminuted pelvic ring injury involving the pubic symphysis and right sacroiliac joint, classified as an APC III. On initial evaluation, he is hypotensive, tachycardic, and has gross hematuria with a high-riding prostate on digital rectal examination. What is the most appropriate initial management step for his suspected urological injury after initial resuscitation?





Explanation

The patient's presentation with a high-energy pelvic fracture, gross hematuria, and a high-riding prostate strongly suggests a posterior urethral injury. In such cases, urethral instrumentation with a Foley catheter is contraindicated until a retrograde urethrogram (RUG) has been performed to rule out or characterize the urethral injury. Attempting to insert a Foley catheter blindly can convert a partial tear into a complete tear or create a false passage, worsening the injury. If a urethral injury is confirmed and Foley insertion is not possible, a suprapubic catheter is the preferred method for bladder drainage. Open surgical exploration for bladder repair or IVP are not initial management steps for suspected urethral injury.

Question 2

A 68-year-old male with a history of prostate cancer status post prostatectomy presents with increasing left shoulder pain and weakness for the past three months. X-rays show a lytic lesion in the proximal humerus. Laboratory tests reveal elevated serum calcium. What is the most appropriate next step in management?





Explanation

Given the patient's history of prostate cancer and a new lytic lesion with hypercalcemia, metastatic disease to the humerus is highly suspected. While radiation and surgical fixation may be part of the treatment plan, a definitive diagnosis through biopsy is crucial to confirm metastasis and guide subsequent oncological management. Elevated serum calcium also suggests bone involvement. NSAIDs and physiotherapy are insufficient for a suspected malignancy. Immediate chemotherapy without definitive diagnosis is not standard practice.

Question 3

A 35-year-old male presents with a T10 burst fracture after a fall from height. He has a neurological deficit corresponding to an ASIA C injury. Initial assessment reveals stable vital signs but diminished breath sounds at the lung bases. What is the most critical immediate respiratory concern related to a T10 spinal cord injury?





Explanation

A T10 spinal cord injury typically spares the phrenic nerve (C3-C5), so diaphragmatic function is generally preserved. However, the intercostal muscles, innervated by T1-T11, are significantly weakened or paralyzed at this level. This compromises the patient's ability to take deep breaths and effectively clear secretions through coughing, leading to atelectasis, pneumonia, and hypoventilation. While other respiratory issues can occur, intercostal muscle weakness is the most direct and common respiratory complication of a thoracic spinal cord injury at this level. Phrenic nerve paralysis is seen with higher cervical injuries. Bronchospasm, ARDS, and hemothorax are less directly and universally linked to a T10 SCI itself in this scenario without further evidence.

Question 4

A 22-year-old male sustains a right-sided scapular fracture and multiple concomitant rib fractures (ribs 4-8) after a motorcycle collision. He is hypotensive, tachycardic, and has paradoxical chest wall motion on the right. Auscultation reveals absent breath sounds on the right. What is the most immediate life-threatening thoracic injury that requires urgent intervention?





Explanation

The patient's presentation with hypotension, tachycardia, absent breath sounds on the right, and paradoxical chest wall motion (suggesting flail chest) in the setting of severe trauma points to a tension pneumothorax as the most immediate life-threatening thoracic injury. Flail chest itself is a severe injury causing paradoxical motion and impaired ventilation, and pulmonary contusion causes respiratory compromise, but a tension pneumothorax rapidly compromises venous return to the heart and lung function, leading to shock. A simple pneumothorax or hemothorax might present with absent breath sounds but typically without the profound hemodynamic instability and mediastinal shift characteristic of tension pneumothorax. A tension pneumothorax requires immediate needle decompression followed by chest tube insertion.

Question 5

A 72-year-old male presents with severe lower back pain, fever, and progressive bilateral leg weakness. He has a history of poorly controlled diabetes and a recent urinary tract infection. MRI of the lumbar spine reveals an epidural abscess extending from L2 to L4 with significant spinal cord compression. What is the most appropriate definitive management strategy?





Explanation

Given the patient's progressive neurological deficits (bilateral leg weakness) and evidence of significant spinal cord compression from an epidural abscess, urgent surgical decompression and debridement are indicated to prevent irreversible neurological damage. Intravenous antibiotics are crucial but insufficient alone due to the mass effect. Percutaneous drainage may be considered for smaller, non-compressive abscesses, but with neurological compromise, surgical decompression is paramount. Corticosteroids are generally not recommended in spinal epidural abscesses as they can mask symptoms and potentially worsen infection. Brace immobilization and observation are inappropriate for a rapidly progressing neurological deficit.

Question 6

Which of the following conditions is most likely to present with shoulder pain and Horner's syndrome due to apical lung tumor involvement?





Explanation

A Pancoast tumor is an apical lung tumor that can invade the brachial plexus (causing shoulder and arm pain), ribs, and sympathetic chain (leading to Horner's syndrome: ptosis, miosis, anhidrosis). While the other conditions can cause shoulder pain, only a Pancoast tumor specifically accounts for the combination of shoulder pain and Horner's syndrome in this context. Cervical radiculopathy would cause dermatomal/myotomal pain and weakness, but not Horner's syndrome. Thoracic outlet syndrome involves neurovascular compression but typically lacks Horner's syndrome.

Question 7

A 60-year-old male undergoes an anterior lumbar interbody fusion (ALIF) at L4-L5. Postoperatively, he develops abdominal distension, absent bowel sounds, and is unable to void, requiring Foley catheterization. Which of the following is the most likely cause of his urinary retention and paralytic ileus?





Explanation

Anterior lumbar interbody fusion (ALIF) involves a retroperitoneal approach, requiring mobilization of great vessels and manipulation of the anterior longitudinal ligament. This manipulation can temporarily injure or irritate the sympathetic nerve fibers and the superior hypogastric plexus, leading to transient autonomic dysfunction manifesting as paralytic ileus and urinary retention. While retrograde ejaculation is a known, more specific, and often permanent complication of superior hypogastric plexus injury during ALIF in males, generalized transient autonomic dysfunction encompassing both ileus and urinary retention is a more common immediate postoperative issue. Femoral nerve injury is less common with a proper ALIF approach. Spinal cord injury is very unlikely at the lumbar level in an ALIF. A UTI can cause urinary retention, but not typically directly cause paralytic ileus concurrently as an immediate post-op complication of this type of surgery.

Question 8

A 16-year-old female presents with progressive scoliosis, exhibiting a 55-degree thoracic curve (T5-T12). Her pulmonary function tests show a forced vital capacity (FVC) of 60% of predicted. What is the primary concern regarding her respiratory function in the long term without intervention?





Explanation

Severe scoliosis, particularly thoracic curves exceeding 50-60 degrees, can significantly restrict chest wall and lung expansion. This leads to a restrictive ventilatory defect, characterized by reduced lung volumes (like FVC). Over time, this can progress to chronic respiratory insufficiency and, in severe cases, pulmonary hypertension and cor pulmonale (right heart failure due to lung disease). While pulmonary hypertension can be a late complication, restrictive lung disease is the primary and direct impact on lung function. Asthma is not directly caused by scoliosis. Diaphragmatic paralysis is unrelated. Obstructive lung disease involves airflow limitation, which is not the primary issue in scoliosis.

Question 9

A 50-year-old male with a T6 complete spinal cord injury (SCI) develops a pounding headache, profuse sweating above the level of injury, and severe hypertension during routine bladder catheterization. What is the most likely diagnosis?





