This practice set contains high-yield board review questions covering key concepts in 6. Spine. Each clinical scenario is designed to test your diagnostic and management skills relevant to this subspecialty.
Question 6741
Topic: Thoracolumbar Spine & Deformity
Which of the following describes the anatomical anomaly defining Wiltse-Newman Type V spondylolisthesis?
Correct Answer & Explanation
. Bone weakened by disease, such as tumor or osteoporosis
Explanation
Wiltse-Newman Type V, or Pathologic Spondylolisthesis, results from bone weakening due to generalized or localized bone disease, such as tumors (primary or metastatic), Paget's disease, or severe osteoporosis, which compromises the structural integrity of the vertebral segment and leads to slippage. Other options describe different types of spondylolisthesis.
Question 6742
Topic: Cervical Spine
In the throwing athlete, the medial ulnar collateral ligament (UCL) of the elbow is subjected to significant stress. Which specific bundle of the UCL provides the primary restraint to valgus stress at 90 degrees of elbow flexion?
Correct Answer & Explanation
. Anterior bundle
Explanation
The anterior bundle of the medial ulnar collateral ligament (UCL) is the primary restraint to valgus instability of the elbow from 30 to 120 degrees of flexion. The posterior bundle is a secondary restraint, taut in flexion >90 degrees, and the transverse ligament (Cooper's) has no significant role in elbow stability.
Question 6743
Topic: Cervical Spine
In the medial ulnar collateral ligament (MUCL) complex of the elbow, which structural component provides the primary restraint to valgus stress between 30 and 90 degrees of flexion?
Correct Answer & Explanation
. Anterior band of the anterior bundle of the MUCL
Explanation
The anterior bundle of the MUCL is the primary stabilizer against valgus stress at the elbow. Specifically, the anterior band of the anterior bundle is taut in early flexion (up to 90 degrees) and is the primary restraint in this arc, while the posterior band of the anterior bundle becomes tighter in greater flexion (>90 degrees).
Question 6744
Topic: 6. Spine
A 29-year-old overhead athlete complains of vague posterior shoulder pain and early fatigue when pitching. Physical exam demonstrates weakness in external rotation with the arm abducted to 90 degrees. MRI shows isolated fatty infiltration and severe atrophy of the teres minor muscle. What is the most likely diagnosis?
Correct Answer & Explanation
. Quadrilateral space syndrome
Explanation
Quadrilateral space syndrome results from compression of the posterior branch of the axillary nerve and the posterior humeral circumflex artery within the quadrilateral space (often by fibrous bands). This classically presents as isolated atrophy and fatty infiltration of the teres minor on MRI, accompanied by poorly localized posterior shoulder pain.
Question 6745
Topic: 6. Spine
Which imaging modality is most valuable for assessing the presence of spinal cord pathology in a child with a new-onset, progressive cavus foot deformity?
Correct Answer & Explanation
. Magnetic Resonance Imaging (MRI) of the spine.
Explanation
For new-onset or progressive cavus foot, especially unilateral or asymmetric, in a child, a spinal cord lesion (e.g., tethered cord, tumor, syrinx) must be ruled out. MRI of the spine is the gold standard for visualizing neural axis abnormalities, soft tissue lesions, and bony malformations of the spine. Plain radiographs and CT scans are better for bony architecture of the foot. EMG/NCS are useful for diagnosing peripheral neuropathies like CMT but won't visualize spinal cord pathology directly.
Question 6746
Topic: 6. Spine
Which of the following describes a key difference in presentation between Friedreich's ataxia and Charcot-Marie-Tooth disease as causes of cavus foot?
Correct Answer & Explanation
. Friedreich's ataxia is characterized by cerebellar ataxia, dysarthria, and often cardiomyopathy, in addition to peripheral neuropathy and cavus feet.
Explanation
Friedreich's ataxia is a progressive, inherited neurodegenerative disorder that primarily affects the spinal cord, cerebellum, and peripheral nerves. While it causes a peripheral neuropathy leading to cavus feet, its defining features include progressive ataxia (cerebellar dysfunction), dysarthria, scoliosis, loss of position and vibratory sense, and frequently, cardiomyopathy. CMT, while also a peripheral neuropathy causing cavus feet, typically lacks the cerebellar signs, severe scoliosis, and cardiomyopathy seen in Friedreich's ataxia. Both generally present in childhood/adolescence and are bilateral.
