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Question 3361

Topic: 6. Spine

A 68-year-old male presents with bilateral leg and buttock pain that worsens with walking. You are attempting to distinguish between neurogenic claudication due to lumbar spinal stenosis and vascular claudication. Which of the following historical features is the hallmark of neurogenic claudication?

. Pain relief is achieved rapidly by simply standing still
. Pain is rapidly exacerbated when walking up a steep incline
. Pain relief is achieved with lumbar flexion, such as leaning on a shopping cart
. Decreased pedal pulses are noted after walking short distances
. Symmetric absence of deep tendon reflexes in the lower extremities

Correct Answer & Explanation

. Pain relief is achieved with lumbar flexion, such as leaning on a shopping cart


Explanation

Neurogenic claudication is highly posture-dependent. Lumbar flexion (e.g., sitting, leaning forward on a shopping cart, or walking uphill) increases the cross-sectional area of the spinal canal and neural foramina, providing pain relief. Vascular claudication is relieved by resting (standing still) regardless of posture, and is worsened by walking uphill due to increased metabolic demand.

Question 3362

Topic: 6. Spine

A 65-year-old man presents with progressive clumsiness in his hands and difficulty with balance. Examination demonstrates hyperreflexia, a positive Hoffmann sign, and a positive inverted radial reflex. According to the Nurick classification, a patient whose gait abnormality prevents employment but who walks unassisted is classified as:

. Grade 1
. Grade 2
. Grade 3
. Grade 4
. Grade 5

Correct Answer & Explanation

. Grade 3


Explanation

Nurick Grade 3 describes a patient with a gait abnormality that prevents employment, but who can still walk unassisted. Grade 1: Signs of cord involvement but normal gait. Grade 2: Mild gait involvement, fully employed. Grade 4: Ambulates only with assistance (walker/cane). Grade 5: Chair-bound or bedridden.

Question 3363

Topic: Thoracolumbar Spine & Deformity

A 16-year-old female presents with low back pain and a grade II L5-S1 isthmic spondylolisthesis. Which of the following spinopelvic parameters is highly correlated with the risk of progression in isthmic spondylolisthesis and is a fixed morphological parameter that does not change with patient positioning?

. Pelvic tilt
. Sacral slope
. Pelvic incidence
. Lumbar lordosis
. Sagittal vertical axis

Correct Answer & Explanation

. Pelvic incidence


Explanation

Pelvic incidence (PI) is a fixed anatomical parameter unique to each individual and does not change with posture (PI = Pelvic Tilt + Sacral Slope). A high pelvic incidence is strongly correlated with the development and progression of L5-S1 isthmic spondylolisthesis due to the resultant higher shear forces at the lumbosacral junction.

Question 3364

Topic: 6. Spine

In a patient with cervical spondylotic myelopathy, the presence of an inverted supinator reflex localizes the primary compressive pathology to which cervical cord level?

. C3-C4
. C4-C5
. C5-C6
. C6-C7
. C7-T1

Correct Answer & Explanation

. C5-C6


Explanation

The inverted supinator (brachioradialis) reflex is characterized by finger flexion (or wrist extension) when the brachioradialis tendon is tapped, without the normal elbow flexion. This indicates a lower motor neuron lesion at the C5-C6 level (absent brachioradialis reflex) and an upper motor neuron lesion below this level (hyperactive finger flexors, C8), effectively localizing the spinal cord compression to the C5-C6 level.

Question 3365

Topic: Cervical Spine

An 82-year-old male with multiple medical comorbidities sustains a Type II odontoid fracture after a ground-level fall. The fracture is displaced 2 mm anteriorly. His neurologic exam is completely intact. What is the most appropriate initial management considering his age and fracture pattern?