Explanation

This constellation of symptoms (pounding headache, sweating above injury, severe hypertension) in an SCI patient, especially from T6 and above, triggered by a noxious stimulus below the level of injury (bladder catheterization in this case), is classic for autonomic dysreflexia. This is a medical emergency that can lead to stroke, myocardial infarction, or seizure. Vasovagal syncope involves bradycardia and hypotension. Spinal shock is a transient physiological state immediately following SCI, characterized by flaccid paralysis and loss of reflexes. Malignant hyperthermia is a rare anesthetic complication. Pulmonary embolism has different clinical features.

Question 10

A 30-year-old male presents after a severe fall, sustaining multiple rib fractures and a displaced sternal fracture. His chest X-ray shows a widened mediastinum and CT reveals a suspicious finding adjacent to the aorta. What is the most critical immediate concern regarding the sternal fracture?





Explanation

While cardiac contusion is a significant concern with sternal fractures, and pneumothorax/hemothorax can occur with rib fractures, a widened mediastinum on chest X-ray in the context of high-energy trauma strongly suggests a major vascular injury, particularly to the aorta. A displaced sternal fracture, especially when combined with a widened mediastinum, increases the suspicion for an aortic injury. This is an immediate life-threatening condition requiring urgent diagnosis and intervention. Tracheal injury is possible but less likely to present with a widened mediastinum compared to aortic injury.

Question 11

Which of the following is a common orthopedic manifestation of renal osteodystrophy in a patient with chronic kidney disease?





Explanation

Renal osteodystrophy is a complex bone disease that occurs in patients with chronic kidney disease (CKD). It encompasses several bone disorders, including osteomalacia (impaired mineralization), secondary hyperparathyroidism (high bone turnover), and adynamic bone disease (low bone turnover). These conditions lead to bone pain, fractures, and muscle weakness. Gout, pseudogout, rheumatoid arthritis, and septic arthritis are not primary orthopedic manifestations of renal osteodystrophy, although patients with CKD may suffer from them independently. Among the choices, osteomalacia and adynamic bone disease are direct components of renal osteodystrophy.

Question 12

A 65-year-old male presents with persistent upper back pain for 6 months. He has a history of smoking and chronic obstructive pulmonary disease (COPD). X-rays show vertebral body collapse at T8. What is the most important initial investigation to rule out a pathological fracture?





Explanation

While a BMD scan is important for osteoporosis assessment and ESR/CRP for infection, and tumor markers could be relevant if a specific cancer is suspected, the most important initial investigation to differentiate an osteoporotic compression fracture from a pathological fracture (e.g., metastatic disease or infection) in a patient with a smoking history (lung cancer risk) and chronic back pain is an MRI of the thoracic spine with contrast. MRI can accurately visualize soft tissue abnormalities, spinal cord compression, and differentiate benign from malignant or infectious causes of vertebral collapse, which plain X-rays cannot. A CT scan of chest/abdomen/pelvis may be part of a full metastatic workup if malignancy is highly suspected, but MRI directly addresses the vertebral lesion.

Question 13

A 40-year-old male presents with right shoulder and arm pain, numbness in the C8-T1 distribution, and weakness of intrinsic hand muscles. He reports his symptoms worsen with overhead activities. Physical exam reveals tenderness over the supraclavicular fossa and a positive Adson's test. Which of the following is the most likely diagnosis?





Explanation

The constellation of shoulder/arm pain, C8-T1 numbness, intrinsic hand muscle weakness, worsening with overhead activities, and a positive Adson's test (suggesting subclavian artery compression) is highly indicative of neurogenic thoracic outlet syndrome. This condition involves compression of the brachial plexus and/or subclavian vessels as they pass through the thoracic outlet. Cervical disc herniation can mimic some symptoms but Adson's test is specific to TOS. Rotator cuff tears do not cause neurological deficits in the hand. Pancoast tumor can present with C8-T1 symptoms, but less commonly with relief from specific positioning or a positive Adson's test. Carpal tunnel syndrome affects median nerve distribution, not C8-T1.

Question 14

A 55-year-old male with a history of intravenous drug use and recent pneumonia presents with new-onset severe back pain, fevers, and constitutional symptoms. Physical exam reveals paraspinal tenderness and a palpable mass in the right flank. MRI shows a large right psoas abscess originating from a T12-L1 spondylodiskitis. What is the most likely initial source of infection?





Explanation

In a patient with intravenous drug use, pneumonia, and spondylodiskitis with a psoas abscess, endocarditis is a very common source of hematogenous spread to the spine. The bacteria (often Staphylococcus aureus) can seed the vertebral bodies. While UTI is a common source for spinal infections, and direct inoculation from drug use is possible (e.g., skin flora), endocarditis provides a systemic source that readily disseminates to the spine. GI perforation would be more likely to cause an intra-abdominal abscess rather than primary spondylodiskitis with secondary psoas involvement. Tuberculosis is a possibility but less likely in the context of acute pneumonia and IV drug use compared to endocarditis.

Question 15

A patient undergoes a posterior approach for a T8-T9 spinal fusion. Postoperatively, they develop significant atelectasis and have difficulty clearing secretions. Which of the following factors contributes most significantly to postoperative pulmonary complications in thoracic spine surgery?





Explanation

Postoperative pain, particularly from thoracic spine surgery, significantly limits a patient's ability to take deep breaths and cough effectively (pain-induced splinting). This leads to decreased lung volumes, atelectasis, and retention of secretions, predisposing to pneumonia. While the other options can contribute to pulmonary complications, pain-induced splinting directly impairs the mechanics of breathing and cough, making it a primary and common factor after thoracic spine surgery. The posterior approach to the thoracic spine does not typically impair diaphragmatic function. Pre-existing cardiac disease and blood loss are general surgical risks, not specific to the mechanism of pulmonary dysfunction after thoracic spine surgery.

Question 16

A 70-year-old male is admitted for a hip fracture after a fall. He has a history of benign prostatic hyperplasia (BPH) and is scheduled for surgery. To minimize the risk of postoperative urinary retention, what is the most appropriate preoperative consideration?





Explanation

Patients with BPH are at increased risk for postoperative urinary retention due to multifactorial reasons including anesthesia, pain medications, and immobility. The most appropriate preoperative consideration is to assess their baseline urinary symptoms (e.g., frequency, nocturia, hesitancy, incomplete emptying). For those with significant symptoms, a trial of voiding before surgery or even prophylactic catheterization might be considered, or careful monitoring post-op. Delaying urgent hip fracture surgery or performing a prostatectomy or initiating alpha-blockers acutely are generally not practical or safe for immediate preoperative management of a hip fracture. Strict fluid restriction is usually discouraged as it can lead to dehydration.

Question 17

Which type of pelvic fracture is most commonly associated with urethral injury in males?





Explanation

Straddle fractures, involving bilateral fractures of the pubic rami (often from direct perineal trauma or falls onto hard objects), are strongly associated with urethral injuries in males, particularly posterior urethral disruption. The significant displacement of the pubic symphysis can shear the urethra. While any high-energy pelvic fracture can be associated with urethral injury, straddle fractures carry a particularly high risk. APC I and LC I are relatively stable and less prone to major urogenital trauma. Vertical shear fractures involve significant displacement but the direct force on the perineum is less pronounced than with a straddle mechanism for urethral injury.

Question 18

A 32-year-old male presents with right shoulder pain, paresthesias in the medial forearm and hand, and a palpable mass in the supraclavicular fossa. Further workup reveals a cervical rib. Compression of which neurovascular structure is most likely causing the patient's symptoms?