Question 6747
Topic: 6. Spine
A 60-year-old patient with rheumatoid arthritis develops cervical myelopathy. From a biomechanical perspective, what is the MOST concerning feature of the atlantoaxial joint in this condition?
Correct Answer & Explanation
. Inflammatory destruction of the transverse atlantal ligament.
Explanation
In rheumatoid arthritis, chronic inflammation can lead to the destruction and laxity of ligaments, particularly the transverse atlantal ligament (TAL). The TAL is crucial for stabilizing the atlantoaxial joint by holding the odontoid process (dens) against the anterior arch of C1. Its destruction allows anterior translation of C1 on C2, leading to atlantoaxial subluxation, which can compress the spinal cord (myelopathy) or brainstem. While odontoid erosion occurs, TAL destruction is the direct cause of instability.
Question 6748
Topic: 6. Spine
In spinal biomechanics, what is the significance of the 'neutral zone'?
Correct Answer & Explanation
. The small range of motion around the neutral posture where minimal resistance is offered to movement.
Explanation
The neutral zone is a concept describing the small, central range of intervertebral motion where there is minimal resistance from passive spinal structures (ligaments, capsules). It represents the region of greatest laxity or 'play' in the spinal segment. An increase in the neutral zone is an indicator of spinal instability, as the segment becomes less constrained by passive structures and relies more on active muscle control. It is where minimal passive resistance is offered, not maximal.
Question 6749
Topic: 6. Spine
A 60-year-old diabetic male presents with insidious onset of severe back pain, fever, and weight loss. MRI shows discitis and osteomyelitis at L3/4 with epidural abscess formation. What is the most appropriate initial management approach?
Correct Answer & Explanation
. CT-guided biopsy and culture followed by targeted IV antibiotics
Explanation
For suspected vertebral osteomyelitis and discitis with an epidural abscess, particularly in an immunocompromised patient like a diabetic, the initial management requires definitive diagnosis and identification of the causative organism. A CT-guided biopsy and culture are crucial to obtain tissue for microbiological analysis. Once the organism and its sensitivities are known, targeted intravenous antibiotics should be initiated. Urgent surgical decompression and debridement are indicated if there is neurological deficit, progressive deformity, or failure of medical management. Oral antibiotics alone are insufficient.
Question 6750
Topic: 6. Spine
A 65-year-old male presents with worsening back pain and new onset neurological deficit (foot drop). MRI reveals a metastatic lesion compressing the spinal cord at T10, originating from lung cancer. What is the most appropriate immediate management for symptomatic spinal cord compression due to metastasis?
Correct Answer & Explanation
. High-dose corticosteroids followed by urgent surgical decompression
Explanation
For symptomatic metastatic spinal cord compression (MSCC) with new onset or progressing neurological deficit (like foot drop), the immediate management involves two critical steps: first, high-dose corticosteroids (e.g., dexamethasone) to reduce peritumoral edema, and second, urgent surgical decompression to relieve pressure on the spinal cord. Rapid decompression is crucial to maximize the chances of neurological recovery. While external beam radiation therapy (EBRT) is an important part of treatment for MSCC, especially as an adjunct to surgery or for patients without neurological deficits, surgical decompression is prioritized for patients with neurological compromise.
Question 6751
Topic: 6. Spine
A 40-year-old female presents with chronic low back pain that radiates down her left leg to the foot, associated with numbness in the dorsum of the foot. Her straight leg raise is positive at 30 degrees. MRI shows a large L4/5 disc herniation. Which nerve root is most likely compressed?
Correct Answer & Explanation
. L5 nerve root
Explanation
A disc herniation at the L4/5 level typically compresses the L5 nerve root. The clinical presentation described is classic for L5 radiculopathy: pain radiating down the lateral aspect of the thigh and leg to the dorsum of the foot, numbness in the L5 dermatome (dorsum of the foot, particularly the first web space), and a positive straight leg raise. Motor weakness, if present, would involve ankle dorsiflexion (foot drop) and toe extension. An L5 radiculopathy is distinct from L4 (knee extension weakness, medial leg/foot numbness) or S1 (ankle plantarflexion weakness, lateral foot numbness, diminished ankle reflex).