. Halo vest immobilization
. Surgical stabilization with an anterior odontoid screw
. Posterior C1-C2 instrumental fusion
. Rigid cervical collar immobilization
. Cervical traction and prolonged bed rest

Correct Answer & Explanation

. Rigid cervical collar immobilization


Explanation

In elderly patients (>80 years) with multiple comorbidities, a rigid cervical collar is often the most appropriate management for a minimally displaced Type II odontoid fracture. Halo vest immobilization is poorly tolerated and associated with high mortality in the elderly. While surgical stabilization (posterior fusion) may increase union rates, the perioperative risk is high. A stable, fibrous nonunion treated in a collar is frequently asymptomatic and acceptable in this population.

Question 3366

Topic: 6. Spine

A 62-year-old male is evaluated for cervical spondylotic myelopathy. An MRI of the cervical spine is obtained. Which of the following MRI signal characteristics within the spinal cord is most highly predictive of myelomalacia and correlates with poor neurological recovery following decompressive surgery?

. T1 hyperintensity and T2 hypointensity
. T1 isointensity and focal T2 hyperintensity
. T1 hypointensity and T2 hyperintensity
. Diffuse uniform T1 enhancement post-gadolinium
. T2 hypointensity without T1 signal change

Correct Answer & Explanation

. T1 hypointensity and T2 hyperintensity


Explanation

In cervical spondylotic myelopathy, T2 hyperintensity in the cord represents edema, inflammation, or gliosis. However, when combined with T1 hypointensity, it indicates irreversible cord damage, cystic necrosis, or myelomalacia. This combination is a well-established poor prognostic factor for neurological recovery following surgical decompression.

Question 3367

Topic: Thoracolumbar Spine & Deformity

A 35-year-old man falls from a height and sustains a T12 burst fracture. He is neurologically intact. MRI demonstrates complete disruption of the posterior ligamentous complex (PLC). According to the Thoracolumbar Injury Classification and Severity (TLICS) score, what is his total score and the recommended management?

. 2 points; non-operative management
. 4 points; operative or non-operative management
. 5 points; operative management
. 7 points; operative management
. 8 points; operative management

Correct Answer & Explanation

. 5 points; operative management


Explanation

The TLICS system scores three categories: Morphology (Burst = 2 points), Neurological Status (Intact = 0 points), and PLC Integrity (Disrupted = 3 points). Total score = 2 + 0 + 3 = 5. A TLICS score of >4 points is an indication for operative management. A score of <4 indicates non-operative, and 4 is at the surgeon's discretion.

Question 3368

Topic: 6. Spine

A 65-year-old man presents with deteriorating handwriting, dropping objects, and gait instability. On physical examination, tapping the brachioradialis tendon at the distal radius elicits paradoxical flexion of the fingers without the normal elbow flexion or forearm supination. This specific localizing sign is known as:

. Hoffmann's sign
. Inverted brachioradialis reflex
. Wartenberg's sign
. Finger escape sign
. Tromner's sign

Correct Answer & Explanation

. Inverted brachioradialis reflex


Explanation

The inverted brachioradialis (or supinator) reflex is a highly specific sign of cervical myelopathy. It indicates a lower motor neuron lesion at the C5-C6 level (absent brachioradialis reflex) combined with an upper motor neuron lesion below that level (hyperactive finger flexors, mediated by C8-T1). It is pathognomonic for spinal cord compression at the C5-C6 level.

Question 3369

Topic: 6. Spine

A 55-year-old male presents with progressive clumsiness in his hands and a broad-based gait. Imaging reveals Ossification of the Posterior Longitudinal Ligament (OPLL) in the cervical spine. Which of the following radiographic findings is a relative contraindication to performing a cervical laminoplasty alone in this patient?

. K-line positive alignment
. Lordotic cervical alignment
. OPLL occupying 30% of the spinal canal
. K-line negative alignment
. Concomitant mild cervical radiculopathy

Correct Answer & Explanation

. K-line negative alignment


Explanation

The K-line connects the mid-anterior posterior canal at C2 to C7. If the OPLL mass exceeds this line (K-line negative, usually implying kyphosis or a massive anterior lesion), the spinal cord will not shift posteriorly sufficient enough to decompress after laminoplasty. In K-line negative patients, an anterior decompression or a posterior instrumented fusion with deformity correction is preferred.