Explanation

A cervical rib typically compresses the lower trunk of the brachial plexus (C8, T1 roots) and the subclavian artery as they pass through the thoracic outlet. This compression leads to symptoms in the medial forearm and hand (ulnar nerve distribution), weakness of intrinsic hand muscles, and potentially vascular symptoms such as diminished radial pulse or pallor. The radial, ulnar, median, and long thoracic nerves are individual nerves that may be affected by specific conditions, but the overall presentation with a cervical rib points to compression of the broader neurovascular bundle, specifically the lower trunk of the brachial plexus and subclavian artery at the thoracic outlet.

Question 19

What is the primary orthopedic complication associated with an untreated symptomatic pectus excavatum?





Explanation

Severe pectus excavatum, a congenital deformity of the sternum and costal cartilages leading to a sunken chest, can cause compression of the heart and lungs. This compression can lead to compromised cardiopulmonary function, including reduced exercise tolerance, shortness of breath, and in severe cases, mitral valve prolapse or arrhythmias due to cardiac displacement. While scoliosis can coexist or be exacerbated by pectus excavatum, the primary concern directly attributable to the pectus deformity itself, particularly if symptomatic, is the impact on the heart and lungs. Rib fractures, osteoporosis, and patellar instability are not direct complications of pectus excavatum.

Question 20

A 60-year-old male with chronic back pain and stiffness, especially in the morning, presents with progressively worsening dysphagia. Radiographs show extensive flowing osteophytes along the anterior aspect of the thoracic spine. Which condition is most likely responsible for his symptoms?





Explanation

The patient's presentation with chronic back pain, stiffness, extensive flowing osteophytes along the anterior thoracic spine, and dysphagia is classic for Diffuse Idiopathic Skeletal Hyperostosis (DISH), also known as Forestier's disease. The large anterior osteophytes, particularly in the cervical spine (though they can be thoracic), can cause compression of the esophagus, leading to dysphagia. Ankylosing spondylitis also involves spinal stiffness and ossification, but typically affects the posterior elements and sacroiliac joints, leading to a 'bamboo spine' appearance and less commonly dysphagia as a primary complaint from osteophytes. Osteoarthritis is more focal and less extensive. Rheumatoid arthritis does not typically cause such osteophytes. Pott's disease (spinal tuberculosis) is an infectious condition with vertebral destruction, not flowing osteophytes.

Question 21

Which of the following interventions is most effective for preventing venous thromboembolism (VTE) in a high-risk orthopedic patient undergoing total knee arthroplasty?





Explanation

For high-risk orthopedic patients undergoing major surgery like total knee arthroplasty, pharmacological prophylaxis with anticoagulants (e.g., LMWH, factor Xa inhibitors, warfarin) is the most effective single intervention for preventing VTE (deep vein thrombosis and pulmonary embolism). While early ambulation, graduated compression stockings, and intermittent pneumatic compression devices are important adjuncts, they are generally considered insufficient alone for high-risk patients. SCDs are a type of IPCD. Current guidelines often recommend a combination of pharmacological and mechanical prophylaxis.

Question 22

A 28-year-old construction worker presents with chronic low back pain and left leg radiculopathy. He has a history of smoking and reports a new onset of urinary hesitancy. MRI shows a large L5-S1 disc herniation with severe canal stenosis. What is the most concerning neurological finding that would prompt immediate surgical intervention?





Explanation

Urinary retention with overflow incontinence, along with saddle anesthesia and bowel dysfunction, are cardinal signs of cauda equina syndrome. This is a surgical emergency requiring immediate decompression to prevent permanent neurological deficits. While foot drop, diminished patellar reflex, S1 numbness, and tibialis anterior weakness are significant neurological deficits, they represent radiculopathy and do not indicate the acute, widespread nerve root compression of cauda equina syndrome. Cauda equina syndrome involves multiple nerve roots (L2 to S5), affecting bladder and bowel function due to sacral nerve involvement.

Question 23

What is the most common primary site for metastatic bone disease that causes osteoblastic (sclerotic) lesions?





Explanation

Prostate cancer is classically known for producing osteoblastic (sclerotic) metastases to bone. While breast cancer can produce mixed lytic and blastic lesions, and lung and kidney cancer typically produce lytic lesions, prostate cancer is the most common cause of purely osteoblastic metastases. Thyroid cancer metastases are usually lytic. Understanding the typical radiographic appearance of metastases from different primary sites is crucial for orthopedic oncologists.

Question 24

Which of the following sacral fracture patterns is most likely to cause cauda equina syndrome?





Explanation

Denis Zone III fractures involve the central sacral canal and are directly associated with cauda equina nerve root injuries, leading to cauda equina syndrome (e.g., bladder/bowel dysfunction, saddle anesthesia). Zone I fractures are lateral to the sacral foramina and typically do not involve the nerve roots directly. Zone II fractures involve the sacral foramina and can affect exiting nerve roots, but Zone III carries the highest risk for cauda equina syndrome due to direct central canal involvement. Transverse sacral fractures below S3 and isolated coccyx fractures are less likely to cause cauda equina syndrome as the nerve roots are generally spared or less critical at these levels.

Question 25

A 75-year-old male with a T12 spinal cord injury (SCI) due to a burst fracture presents with an increasing frequency of urinary tract infections (UTIs) and hydronephrosis on ultrasound. What is the most appropriate long-term bladder management strategy for this patient to prevent renal damage?





Explanation

For patients with spinal cord injury and neurogenic bladder, intermittent catheterization (IC) is the gold standard for long-term bladder management. It minimizes residual urine, reduces the risk of UTIs compared to indwelling catheters, and preserves upper urinary tract function, thus preventing hydronephrosis and renal damage. Indwelling Foley catheters have a high risk of UTIs, stones, and bladder damage. Crede maneuver and spontaneous voiding are often ineffective in achieving complete emptying in neurogenic bladder, leading to high residual volumes. Bladder training is generally not effective in this patient population. Therefore, intermittent catheterization is crucial for renal preservation.

Question 26

Which of the following is an absolute contraindication for non-operative management of a first rib fracture?





Explanation

First rib fractures are often associated with high-energy trauma and can be markers for underlying severe injuries, particularly neurovascular structures. Evidence of subclavian artery or brachial plexus injury is an absolute contraindication for non-operative management, as these injuries require immediate surgical evaluation and often repair to prevent permanent neurological or vascular deficits. While pneumothorax, pulmonary contusion, and significant displacement are serious associated injuries and warrant close monitoring or intervention, they do not universally mandate surgical management of the rib fracture itself in the same way neurovascular injury does. Age over 65 increases morbidity but is not an absolute contraindication to non-operative management of the fracture.

Question 27

A 40-year-old male develops rhabdomyolysis and acute kidney injury following a crush injury to his thigh, requiring emergent fasciotomy for compartment syndrome. Which of the following laboratory findings is most indicative of rhabdomyolysis?





Explanation

While all options listed are potential consequences or associated findings in rhabdomyolysis and acute kidney injury, an elevated creatine kinase (CK) is the most direct and sensitive laboratory marker for muscle damage characteristic of rhabdomyolysis. CK levels can rise to tens or even hundreds of thousands. Myoglobinuria, hyperkalemia, elevated BUN/creatinine (indicating kidney injury), and hypocalcemia (due to calcium sequestration in damaged muscle) are all important findings but are either less specific or occur as a result of the muscle breakdown. An extremely high CK level is the hallmark of rhabdomyolysis.