Question 6752
Topic: 6. Spine
A 48-year-old male presents with worsening lower back pain, bilateral leg numbness, and progressive weakness, particularly in his quadriceps muscles. He describes his symptoms as being worse with standing and walking, and relieved by sitting or leaning forward (shopping cart sign). Physical examination reveals diminished patellar reflexes and weak knee extension bilaterally. MRI shows severe degenerative changes at L3-L4 and L4-L5 with significant narrowing of the spinal canal. What is the most appropriate initial management approach?
Correct Answer & Explanation
. Trial of non-steroidal anti-inflammatory drugs (NSAIDs) and physical therapy focusing on flexion exercises
Explanation
The patient's symptoms (neurogenic claudication, 'shopping cart sign,' motor weakness, diminished reflexes) are classic for lumbar spinal stenosis. The initial management for symptomatic lumbar spinal stenosis, especially without acute neurological deficits (e.g., cauda equina syndrome), is typically conservative. This involves a trial of NSAIDs, activity modification, and physical therapy focused on flexion exercises to open the spinal canal, improve posture, and strengthen core muscles. Epidural steroid injections can provide temporary symptomatic relief. Surgical decompression and fusion are reserved for those who fail conservative management or develop progressive neurological deficits. Rigid bracing is generally not effective and can lead to muscle atrophy. Progressive resistance exercises are often part of physical therapy but not a standalone initial approach.
Question 6753
Topic: 6. Spine
A 60-year-old female presents with a 6-month history of progressive clumsiness, difficulty with fine motor tasks (e.g., buttoning shirts), and gait instability. She denies acute trauma. On examination, she has hyperreflexia in the lower extremities, a positive Babinski sign, and a wide-based, spastic gait. Sensory examination reveals decreased vibratory sensation in her feet. MRI of the cervical spine shows severe multilevel degenerative changes with cord compression at C5-C6 and C6-C7. What is the most appropriate management?
Correct Answer & Explanation
. Surgical decompression and stabilization (e.g., anterior cervical discectomy and fusion or laminoplasty)
Explanation
The patient's symptoms and signs (clumsiness, fine motor difficulty, gait instability, hyperreflexia, Babinski sign, sensory deficits) are indicative of cervical myelopathy due to cord compression. This is a progressive neurological condition. Surgical decompression and stabilization (e.g., ACDF or laminoplasty) is the definitive treatment to halt progression of neurological deficits and, in some cases, achieve improvement. Conservative management, such as collars, physical therapy, or injections, does not address the underlying cord compression and is generally ineffective for established myelopathy; they may be considered for radiculopathy without myelopathy. Observation carries the risk of continued and potentially irreversible neurological decline.
Question 6754
Topic: 6. Spine
A 35-year-old male with a history of intravenous drug use presents with acute onset back pain and fever. He has tenderness to palpation over the L4-L5 vertebral bodies. Laboratory tests show elevated ESR, CRP, and WBC count. MRI of the lumbar spine reveals fluid collection and enhancement consistent with discitis and vertebral osteomyelitis at L4-L5. What is the most appropriate initial management?
Correct Answer & Explanation
. Percutaneous biopsy for culture and histology, followed by targeted intravenous antibiotics
Explanation
The patient's presentation (fever, back pain, tenderness, IV drug use, elevated inflammatory markers, MRI findings) is highly suspicious for bacterial discitis and vertebral osteomyelitis. The most appropriate initial management, after confirming the diagnosis with imaging, is to obtain a percutaneous biopsy for culture and histology. This identifies the causative organism, allowing for targeted intravenous antibiotic therapy. While surgical debridement and stabilization may eventually be necessary for neurological deficits, spinal instability, or failed medical management, it is not the immediate first step. Long-term oral antibiotics alone are insufficient. Radiation therapy is for malignancy.
Question 6755
Topic: 6. Spine
You are presenting a case of degenerative lumbar spinal stenosis. What specific element of your management discussion would most impress an examiner regarding comprehensive patient care?
Correct Answer & Explanation
. Detailed discussion of non-operative measures (physiotherapy, injections, activity modification), shared decision-making regarding surgical indications (failed conservative care, neurological deficit), and expected outcomes.