Question 3370

Topic: 6. Spine

A 65-year-old male presents with bilateral leg pain that worsens after walking 2 blocks. Physical examination shows absent Achilles reflexes but intact knee reflexes, with palpable pedal pulses. Which of the following historical findings most reliably differentiates neurogenic claudication from vascular claudication?

. Pain relief requiring the patient to stand completely still for 5 minutes
. A decreased Ankle-Brachial Index (ABI) after exercise
. Pain starting in the calves and radiating proximally
. Pain relief experienced when sitting or leaning forward over a shopping cart
. Cramping pain in the buttocks with exertion

Correct Answer & Explanation

. Pain relief experienced when sitting or leaning forward over a shopping cart


Explanation

Neurogenic claudication (due to lumbar spinal stenosis) is classically relieved by lumbar flexion (e.g., sitting or bending forward over a shopping cart), which increases the cross-sectional area of the spinal canal. Vascular claudication is relieved by simply resting (standing still) and does not improve specifically with postural flexion.

Question 3371

Topic: 6. Spine
A patient sustains a traumatic spondylolisthesis of the axis (Hangman's fracture). Imaging shows angulation with minimal translation, and the fracture gap widens upon cervical traction. According to the Levine-Edwards classification, what type of fracture is this, and what is the appropriate initial management?
. Type I; rigid cervical collar
. Type II; halo vest immobilization
. Type IIA; compression in a halo vest
. Type III; immediate surgical stabilization
. Type IIA; rigid cervical collar

Correct Answer & Explanation

. Type IIA; compression in a halo vest


Explanation

A Levine-Edwards Type IIA Hangman's fracture is characterized by significant angulation with minimal translation. Traction is contraindicated as it widens the fracture gap (due to an intact anterior longitudinal ligament but disrupted posterior longitudinal ligament and disc). Management involves gentle compression and extension in a halo vest.

Question 3372

Topic: 6. Spine

A 68-year-old male complains of bilateral leg pain that worsens after walking two blocks. The pain is relieved by sitting or leaning forward over a shopping cart. He states that riding a stationary bicycle does not provoke the pain. Examination reveals intact distal pulses. What is the most likely diagnosis?

. Peripheral arterial disease
. Lumbar spinal stenosis
. Lumbar disc herniation
. Diabetic peripheral neuropathy
. Deep vein thrombosis

Correct Answer & Explanation

. Lumbar spinal stenosis


Explanation

This is a classic presentation of neurogenic claudication secondary to lumbar spinal stenosis. The pain is relieved by spinal flexion (e.g., sitting, leaning over a shopping cart, cycling), which increases the cross-sectional area of the spinal canal. Vascular claudication is brought on by muscle ischemia regardless of spinal posture (e.g., cycling would still cause pain) and typically presents with diminished pulses.

Question 3373

Topic: 6. Spine

A 35-year-old male sustains a C2 traumatic spondylolisthesis (Hangman's fracture). Imaging reveals a fracture through the pars interarticularis with severe angulation, but minimal translation. The C2-C3 disc space is widened posteriorly. Based on the Levine and Edwards classification, what is the mechanism of injury and the appropriate initial treatment?

. Hyperextension and axial loading; rigid cervical collar
. Hyperextension and axial loading; anterior cervical discectomy and fusion
. Flexion and distraction; initial application of halo vest with slight extension
. Flexion and distraction; initial application of halo vest with slight compression and extension
. Flexion and compression; C1-C3 posterior fusion

Correct Answer & Explanation

. Flexion and distraction; initial application of halo vest with slight compression and extension


Explanation

A Levine and Edwards Type IIA Hangman's fracture features severe angulation with minimal translation and a widened posterior C2-C3 disc space. The mechanism is flexion-distraction. Traction is contraindicated as it exacerbates displacement. Treatment is halo application in slight compression and extension to close the posterior hinge.

