Orthopedic Spine Review | Dr Hutaif Spine Surgery Revie -...

Question 1

A 14-year-old gymnast presents with lower back pain exacerbated by extension. Radiographs show a grade II spondylolisthesis at L5-S1. What is the most likely pathological mechanism?

Explanation

Isthmic spondylolisthesis in young athletes (especially gymnasts and football linemen) is typically due to repetitive hyperextension leading to stress fractures of the pars interarticularis (spondylolysis) which may progress to spondylolisthesis.

Question 2

A 65-year-old man presents with progressive clumsiness in his hands, difficulty buttoning his shirt, and a broad-based gait. Hoffman's sign is positive bilaterally. MRI shows severe cervical stenosis at C4-C6. What is the most reliable MRI predictor of poor surgical outcome after decompression?

Explanation

T1 hypointensity within the cord on MRI represents myelomalacia/cystic necrosis and is a strong predictor of a poor neurological recovery following decompression in cervical spondylotic myelopathy. T2 hyperintensity alone is less prognostic unless very bright and extensive.

Question 3

A 13-year-old Risser 1 female presents with a right thoracic curve of 35 degrees. What is the most appropriate management?

Explanation

In a skeletally immature patient (Risser 0-2) with an AIS curve between 25 and 45 degrees, full-time bracing (TLSO) for 16-18+ hours per day is recommended to prevent curve progression.

Question 4

A 35-year-old male falls from a height and sustains an L1 burst fracture. He is neurologically intact. Radiographs and CT show 20 degrees of kyphosis, 50% loss of vertebral body height, and 40% canal compromise. What is the most appropriate initial treatment?

Explanation

Neurologically intact patients with thoracolumbar burst fractures and stable posterior ligamentous complexes can typically be treated non-operatively with a TLSO brace. Canal compromise itself (even up to 50%) will frequently remodel, and without neurological deficit or severe kyphosis (>30 degrees), nonoperative management is the standard of care.

Question 5

An 80-year-old woman is involved in a low-speed motor vehicle collision. CT scan reveals a Type II odontoid fracture with 2 mm of posterior displacement. She is neurologically intact. What is the most appropriate treatment?

Explanation

In elderly patients (>65 years) with Type II odontoid fractures, morbidity and mortality from rigid halo vest immobilization are significantly high. A hard cervical collar is typically recommended for initial management of minimally displaced fractures in this age group, balancing the high risk of nonunion against the risks of surgery or a halo.

Question 6

A 55-year-old man with a long-standing history of ankylosing spondylitis presents with severe back pain after a minor fall. Radiographs do not clearly show a fracture, but he has pinpoint tenderness at T10. What is the next best step in management?

Explanation

Patients with ankylosing spondylitis have highly rigid and osteoporotic spines. Any minor trauma causing new pain must be treated as a spinal fracture until proven otherwise. Because plain films often miss these highly unstable, shear-type fractures (Chalk stick fractures), advanced imaging (CT or MRI) of the entire spine is mandatory.

Question 7

A 30-year-old man presents after a motor vehicle accident with neck pain. Imaging shows a traumatic spondylolisthesis of the axis (C2) with bilateral pars fractures, 4 mm of translation, and 12 degrees of angulation (Levine-Edwards Type II). What is the recommended treatment?

Explanation

Levine-Edwards Type II Hangman's fractures (significant translation and angulation, disrupted C2-3 disc) are typically treated with reduction via traction followed by Halo vest immobilization. Type I can be treated with a hard collar, and Type III (associated with bilateral C2-C3 facet dislocation) requires open reduction and internal fixation.

Question 8

A 42-year-old man presents with 6 weeks of right leg pain radiating down the lateral aspect of his calf to the dorsum of his foot. He has a 3/5 weakness in extensor hallucis longus (EHL). He has failed conservative therapy. Which nerve root is most likely compressed?

Explanation

The clinical presentation of lateral calf pain, dorsal foot pain, and EHL weakness is classic for an L5 radiculopathy. In the lumbar spine, a paracentral disc herniation at L4-L5 most commonly compresses the traversing L5 nerve root.