Question 28

A 10-year-old child presents with a severe kyphoscoliosis (70-degree Cobb angle in both planes) due to congenital vertebral anomalies. What is the primary long-term concern related to their respiratory system if this deformity remains uncorrected?





Explanation

Severe kyphoscoliosis significantly compromises the volume and compliance of the thoracic cage, leading to chronic restrictive lung disease. This reduces lung volumes and can progress to chronic respiratory failure, requiring ventilatory support. Ultimately, the sustained increased pulmonary vascular resistance can lead to pulmonary hypertension and right ventricular hypertrophy (cor pulmonale), which is a serious long-term complication of the restrictive lung disease. So, while pulmonary hypertension is a grave outcome, the primary and preceding respiratory concern is the restrictive lung disease and eventual respiratory failure. Obstructive sleep apnea can occur but is not the primary long-term pulmonary issue from severe kyphoscoliosis itself. Increased susceptibility to pneumonia or aspirations are complications that can arise from the chronic respiratory impairment, but the underlying problem is restrictive lung disease.

Question 29

Which of the following approaches to the thoracic spine (T1-T10) provides the most direct access for anterior column reconstruction and tumor resection, while minimizing the risk to the spinal cord?





Explanation

For anterior column reconstruction and tumor resection in the thoracic spine (T1-T10), the anterolateral (transthoracic) approach, typically via thoracotomy, provides the most direct and extensive exposure to the vertebral body and anterior elements. This allows for en bloc resection of tumors and reconstruction without significant manipulation of the spinal cord, minimizing neurological risk. Posterior and posterolateral approaches primarily address posterior and posterolateral pathology or require significant spinal cord retraction for anterior column access. Transpedicular approaches offer limited anterior access. Minimally invasive posterior approaches are also generally for posterior pathologies or indirect anterior decompression.

Question 30

A 68-year-old male with a history of hypertension and benign prostatic hyperplasia presents to the orthopedic clinic with left groin pain radiating to his knee. Examination reveals pain on passive hip flexion and internal rotation. A potential diagnosis is hip osteoarthritis. Which of the following is an important consideration in this patient's history that may mask or mimic musculoskeletal pain or be an important differential?





Explanation

While all listed options can be relevant, urinary frequency and nocturia related to benign prostatic hyperplasia (BPH) are important to consider because referred pain from the bladder or prostate can sometimes mimic or exacerbate hip/groin pain. While not directly a musculoskeletal cause, it's crucial for an orthopedic examiner to consider non-musculoskeletal sources of pain, especially in the context of urological symptoms in the region. Chronic low back pain and peripheral vascular disease are also important differentials or comorbidities for leg pain, but the question specifically asks about a consideration related to the patient's history of BPH. Previous knee injury and gout are musculoskeletal conditions, not mimicking or masking issues related to BPH.

Question 31

A 25-year-old male presents to the ED after a severe chest trauma. He has multiple left rib fractures (ribs 9-11) and tenderness in the left upper quadrant. Initial X-rays show no pneumothorax or hemothorax. What associated visceral injury should be highly suspected and investigated?





Explanation

Fractures of the lower ribs (9-11) on the left side, particularly with tenderness in the left upper quadrant, should raise a high suspicion for splenic injury. The spleen is located under the left lower ribs and is vulnerable to direct trauma. Cardiac contusion is more associated with sternal or anterior rib fractures. Liver laceration would be suspected with right-sided lower rib fractures. Renal contusion would be a consideration for more posterior lower rib fractures, and diaphragmatic rupture, while possible, is less common than splenic injury with this pattern of trauma. A CT scan of the abdomen and pelvis would be indicated.

Question 32

During an open reduction and internal fixation of a severe acetabular fracture, a large retroperitoneal hematoma is encountered. What is the most common iatrogenic urological injury associated with complex pelvic and acetabular fracture surgery, especially with extensive retroperitoneal dissection?





Explanation

Ureteral injury, particularly during extensive retroperitoneal dissection for complex pelvic and acetabular fracture surgery, is a recognized although uncommon iatrogenic complication. The ureters can be inadvertently clamped, ligated, or lacerated, especially when dealing with large hematomas or distorted anatomy. Bladder rupture and urethral laceration are more common with the initial trauma itself rather than iatrogenic during surgery, although bladder injury is possible with anterior acetabular approaches. Renal artery avulsion is less likely with acetabular surgery, and testicular torsion is unrelated.

Question 33

A 60-year-old male with a history of prostate cancer treated with androgen deprivation therapy presents with a new, rapidly progressing pathological fracture of the distal femur. Biopsy confirms metastatic adenocarcinoma. Which of the following systemic treatments is most appropriate to consider in this scenario?





Explanation

In a patient with metastatic prostate cancer, a pathological fracture, and failure of prior hormonal therapy, a multi-modal approach is typically warranted. Bisphosphonates (like zoledronic acid) and Denosumab are bone-modifying agents used to reduce skeletal-related events (SREs), including fractures. Chemotherapy (e.g., docetaxel, cabazitaxel) is indicated for castration-resistant prostate cancer. Radiation therapy is crucial for local pain control and fracture stabilization. Therefore, all these systemic and local treatments may be considered as part of a comprehensive management plan for this advanced metastatic disease, in conjunction with surgical fixation of the fracture. The question asks for systemic treatments to consider, and both bone-modifying agents and chemotherapy fit this description, along with radiation for local control. So, 'All of the above' is the most comprehensive answer in the context of considering treatment options.

Question 34

Which of the following is a classic presentation of fat embolism syndrome after a long bone fracture, particularly affecting the respiratory system?





Explanation

Fat embolism syndrome (FES) is a serious complication following long bone fractures, particularly femur and tibia. The classic triad of FES includes respiratory distress (dyspnea, hypoxemia, tachypnea), neurological dysfunction (confusion, disorientation), and a petechial rash (over the chest, axillae, conjunctiva). Sudden onset of dyspnea, hypoxemia, and petechial rash is the most classic and specific presentation of FES affecting the respiratory system. The other options are either local fracture symptoms, general inflammatory responses, or other complications of trauma/immobility, not specific to FES.

Question 35

A 2-year-old child with spina bifida (myelomeningocele at L3-L4 level) is being evaluated. What is the most likely orthopedic problem this child will develop that requires intervention related to their neurological deficit?





Explanation

Children with myelomeningocele at the L3-L4 level have significant neurological deficits affecting motor and sensory function below that level. This leads to a multitude of orthopedic problems due to muscle imbalance, paralysis, and lack of sensation. These commonly include scoliosis (due to truncal muscle imbalance), clubfoot (often rigid and severe), and hip dislocation (due to unopposed hip flexor and adductor activity). Progressive ankle valgus can also develop. Therefore, 'All of the above' is the most appropriate answer as these children often present with multiple complex deformities requiring comprehensive orthopedic management, including consideration of bladder and bowel neurogenic dysfunction.

Question 36

Which of the following conditions affecting the spine is characterized by severe inflammation of the entheses and can lead to sacroiliitis and eventual 'bamboo spine' on radiographs, and is often associated with inflammatory bowel disease?