Question 3374

Topic: Thoracolumbar Spine & Deformity

A 14-year-old gymnast presents with persistent lower back pain exacerbated by extension. Radiographs reveal a Grade II L5-S1 isthmic spondylolisthesis. After 6 months of conservative management including bracing and physical therapy, her pain remains debilitating. What is the most appropriate surgical intervention?

. L5-S1 anterior lumbar interbody fusion (ALIF) without posterior instrumentation
. L5 laminectomy and pars interarticularis repair (Buck's procedure)
. L5-S1 posterior instrumented fusion with autogenous bone graft
. L4-S1 posterior instrumented fusion
. In situ uninstrumented posterolateral fusion of L5-S1

Correct Answer & Explanation

. L4-S1 posterior instrumented fusion


Explanation

In an adolescent with a symptomatic Grade II isthmic spondylolisthesis that has failed conservative management, the standard surgical treatment is an L5-S1 posterior instrumented fusion. Pars repairs are reserved for defects with no significant slip (Grade 0 or early Grade I).

Question 3375

Topic: 6. Spine

A 35-year-old male is involved in a high-speed motor vehicle collision. Imaging reveals a traumatic spondylolisthesis of C2 (Hangman's fracture). The fracture passes through the pars interarticularis. Lateral radiographs demonstrate severe anterior angulation of C2 on C3, but with minimal anterior translation. The disc space is disrupted posteriorly. Based on the Levine and Edwards classification, what is the most appropriate initial management?

. Heavy skull traction (15-20 lbs) to reduce the angulation
. Gardner-Wells tongs with 5 lbs traction and slight extension
. Halo vest application with initial gentle compression and neutral positioning, strictly avoiding traction
. Immediate anterior cervical discectomy and fusion (ACDF) of C2-C3
. Immediate posterior C1-C3 instrumented fusion

Correct Answer & Explanation

. Halo vest application with initial gentle compression and neutral positioning, strictly avoiding traction


Explanation

This is a Levine-Edwards Type IIA Hangman's fracture, characterized by severe angulation and minimal translation, typically resulting from a flexion-distraction mechanism. The posterior longitudinal ligament and disc are significantly disrupted. Crucially, longitudinal traction is strongly contraindicated in Type IIA fractures because it will cause over-distraction and potential neurological injury. The correct treatment is gentle compression to reduce the angulation, followed by halo vest immobilization or surgical stabilization if non-operative measures fail.

Question 3376

Topic: 6. Spine

During the physical examination of a 70-year-old male presenting with clumsiness in his hands and broad-based gait, you ask him to fully extend his fingers, and then you observe that the small (ulnar) fingers spontaneously abduct and he is unable to hold them together with the other fingers. This specific finding is known as:

. Grip and release test
. Hoffmann's sign
. Finger escape sign
. Wartenberg's sign
. Inverted radial reflex

Correct Answer & Explanation

. Finger escape sign


Explanation

The clinical sign described is the 'finger escape sign,' which is a prominent feature of cervical spondylotic myelopathy (often grouped under the broader term 'myelopathy hand'). It occurs due to profound weakness of the intrinsic hand muscles (interossei) caused by upper motor neuron compromise, leading to the inability to maintain adduction of the ulnar digits. Wartenberg's sign (ulnar neuropathy) also features an abducted small finger, but the finger escape sign in this context of broader myelopathic symptoms (broad gait, clumsiness) points to cord compression.

Question 3377

Topic: 6. Spine

A 45-year-old man presents after a high-speed motor vehicle collision. CT shows a fracture through the pars interarticularis of C2 with 4 mm of anterior translation of C2 on C3 and severe angulation. According to the Levine-Edwards classification, this is a Type IIA Hangman's fracture. What is the mechanism of this specific injury type and the recommended treatment?