Question 9

A 72-year-old man with a history of cervical stenosis falls forward, striking his chin. He presents with profound upper extremity weakness, particularly in his hands, but is able to walk with a spastic gait. His lower extremities have 4/5 strength. What is the most likely pathophysiological mechanism?

Explanation

Central cord syndrome classically occurs in elderly patients with pre-existing cervical spondylosis who sustain a hyperextension injury. The spinal cord is compressed anteriorly by osteophytes/disc and posteriorly by the buckled ligamentum flavum, leading to central cord edema or hemorrhage.

Question 10

A 25-year-old motorcyclist sustains a Denis Zone 3 sacral fracture. Which of the following deficits is most likely to be associated with this injury pattern?

Explanation

Denis Zone 3 sacral fractures involve the central sacral canal and carry a high rate (up to 50-60%) of neurological injury, specifically saddle anesthesia, bowel, bladder, and sexual dysfunction (sacral plexus/cauda equina injury).

Question 11

A 55-year-old intravenous drug user presents with progressive back pain, fevers, and acute onset of lower extremity weakness and urinary retention. MRI reveals an epidural fluid collection with peripheral enhancement compressing the thecal sac at T10. What is the most appropriate management?

Explanation

A spinal epidural abscess presenting with acute neurological deficits (weakness, urinary retention) is a surgical emergency. Urgent decompressive laminectomy and debridement are required to prevent permanent neurological damage.

Question 12

A 6-year-old boy presents with a low posterior hairline, short webbed neck, and limited cervical range of motion. Radiographs show multiple fused cervical vertebrae. Which of the following systems is most crucial to evaluate in this patient?

Explanation

Klippel-Feil syndrome is characterized by congenital fusion of cervical vertebrae. It is highly associated with congenital anomalies of the genitourinary system (up to 30%), most commonly unilateral renal agenesis. Therefore, a renal ultrasound is routinely recommended.

Question 13

A 40-year-old male presents to the emergency department with acute onset severe lower back pain, bilateral sciatica, perineal numbness, and inability to void for the past 12 hours. Post-void residual volume is 500 cc. MRI shows a massive L4-L5 disc extrusion filling the spinal canal. What is the optimal timeframe for surgical intervention to maximize the chance of full neurological recovery?

Explanation

Cauda equina syndrome is a surgical emergency. The current consensus is that surgical decompression should be performed as soon as possible, ideally within 24 to 48 hours of the onset of sphincter dysfunction, to maximize the chances of recovering bowel and bladder function.

Question 14

A 68-year-old female presents with neurogenic claudication and L4-L5 grade I degenerative spondylolisthesis. She has failed 6 months of conservative treatment. Dynamic radiographs show 4 mm of translation upon flexion. What is the gold standard surgical treatment?

Explanation

In degenerative spondylolisthesis with mechanical instability and claudication, decompression alone (laminectomy) has a high rate of progressive slip and recurrent symptoms. The SPORT trial supports that the addition of an instrumented posterolateral fusion provides superior long-term clinical outcomes.

Question 15

A 16-year-old boy presents with an increasingly prominent mid-back curvature and aching pain after prolonged sitting. Lateral radiographs reveal a thoracic kyphosis of 65 degrees. What radiographic finding is necessary to confirm the diagnosis of Scheuermann's disease?

Explanation

Sorensen's criteria for the diagnosis of Scheuermann's kyphosis require the presence of structural kyphosis > 45 degrees, and anterior wedging of at least 5 degrees in 3 or more consecutive vertebral bodies.

Question 16

A 60-year-old Japanese male presents with progressive clumsiness of his hands, difficulty walking, and hyperreflexia in both upper and lower extremities. Lateral cervical radiograph reveals dense ossification extending vertically along the posterior aspect of the C3 to C6 vertebral bodies. Which surgical approach is generally preferred if the canal occupying ratio is 60% and cervical alignment is lordotic?

Explanation

For multilevel OPLL (>3 levels) with a high canal occupying ratio in a lordotic spine, a posterior approach such as laminoplasty is typically preferred. Anterior approaches for massive OPLL carry a very high risk of dural tears and spinal cord injury.