Explanation

Ankylosing spondylitis (AS) is a chronic inflammatory disease primarily affecting the axial skeleton. It is characterized by inflammation of the entheses (sites where tendons/ligaments attach to bone), leading to sacroiliitis and progressive spinal fusion, culminating in the classic 'bamboo spine' appearance. AS is one of the seronegative spondyloarthropathies and has a strong association with inflammatory bowel disease (Crohn's disease and ulcerative colitis), uveitis, and psoriasis. While psoriatic arthritis and reactive arthritis are also spondyloarthropathies and can cause sacroiliitis, AS is the most archetypal condition for the described presentation. Rheumatoid arthritis primarily affects peripheral joints, and DISH is a non-inflammatory ossification condition.

Question 37

A 58-year-old male with a history of intravenous drug use presents with acute onset severe low back pain, fever, chills, and progressive weakness in both lower extremities. An MRI shows an L3-L4 disc space infection (spondylodiscitis) and a large epidural abscess. What is the most critical initial diagnostic step in managing this patient?





Explanation

While urgent surgical decompression may be necessary if there are progressive neurological deficits, and antibiotics are crucial, the most critical initial diagnostic step is to identify the causative organism. Blood cultures and measurement of inflammatory markers like CRP are essential to guide specific antibiotic therapy and monitor response. Lumbar puncture is generally avoided in the presence of an epidural abscess due to the risk of spreading the infection. EMG would provide information on nerve function but is not an acute diagnostic step for infection. Therefore, identifying the pathogen to tailor treatment is paramount once the diagnosis is suspected.

Question 38

Which of the following is a potential late complication of chronic pelvic trauma or pelvic surgery that can lead to persistent perineal or pelvic pain?





Explanation

Pudendal neuralgia is characterized by chronic neuropathic pain in the perineum, external genitalia, or anorectal region, often exacerbated by sitting. It can result from direct trauma, nerve compression (e.g., from scar tissue or hematoma after pelvic trauma or surgery), or entrapment in Alcock's canal. While the other listed conditions are types of nerve entrapment or pain syndromes, pudendal neuralgia specifically correlates with perineal/pelvic pain and is a known, albeit uncommon, late complication of pelvic trauma or surgery. Meralgia paresthetica involves the lateral femoral cutaneous nerve (thigh), piriformis syndrome involves the sciatic nerve (buttock/leg), obturator nerve entrapment causes groin/medial thigh pain, and sciatica is general sciatic nerve pain.

Question 39

A 4-year-old child presents with a limp, fever, and refusal to bear weight. X-rays are normal. MRI shows fluid in the hip joint and a small lesion in the adjacent ilium. Labs show elevated CRP and ESR. Urine culture is positive for E. coli. What is the most likely diagnosis?





Explanation

Given the child's fever, limp, refusal to bear weight, elevated inflammatory markers, and a positive urine culture, the presence of a lesion in the ilium along with joint fluid points strongly to osteomyelitis of the ilium with a sympathetic (reactive) effusion in the hip joint. Hematogenous spread from the urinary tract (E. coli UTI) is a common source for osteomyelitis in children. While septic arthritis of the hip is also a possibility, the specific mention of a lesion in the ilium makes osteomyelitis a more fitting primary diagnosis, with the joint effusion being reactive. Transient synovitis typically has normal labs. Legg-Calvé-Perthes disease is avascular necrosis, and JIA is a chronic inflammatory arthritis, neither of which presents acutely with fever and positive cultures like this.

Question 40

Which of the following statements regarding the management of pressure ulcers in a patient with a T10 complete spinal cord injury is most accurate from an orthopedic perspective?





Explanation

For patients with SCI, chronic deep pressure ulcers (Stage III and IV) frequently involve the underlying bone, leading to osteomyelitis. This is a very common and serious complication that can result in systemic sepsis and requires aggressive management, often including surgical debridement of infected bone and long-term antibiotics. While repositioning and specialized mattresses are crucial for prevention and early stage ulcers, and surgical debridement/closure is often needed for deep ulcers, the orthopedic relevance lies particularly in the high risk of underlying osteomyelitis. Topical antibiotics alone are insufficient for deep ulcers with potential osteomyelitis. Not all ulcers require skin grafts; flaps are often used for deeper wounds.

Question 41

What is the most accurate statement regarding the assessment of respiratory function in a patient with severe adolescent idiopathic scoliosis (AIS) undergoing surgical correction?





Explanation

In severe AIS, preoperative pulmonary function tests are crucial. Patients with a forced vital capacity (FVC) less than 40% of predicted are considered to be at highest risk for significant postoperative respiratory morbidity and potential respiratory failure. While FVC is an important parameter, it's not the most sensitive predictor as others like forced expiratory volume in 1 second (FEV1) and FEV1/FVC ratio are also important. Surgical correction can improve lung function, but not always immediately or significantly, and it carries its own risks. PFTs are definitely needed for assessment, and ABG provides snapshot information, not a comprehensive assessment of reserve.

Question 42

A 30-year-old male sustains a traumatic complete T4 spinal cord injury. Which of the following is the most significant long-term cardiovascular risk related to his level of injury?





Explanation

For spinal cord injuries at or above T6, autonomic dysreflexia is a significant and life-threatening long-term cardiovascular risk. It is a sudden, uncontrolled sympathetic response to noxious stimuli below the level of injury, leading to severe hypertension, bradycardia, headache, and sweating above the injury. While DVT/PE risk is high initially and can persist, and other cardiovascular issues can occur, autonomic dysreflexia is a unique and acute life-threatening phenomenon specific to high-level SCI. Hypertension secondary to renal dysfunction is possible but not the most significant or direct cardiovascular risk stemming from the SCI level itself. Peripheral vascular disease and coronary artery disease are general risks, not specific to this level of SCI.

Question 43

Which surgical approach for a lumbar discectomy carries the highest risk of iatrogenic injury to the ureter?





Explanation

The direct anterior lumbar interbody fusion (ALIF) approach requires significant retroperitoneal dissection and mobilization of the great vessels. The ureters lie within the retroperitoneum and are at risk of injury (laceration, clamping, kinking) during this extensive exposure. While OLIF also involves a retroperitoneal approach, it is generally considered less invasive than a direct ALIF and potentially carries a lower risk for ureteral injury if carefully performed. Posterior, transforaminal, and posterolateral approaches are far removed from the ureters and thus carry negligible risk of ureteral injury.

Question 44

A 65-year-old male with a T12 burst fracture and complete paraplegia (ASIA A) is undergoing rehabilitation. He reports difficulty with bowel movements and requires manual disimpaction. What is the most appropriate long-term bowel management strategy for this patient?





Explanation

Patients with a complete spinal cord injury at T12, which is typically above the sacral cord, will have an upper motor neuron (spastic) bowel. The most appropriate long-term management is a regular, scheduled bowel program utilizing suppositories and/or digital stimulation. This helps retrain the bowel to empty reflexively and prevents constipation and impaction. While diet and fluids are important adjuncts, they are insufficient alone. Daily stimulant laxatives are not ideal for long-term use. Surgical colostomy is reserved for intractable problems. Expectant management is inappropriate for a complete SCI. This approach aims to achieve predictable and controlled bowel movements, thereby improving quality of life and preventing complications.

Question 45

Which condition is characterized by ossification of the anterior longitudinal ligament of the spine, primarily affecting the thoracic spine, and may be associated with diabetes mellitus?





Explanation

Diffuse Idiopathic Skeletal Hyperostosis (DISH), also known as Forestier's disease, is a non-inflammatory spondyloarthropathy characterized by extensive ossification of the anterior longitudinal ligament, primarily affecting the thoracic spine. It typically spares the sacroiliac and facet joints and is often associated with metabolic disorders like diabetes mellitus and obesity. Ankylosing spondylitis causes a 'bamboo spine' but is an inflammatory condition affecting entheses and posterior elements. Osteoarthritis is degenerative but not diffuse ossification of the ALL. Pott's disease is infectious. Rheumatoid arthritis primarily affects peripheral joints and the cervical spine, but not with ALL ossification.