Explanation
For degenerative conditions like spinal stenosis, a comprehensive, high-scoring management plan starts with a robust discussion of non-operative measures, their rationale, and expected effectiveness. It then transitions to surgical options, clearly outlining indications (e.g., progressive neurological deficit, failed conservative management), surgical goals, risks, and expected outcomes, all within the context of shared decision-making. This holistic approach demonstrates excellent clinical judgment.
Question 6756
Topic: Thoracolumbar Spine & Deformity
You are discussing the role of bracing for scoliosis in adolescents. To demonstrate a nuanced understanding for the examiner, you should emphasize:
Correct Answer & Explanation
. The specific indications (e.g., Risser sign, curve magnitude, remaining growth potential), the goal of bracing (to prevent progression, not correct the curve), and the importance of patient compliance.
Explanation
For scoliosis bracing, a high-scoring answer requires understanding the specific indications, the biomechanical principles, and, crucially, the realistic goals. Bracing aims to halt or slow progression in skeletally immature patients with moderate curves, not to correct them. Patient compliance is paramount for success. Discussing these factors demonstrates a comprehensive grasp of the management strategy.
Question 6757
Topic: 6. Spine
When detailing the post-operative care of a patient who underwent microdiscectomy for lumbar disc herniation, what aspect demonstrates the most comprehensive understanding to an examiner?
Correct Answer & Explanation
. Early mobilization with activity modification, progressive core strengthening and physiotherapy, appropriate wound care, and clear return-to-activity guidelines, emphasizing patient education on posture and lifting mechanics.
Explanation
Comprehensive post-operative care for microdiscectomy involves more than just pain control. It emphasizes early mobilization with specific activity restrictions to protect the repair, structured physiotherapy focusing on core strengthening and flexibility, wound care, and extensive patient education on ergonomics, posture, and lifting mechanics to prevent recurrence. This holistic approach to recovery and prevention scores highly.
Question 6758
Topic: 6. Spine
When discussing imaging for suspected spinal infections (e.g., discitis/osteomyelitis), which imaging modality is considered the gold standard for diagnosis and assessment of extent?
Correct Answer & Explanation
. MRI with gadolinium contrast.
Explanation
MRI with gadolinium contrast is the gold standard for diagnosing spinal infections (discitis, osteomyelitis, epidural abscess). It provides superior soft tissue resolution, allowing visualization of early inflammatory changes, marrow edema, disc space involvement, and epidural phlegmon/abscess formation, which are crucial for diagnosis, staging, and surgical planning. Plain X-rays are often delayed, and CT is better for bony destruction but less sensitive for early infection.
Question 6759
Topic: 6. Spine
When evaluating a patient with persistent back pain and suspected cauda equina syndrome, what is the most critical immediate action for optimal marking?
Correct Answer & Explanation
. Urgent clinical assessment for red flag symptoms (saddle anesthesia, bowel/bladder dysfunction, bilateral leg weakness), followed by immediate MRI of the lumbar spine, and neurosurgical/spinal surgery consultation for potential emergent decompression.
Explanation
Cauda Equina Syndrome (CES) is a surgical emergency. Optimal marking requires recognizing the urgency: immediate clinical assessment for red flag symptoms, followed by emergent MRI of the lumbar spine, and prompt neurosurgical/spinal surgery consultation for potential urgent decompression. Any delay can lead to permanent neurological deficits. This demonstrates critical clinical judgment and prioritization.
Question 6760
Topic: 6. Spine
You are discussing the indications for spinal fusion in degenerative conditions. The examiner asks, 'What is the MOST compelling indication for adding fusion to decompression in a patient with lumbar spinal stenosis?'
Correct Answer & Explanation
. Pre-existing spinal instability (e.g., degenerative spondylolisthesis) or iatrogenic instability created by extensive decompression (e.g., bilateral facetectomy).
Explanation
The most compelling indication for adding spinal fusion to decompression in lumbar stenosis is the presence of pre-existing spinal instability, such as degenerative spondylolisthesis (especially grades I and II) that is symptomatic, or the potential for iatrogenic instability created by a necessary extensive decompression (e.g., bilateral facetectomy, significant removal of stabilizing posterior elements). In these scenarios, decompression alone can worsen instability or lead to future instability, justifying fusion to maintain stability. While the other options can be contributing factors, they are not as direct or compelling indications for fusion as instability.
Test Yourself
Switch to an interactive, timed exam simulation to truly master this topic.