Question 17

A 55-year-old woman with a history of breast cancer presents with severe, progressive midthoracic back pain. Neurological exam reveals 4/5 strength in the bilateral iliopsoas and hyperreflexia at the knees. MRI shows a destructive lesion at T8 with epidural extension compressing the spinal cord. She has an estimated life expectancy of 18 months. What is the most appropriate management?

Explanation

In a patient with metastatic spinal cord compression from a solid tumor who has mechanical instability, progressive neurological deficit, and a reasonable life expectancy (>3-6 months), surgical decompression and stabilization followed by radiation therapy is superior to radiation alone.

Question 18

A 65-year-old female with long-standing Rheumatoid Arthritis presents with neck pain and occipital headaches. Lateral cervical flexion-extension radiographs show an anterior atlantodental interval (ADI) of 11 mm. What is the most appropriate management?

Explanation

In rheumatoid arthritis, anterior atlantoaxial subluxation is an indication for surgery when the ADI is > 9-10 mm. The standard surgical procedure for isolated C1-C2 instability without cranial settling is a posterior C1-C2 fusion.

Question 19

A 60-year-old man on warfarin for atrial fibrillation undergoes a lumbar laminectomy. Six hours postoperatively, he complains of excruciating back pain and develops profound, rapidly progressive bilateral lower extremity weakness and saddle anesthesia. What is the most urgent next step?

Explanation

The clinical presentation is classic for a postoperative spinal epidural hematoma causing cauda equina syndrome. Immediate surgical re-exploration and evacuation of the hematoma are indicated without waiting for advanced imaging, which would unnecessarily delay care.

Question 20

An 82-year-old female presents with acute severe midline back pain after lifting a heavy box. Radiographs reveal a new T12 compression fracture with 20% loss of anterior height and no posterior wall involvement. She is neurologically intact. What is the best initial management?

Explanation

The vast majority of osteoporotic vertebral compression fractures are stable and should initially be treated conservatively with a short period of bed rest, pain control, and early mobilization to prevent further deconditioning.

Question 21

A 5-year-old boy presents with a short neck, low posterior hairline, and limited cervical range of motion. Radiographs reveal congenital fusion of the C3-C4 and C5-C6 vertebral bodies. Which of the following is the most appropriate next screening test to evaluate for commonly associated anomalies?

Explanation

This patient exhibits the classic clinical triad of Klippel-Feil syndrome. Because the condition results from abnormal development of mesodermal tissue during embryogenesis, it is highly associated with other systemic anomalies. Genitourinary anomalies (up to 30% of patients), particularly unilateral renal agenesis, are common, making a baseline renal ultrasound an essential screening step. Cardiovascular anomalies (e.g., VSD) and Sprengel deformity are also frequent.

Question 22

A 65-year-old male undergoes a C3-C6 posterior cervical laminectomy and instrumented fusion for cervical spondylotic myelopathy. On post-operative day 2, he develops isolated, profound weakness of the right deltoid and biceps (Grade 2/5). Sensation is intact, and his lower extremity function is unchanged. Post-operative MRI shows adequate decompression with no epidural hematoma. What is the most likely etiology of this complication?

Explanation

Post-operative C5 palsy is a well-documented complication occurring in about 5-10% of patients undergoing cervical decompression (particularly multi-level posterior laminectomies). The most widely accepted mechanism is the 'tethering effect': as the spinal cord shifts posteriorly following decompression, tension is placed on the relatively short and horizontally oriented C5 nerve roots, leading to ischemic or traction neurapraxia. Most cases resolve spontaneously over months with conservative management.

Question 23

A 55-year-old male with a long-standing history of ankylosing spondylitis presents to the emergency department with severe back pain after a ground-level fall.

A CT scan demonstrates a fracture through the T8-T9 intervertebral disc space extending into the posterior elements. He is neurologically intact. What is the most appropriate management?

Explanation

Spinal fractures in patients with ankylosing spondylitis are highly unstable because the spine acts as a long, rigid lever arm. These fractures are considered pan-column injuries (often shear or extension mechanism) and have a high risk of displacement, epidural hematoma, and catastrophic neurological decline. Rigid posterior fixation with long constructs (typically 3 levels above and 3 levels below the injury) is the gold standard of care.