Question 46

A 50-year-old male presents with chronic cough, weight loss, and severe right shoulder pain. Radiographs of the shoulder are unremarkable, but a chest X-ray shows an apical mass. What is the most likely diagnosis causing his shoulder pain?





Explanation

This is a classic presentation of a Pancoast tumor, which is an apical lung tumor. It can invade the brachial plexus, leading to severe shoulder and arm pain (often mimicking musculoskeletal shoulder pathology or cervical radiculopathy), and can also cause Horner's syndrome if the sympathetic chain is involved. The chronic cough and weight loss are systemic symptoms of lung cancer. The key here is the apical mass seen on chest X-ray in conjunction with shoulder pain. The other conditions are primarily musculoskeletal or neurological and would not explain the lung mass or systemic symptoms.

Question 47

Which of the following interventions is most critical in preventing long-term orthopedic complications in a child born with myelomeningocele?





Explanation

While all listed interventions are important in the comprehensive care of a child with myelomeningocele, prompt surgical closure of the spinal defect at birth is critical. This procedure aims to protect the exposed spinal cord/nerves from trauma and infection, which can worsen neurological function. While it cannot reverse existing deficits, it helps prevent further neurological deterioration, which in turn influences the severity of orthopedic complications like hip dislocations, foot deformities, and scoliosis. Without surgical closure, the risk of infection and further neurological damage to the exposed cord is extremely high. The other options are subsequent management strategies that rely on the initial spinal defect closure.

Question 48

A patient with a traumatic T4 spinal cord injury develops new-onset fever, increased spasticity, and a worsening sacral pressure ulcer. What is the most concerning urological complication that could be contributing to these systemic symptoms?





Explanation

In a patient with SCI, a neurogenic bladder predisposes to recurrent urinary tract infections (UTIs) due to incomplete emptying, catheterization, and stasis. UTIs can manifest with systemic symptoms like fever, increased spasticity (a common sign of infection in SCI patients), and can complicate wound healing (like pressure ulcers) or even lead to sepsis. While bladder stones and renal insufficiency are possible long-term complications of neurogenic bladder, recurrent UTIs are the most direct and common cause of acute systemic symptoms in this scenario. Stress incontinence is a symptom, not a systemic complication. Autonomic dysreflexia is a sympathetic hyperreflexia, typically triggered by noxious stimuli, and while it can cause fever, the overall clinical picture with worsening pressure ulcer makes UTI a primary suspect.

Question 49

A 70-year-old male with severe osteoporotic vertebral compression fractures in the thoracic spine develops persistent, severe back pain despite conservative measures. What is a key consideration when deciding on surgical intervention (e.g., kyphoplasty/vertebroplasty) in an elderly patient with significant comorbidities?





Explanation

While age, kyphosis correction, and pulmonary function are all considerations, a critical and unique risk specific to kyphoplasty/vertebroplasty in the thoracic spine is the potential for cement extravasation into the thoracic cavity (pleural space, lung parenchyma, or mediastinum). This can lead to serious complications such as pneumothorax, pulmonary embolism (cement embolization), or injury to vital structures. Neurological deficit is an indication for surgery, but the question asks for a key consideration when deciding on surgical intervention specifically in this context, highlighting a unique risk of the procedure itself. The risk of cement extravasation into the thoracic cavity mandates careful technique and imaging guidance.

Question 50

A 45-year-old male presents with right shoulder and arm pain, tingling in the fourth and fifth fingers, and a positive Adson's test. He also complains of intermittent arm swelling and discoloration. Which type of thoracic outlet syndrome is most likely?





Explanation

The patient's symptoms of pain, tingling in the ulnar nerve distribution (suggesting brachial plexus involvement), a positive Adson's test (indicating compression), combined with intermittent arm swelling and discoloration, are highly indicative of venous thoracic outlet syndrome. This involves compression of the subclavian vein, which can lead to thrombosis (Paget-Schroetter syndrome), edema, and cyanosis. Neurogenic TOS would primarily present with neurological symptoms. Arterial TOS would involve symptoms of ischemia (pallor, coolness, claudication). While there's a neurological component, the vascular signs of swelling and discoloration point specifically to venous compression. Pancoast tumor can mimic TOS but typically causes Horner's syndrome and doesn't usually cause vascular swelling/discoloration.

Question 51

Which of the following is the most effective approach for assessing the respiratory status and identifying complications in a patient with a T2 complete spinal cord injury in the acute setting?





Explanation

A T2 complete SCI affects all intercostal muscles, leaving only the diaphragm (phrenic nerve C3-C5) and accessory neck muscles for respiration. This significantly compromises ventilatory capacity and cough effectiveness. In the acute setting, serial arterial blood gas (ABG) analysis provides crucial information on oxygenation and ventilation (pH, PaCO2, PaO2). Combined with rigorous clinical observation for signs of respiratory distress (e.g., increased work of breathing, accessory muscle use), it offers the most effective and real-time assessment of respiratory status and helps identify complications like hypoventilation or respiratory failure. Spirometry/PFTs are typically for stable patients. Daily chest X-rays are not always necessary. Auscultation/percussion and pulse oximetry are important but less comprehensive than ABG for a critical T2 SCI. Capnography is useful but primarily for CO2 monitoring, and ABG offers a broader picture.

Question 52

What is the most common cause of a spontaneous psoas abscess that may mimic or cause spinal symptoms?





Explanation

A primary psoas abscess, while less common than secondary, can arise from hematogenous spread without an obvious local source. However, secondary psoas abscesses, which are far more common, usually originate from infections of adjacent structures. Among the choices provided, urinary tract infections (UTIs) are a relatively common source of infection that can spread to the psoas muscle, particularly in immunocompromised individuals or those with anatomical abnormalities. Tuberculosis of the spine (Pott's disease) is a classic cause of psoas abscess but is less common in developed countries compared to other sources. Crohn's disease, diverticulitis, and appendicitis are also causes of secondary psoas abscess by direct extension, but UTIs can be a more insidious and widespread source via hematogenous or lymphatic routes. In many contexts, urogenital and gastrointestinal sources are both major contributors to secondary psoas abscesses.

Question 53

A 60-year-old male undergoes a total hip arthroplasty. Four weeks post-operatively, he develops fever, hip pain, and warmth. ESR and CRP are elevated. He also reports urinary frequency and dysuria, and a urine culture is positive for Staphylococcus aureus. What is the most likely pathway for the periprosthetic joint infection?





Explanation

Hematogenous spread from a distant source of infection, such as a urinary tract infection (UTI), is a well-recognized cause of late periprosthetic joint infection (PJI). In this scenario, the presence of a positive urine culture for Staphylococcus aureus (a common cause of both UTIs and PJI) along with systemic signs of infection and a painful, warm hip, strongly suggests that the UTI is the source of the PJI. While intraoperative contamination, direct inoculation, and superficial wound infections are all possible causes, the timing (4 weeks post-op) and the documented UTI point strongly to hematogenous spread. Lymphatic spread is a less common pathway for PJI.

Question 54

Which of the following interventions is most crucial for preventing acute kidney injury (AKI) in a patient undergoing massive transfusion for a complex pelvic fracture?