. Hyperextension-axial loading; treated with a hard cervical collar
. Hyperextension-axial loading; treated with anterior cervical discectomy and fusion
. Flexion-distraction; treated with immediate halo vest application in maximal extension with heavy traction
. Flexion-distraction; treated with closed reduction under fluoroscopy applying gentle compression and slight extension, followed by halo vest
. Axial loading; treated with occipitocervical fusion

Correct Answer & Explanation

. Flexion-distraction; treated with closed reduction under fluoroscopy applying gentle compression and slight extension, followed by halo vest


Explanation

A Levine-Edwards Type IIA Hangman's fracture features minimal translation but severe angulation. The mechanism is flexion-distraction. Crucially, cervical traction is strictly contraindicated as it will exacerbate the distraction, potentially causing severe neurological injury. Treatment typically involves cautious closed reduction under fluoroscopy using gentle compression and slight extension to close the disk space hinge, followed by halo vest immobilization.

Question 3378

Topic: 6. Spine

A patient sustains a cervical spine injury. On examination, there is zero motor function below the level of injury. Pinprick and light touch sensation are absent throughout the lower extremities, but the patient retains deep anal pressure and perianal sensation. According to the American Spinal Injury Association (ASIA) Impairment Scale, how is this injury graded?

. ASIA A
. ASIA B
. ASIA C
. ASIA D
. ASIA E

Correct Answer & Explanation

. ASIA B


Explanation

The ASIA Impairment Scale evaluates spinal cord injuries: ASIA A = Complete (no sensory/motor function preserved in sacral segments S4-S5). ASIA B = Sensory Incomplete (sensory, but no motor function, preserved below the neurological level and includes sacral segments). ASIA C = Motor Incomplete (motor function preserved, more than half of key muscles below the level have a grade <3). ASIA D = Motor Incomplete (motor function preserved, at least half of key muscles have grade >=3). Because this patient retains perianal sensation (sacral sparing) but has no motor function, it is graded ASIA B.

Question 3379

Topic: 6. Spine

A 45-year-old male presents with severe radicular leg pain. Magnetic resonance imaging reveals a large paracentral disc herniation at the L4-L5 level compressing the traversing nerve root. Physical examination is most likely to demonstrate which of the following focal deficits?

. Weakness in ankle dorsiflexion and great toe extension
. Weakness in ankle plantarflexion
. Diminished or absent patellar reflex
. Diminished or absent Achilles reflex
. Sensory loss over the lateral aspect of the foot

Correct Answer & Explanation

. Weakness in ankle dorsiflexion and great toe extension


Explanation

In the lumbar spine, a paracentral disc herniation compresses the traversing nerve root. At L4-L5, the traversing root is L5. L5 radiculopathy is characterized by weakness in great toe extension (extensor hallucis longus) and ankle dorsiflexion (tibialis anterior), along with sensory changes over the dorsal aspect of the foot. Diminished patellar reflex implies L4 (exiting root), while diminished Achilles reflex implies S1.

Question 3380

Topic: 6. Spine

A 45-year-old male presents with right-sided neck pain radiating down his arm. He complains of weakness when trying to extend his elbow and numbness over the dorsal aspect of his middle finger. The triceps reflex is diminished. Which cervical nerve root is most likely compressed?

. C5
. C6
. C7
. C8
. T1

Correct Answer & Explanation

. C7


Explanation

C7 radiculopathy is the most common cervical radiculopathy. It typically presents with triceps weakness, weakness in wrist flexion or finger extension, numbness in the middle finger, and a diminished triceps reflex. C5 affects the deltoid/biceps reflex; C6 affects the wrist extensors/brachioradialis reflex; C8 affects finger flexors; T1 affects intrinsic hand muscles.