Explanation

In the setting of massive transfusion for complex pelvic fractures, patients are at high risk for acute kidney injury due to hypoperfusion, shock, and complications from transfusion (e.g., pigment nephropathy from hemolysis). Maintaining euvolemia and systemic blood pressure (mean arterial pressure > 65 mmHg) is paramount to ensure adequate renal perfusion and oxygenation, thereby preventing AKI. Loop diuretics can worsen hypovolemia. Aggressive vasopressors without adequate volume resuscitation can exacerbate renal ischemia. Restricting crystalloids too much can lead to under-resuscitation. Prophylactic hemodialysis is not indicated.

Question 55

A 30-year-old female presents with severe pain in her right upper extremity after a fall. She has sustained a comminuted fracture of the right humeral shaft. She is also complaining of shortness of breath and pleuritic chest pain. On examination, there is crepitus over the right lateral chest wall. What is the most likely associated thoracic injury?





Explanation

The patient's symptoms of shortness of breath and pleuritic chest pain, along with crepitus over the lateral chest wall, are highly suggestive of a pneumothorax, likely caused by an associated rib fracture that might have punctured the pleura. While a humeral shaft fracture typically does not directly cause thoracic injury, a severe fall could lead to both injuries independently. Pulmonary contusion can cause shortness of breath, but crepitus points more to air in the subcutaneous tissues from a pneumothorax. Cardiac contusion and aortic dissection are less likely given the presentation. Diaphragmatic rupture is also possible but less directly indicated by crepitus.

Question 56

Which of the following is an expected neurogenic bladder pattern in a patient with a complete T10 spinal cord injury (UMN bladder)?





Explanation

A complete T10 spinal cord injury is above the sacral micturition center (S2-S4). This results in an upper motor neuron (UMN) or spastic/reflexic bladder. Key characteristics of a UMN bladder include hyperreflexia of the detrusor muscle, leading to involuntary contractions and poor coordination with the external urethral sphincter (detrusor-sphincter dyssynergia, DSD). This results in high intravesical pressures and incomplete emptying, increasing the risk of UTIs and renal damage. A flaccid, areflexic bladder is characteristic of lower motor neuron lesions (e.g., cauda equina injury or sacral level SCI). Normal function is not expected, and bladder dysfunction is neurological, not psychological.

Question 57

A 55-year-old male with a history of chronic obstructive pulmonary disease (COPD) and long-term corticosteroid use is undergoing an elective total hip arthroplasty. What is the most critical perioperative pulmonary management strategy to reduce postoperative complications?





Explanation

For patients with significant pulmonary comorbidities like COPD, preoperative optimization of lung function (e.g., smoking cessation, bronchodilators, steroids if indicated, treatment of infections) is crucial. Combined with early postoperative mobilization, deep breathing exercises, and incentive spirometry, these strategies significantly reduce the risk of postoperative pulmonary complications such as atelectasis, pneumonia, and respiratory failure. While bronchodilators may be part of the regimen, aggressive use without optimization is not the primary strategy. Prophylactic antibiotics are for infection, not primary pulmonary management. Fluid restriction is generally not recommended as it can lead to dehydration. Prolonged mechanical ventilation is a last resort, not a preventative strategy.

Question 58

Which of the following spinal tumors is most commonly associated with a 'soap bubble' appearance on X-ray and is often found in the sacrum?





Explanation

Chordomas are rare, slow-growing malignant bone tumors arising from remnants of the notochord. They are most commonly found at the ends of the axial skeleton, specifically the sacrococcygeal region (50-60%) and the clivus (30-35%), and less frequently in the mobile spine. Radiographically, they often present as a lytic, destructive lesion with a characteristic 'soap bubble' or 'bubbly' appearance due to calcification and mucoid degeneration within the tumor. Osteosarcoma and Ewing's sarcoma are more aggressive and usually found in long bones or other parts of the spine. Chondrosarcoma is cartilaginous, and multiple myeloma presents as punched-out lytic lesions.

Question 59

A 20-year-old male presents after a high-energy fall, resulting in a T11 burst fracture with an incomplete spinal cord injury (ASIA D). He is able to void spontaneously but reports a sensation of incomplete bladder emptying. Which of the following studies is most appropriate for further evaluation of his bladder function?





Explanation

Given the patient's incomplete SCI and symptoms of incomplete bladder emptying, urodynamic studies are the most appropriate investigation. Urodynamics provide a comprehensive assessment of bladder storage (compliance, sensation, capacity) and emptying (detrusor contractility, detrusor-sphincter synergy/dyssynergia, post-void residual volume). This information is crucial for guiding specific treatment to prevent long-term complications like UTIs and renal damage. IVP and renal ultrasound assess upper tract anatomy but not bladder function. Cystoscopy allows direct visualization of the bladder but not its function. RUG evaluates the urethra, not primary bladder function. The patient's ability to void spontaneously indicates a need to understand the mechanics of his voiding, not just anatomy.

Question 60

A 60-year-old male with a history of lung cancer undergoing chemotherapy develops severe mid-back pain that is worse at night and unrelieved by rest. MRI shows a destructive lesion at T7 with epidural compression. What is the most appropriate initial management step for the pain?





Explanation

In a patient with known lung cancer, a new destructive vertebral lesion with epidural compression and pain worsening at night (red flag for malignancy) strongly suggests metastatic spinal cord compression (MSCC). The most appropriate initial management for suspected MSCC, particularly with pain, is to administer high-dose corticosteroids (e.g., dexamethasone) immediately to reduce peritumoral edema and alleviate pain and neurological compromise, while simultaneously evaluating for definitive treatment options like radiation therapy or urgent surgical decompression. NSAIDs and muscle relaxants are insufficient. Opioids are for pain control but don't address the underlying compression. Physical therapy is contraindicated until stability is assessed and compression relieved. Immediate surgery may be indicated if there's rapid neurological deterioration, but steroids are typically the first-line medical intervention while further workup and planning occur.

Question 61

Which of the following is the most likely long-term complication of a severely rigid and uncorrected adult kyphoscoliosis?





Explanation

A severely rigid and uncorrected adult kyphoscoliosis, especially with significant thoracic curvature, can lead to severe restriction of lung volumes. Over time, this chronic restrictive lung disease causes increased pulmonary vascular resistance, eventually leading to pulmonary hypertension and right-sided heart failure (cor pulmonale). This is a major cause of morbidity and mortality in patients with severe, untreated spinal deformities. The other options are orthopedic complications that can occur with spinal deformities but are not the most significant long-term, life-threatening complication associated with severe, uncorrected kyphoscoliosis specifically impacting overall health.

Question 62

A 40-year-old male presents with chronic cough, hemoptysis, and chest pain. Imaging reveals a mass in the apex of the right lung. Orthopedically, what is a specific neurological sign you would look for that is highly suggestive of local tumor extension?





Explanation

A mass in the apex of the lung is characteristic of a Pancoast tumor. Pancoast tumors are known to invade the brachial plexus (causing arm pain and neurological deficits in the C8-T1 distribution) and the sympathetic chain. Involvement of the sympathetic chain specifically causes Horner's syndrome, which is characterized by ipsilateral ptosis (drooping eyelid), miosis (constricted pupil), and anhidrosis (absence of sweating) of the face. This neurological triad is highly suggestive of local tumor extension from an apical lung mass. The other neurological signs are related to different nerve roots or peripheral nerves and are not specific to Pancoast tumor in this context.

Question 63

What is the primary goal of surgical management for an unstable thoracolumbar burst fracture in a neurologically intact patient?





Explanation

For an unstable thoracolumbar burst fracture in a neurologically intact patient, the primary goal of surgical management is to prevent future neurological deterioration by stabilizing the spinal column and decompressing the spinal canal, while also restoring sagittal alignment (preventing progressive kyphosis). While complete pain relief and immediate return to activity are desirable, they are secondary goals. Minimizing surgical time is important but not the primary goal. Fusion of as many levels as possible is generally avoided to preserve spinal mobility if stability can be achieved with shorter constructs.

Question 64

A 35-year-old male presents with persistent pain and numbness in the C8-T1 distribution after a clavicle fracture that healed with significant malunion. What is the most likely cause of his new neurological symptoms?





Explanation

A malunited clavicle, particularly with significant displacement or exuberant callus formation, can compress the brachial plexus (especially the lower trunk, C8-T1) as it passes through the thoracic outlet. This compression leads to pain, numbness, and weakness in the C8-T1 distribution. While a nonunion can also cause symptoms, direct compression from a malunion/callus is a specific orthopedic complication. Long thoracic nerve injury primarily affects serratus anterior function (scapular winging). Cervical radiculopathy is a differential but less likely to be directly caused by a healed clavicle fracture. A Pancoast tumor would be a rare and unrelated occurrence in this context.

Question 65

A 70-year-old female with osteoporosis and chronic steroid use for rheumatoid arthritis presents with sudden severe back pain after a minor fall. X-rays show a new compression fracture at T12. Which of the following is an important associated risk to consider, particularly given her steroid use?





Explanation

Chronic steroid use (common in rheumatoid arthritis patients) for prolonged periods leads to severe osteoporosis, increasing fracture risk. Steroids also impair bone healing, increase the risk of gastrointestinal bleeding (especially if NSAIDs are also used), and can worsen glucose control in diabetic patients or induce steroid-induced diabetes. Therefore, all these risks are important associated considerations when managing an elderly patient with osteoporosis and chronic steroid use who sustains a compression fracture. The question asks for an associated risk, not just the primary risk, making 'All of the above' the most comprehensive answer.

Question 66

Which of the following describes the typical pattern of pain referral from the kidney to the musculoskeletal system that an orthopedic surgeon should be aware of?





Explanation

Pain originating from the kidney (e.g., renal colic from a stone, pyelonephritis) typically presents as flank pain. This pain can radiate anteriorly to the groin, anterior abdominal wall, or even down to the scrotum/labia, often mimicking musculoskeletal pain in the hip or groin region. An orthopedic surgeon should be aware of this referred pain pattern to differentiate it from true musculoskeletal pathology. Shoulder pain and posterior calf pain are not typical referral patterns for kidney issues. Anterior thigh pain can be from nerve compression, but flank-to-groin is classic for kidney. Diffuse bilateral knee pain is nonspecific.

Question 67

A patient with a T8 spinal cord injury has developed a chronic non-healing sacral pressure ulcer. What specific orthopedic complication might be present underneath the ulcer that requires surgical debridement and long-term antibiotic therapy?





Explanation

Chronic, non-healing deep pressure ulcers, especially over bony prominences like the sacrum in a patient with spinal cord injury, frequently lead to osteomyelitis of the underlying bone (sacrum or ischium). This infection is a serious complication that mandates surgical debridement of necrotic and infected bone along with long-term systemic antibiotic therapy for eradication. Heterotopic ossification is bone formation in soft tissues, DVT is a vascular complication, septic arthritis is infection of a joint, and Charcot arthropathy is neurogenic joint destruction; while these can occur in SCI, osteomyelitis directly beneath a chronic pressure ulcer is the most common and relevant orthopedic complication in this specific scenario.

Question 68

In evaluating a stable patient with multiple rib fractures and a sternal fracture following blunt chest trauma, what is the most important radiographic finding to monitor for in the initial 24-48 hours to assess for pulmonary contusion progression?





Explanation

Pulmonary contusion is a common consequence of blunt chest trauma and involves bruising of lung tissue. It often progresses in the first 24-48 hours, leading to increasing inflammation, edema, and hemorrhage within the lung parenchyma. This progression is typically seen on chest X-ray as increasing opacification and consolidation, which correlates with worsening respiratory function (hypoxia, decreased lung compliance). Widening of the mediastinum suggests aortic injury. Hemothorax is blood in the pleural space. Fracture displacement is related to the bony injury. Resolution of subcutaneous emphysema is a good sign, but increasing opacification directly monitors the contusion.

Question 69

A 40-year-old male with a history of recurrent urinary tract infections presents with severe, acute low back pain, fever, and new-onset weakness in his right leg. MRI shows an L4-L5 epidural abscess with significant cord compression. What is the most appropriate initial management?





Explanation

The patient's presentation with severe back pain, fever, new-onset focal neurological deficit (right leg weakness), and MRI evidence of an epidural abscess with significant cord compression constitutes a surgical emergency. Urgent surgical decompression is required to relieve pressure on the spinal cord and prevent irreversible neurological damage. This must be combined with intravenous antibiotics to treat the infection. Oral antibiotics are insufficient. Epidural steroid injections are contraindicated in infection. Percutaneous drainage may be considered for small, non-compressive abscesses without neurological deficits, but not in this scenario. Brace immobilization and observation are inappropriate for acute neurological compromise.

Question 70

A 65-year-old male undergoes a major spinal fusion for severe kyphoscoliosis. Postoperatively, he develops acute respiratory distress, hypoxemia, and bilateral pulmonary infiltrates, but no fever. Cardiac evaluation is unremarkable. Which of the following is the most likely pulmonary complication?





Explanation

Acute respiratory distress syndrome (ARDS) is a severe form of acute lung injury characterized by acute onset of hypoxemia, bilateral pulmonary infiltrates on chest imaging, and absence of cardiogenic pulmonary edema. Major orthopedic surgeries, especially spinal fusions in patients with pre-existing lung conditions, can trigger a systemic inflammatory response leading to ARDS. While aspiration pneumonia and atelectasis are possible, the severity (acute respiratory distress, bilateral infiltrates) without fever makes ARDS a more likely diagnosis. Pulmonary embolism typically presents with sudden dyspnea and hypoxemia but often without bilateral infiltrates initially. Congestive heart failure would usually show signs of cardiogenic edema.

Question 71

Which of the following metabolic bone disorders, often seen in patients with end-stage renal disease, is characterized by brown tumors and subperiosteal bone resorption, especially in the phalanges?





Explanation

Renal osteodystrophy encompasses several bone abnormalities in chronic kidney disease. Specifically, secondary hyperparathyroidism is characterized by excessive parathyroid hormone secretion in response to hypocalcemia and hyperphosphatemia. This leads to high bone turnover, osteoclastic resorption, subperiosteal bone resorption (classic in phalanges, distal clavicle), and the formation of brown tumors (osteitis fibrosa cystica). Osteomalacia involves impaired mineralization. Adynamic bone disease is low bone turnover. Osteoporosis is generalized bone loss, and Paget's is a localized disorder of bone remodeling.

Previous ChapterMaster Urinary Tract Stones: 2019 Exam Questions Next Chapter Master the Graduating Exam ABE: Achieve Your Best Score
Dr. Mohammed Hutaif
Medically Verified Content by
Prof. Dr. Mohammed Hutaif
Consultant Orthopedic & Spine Surgeon
Chapter Index
    Back to Master Guide