Question 24

In evaluating a patient for adult spinal deformity correction, which of the following spinopelvic parameters is morphological, established at skeletal maturity, and remains fixed regardless of patient positioning or pelvic retroversion?

Explanation

Pelvic Incidence (PI) is a morphological parameter that describes the anatomical relationship between the sacrum and the pelvis. It is calculated as the sum of Pelvic Tilt (PT) and Sacral Slope (SS). Because the sacroiliac joint is essentially immobile, PI becomes fixed at skeletal maturity and does not change with posture, making it the fundamental baseline measurement when calculating target lumbar lordosis (LL) during deformity correction (goal PI-LL mismatch < 10 degrees).

Question 25

A 45-year-old male presents with severe right anterior thigh pain and weakness in knee extension. An MRI of the lumbar spine reveals a far lateral (extraforaminal) disc herniation at the L3-L4 level on the right. Which nerve root is most likely compressed by this specific herniation?

Explanation

In the lumbar spine, far lateral (extraforaminal) disc herniations compress the exiting nerve root at that level. At L3-L4, the L3 nerve root exits the foramen and is thus compressed by a far lateral disc herniation. Conversely, a typical paracentral disc herniation at L3-L4 would compress the traversing L4 nerve root.

Question 26

During correction of an adolescent idiopathic scoliosis deformity, there is a sudden and sustained loss of motor evoked potentials (MEPs) bilaterally, while somatosensory evoked potentials (SSEPs) remain at baseline. The patient's mean arterial pressure (MAP) is currently 85 mmHg. What is the most appropriate immediate step in management?

Explanation

Isolated loss of MEPs with intact SSEPs suggests an anterior cord issue affecting the motor tracts, often due to mechanical stretch or ischemia. After informing the surgeon, optimizing hemodynamics (MAP > 85-90), and ensuring there is no technical/anesthetic failure, the immediate surgical step is to release the corrective distraction forces. Waiting to perform a wake-up test or continuing the procedure wastes critical time during which ischemic injury can become permanent.

Question 27

A 25-year-old male suffers a stab wound to the thoracic spine. Neurological examination reveals loss of motor function and proprioception in the right lower extremity, and loss of pain and temperature sensation in the left lower extremity. This presentation implies injury to which of the following combinations of spinal cord tracts?

Explanation

This describes Brown-Séquard syndrome, caused by a hemisection of the spinal cord (in this case, on the right side). Injury to the right corticospinal tract causes ipsilateral (right) motor loss. Injury to the right dorsal columns causes ipsilateral (right) loss of proprioception and vibration. Injury to the right spinothalamic tract causes contralateral (left) loss of pain and temperature, because the spinothalamic fibers cross the midline near their entry level in the spinal cord.

Question 28

A 14-year-old gymnast presents with chronic low back pain. Conservative management for 6 months has failed.

Radiographs demonstrate a Grade II isthmic spondylolisthesis at L5-S1. What is the recommended surgical treatment?

Explanation

For pediatric or adolescent patients with a symptomatic Grade I or II isthmic spondylolisthesis failing conservative management, the gold standard treatment is an in-situ or partially reduced L5-S1 posterior instrumented fusion (with or without interbody support). Direct pars repairs are generally reserved for L1-L4 defects or very early-stage L5 defects with minimal to no slip, not for a Grade II slip. Laminectomy alone would further destabilize the spine.

Question 29

An 82-year-old female presents with neck pain following a motor vehicle collision. CT scan reveals a Type II odontoid fracture. Comorbidities include severe COPD and osteoporosis. She is neurologically intact. If she is managed non-operatively with a rigid cervical collar, which of the following is an established major risk factor for non-union?

Explanation

Major risk factors for non-union of a Type II odontoid fracture include age over 65 years, initial fracture displacement > 5 mm, posterior displacement, and a fracture gap > 1 mm. Given her age, she is already at high risk, but among the choices provided, displacement > 5 mm is the classic, highly significant risk factor that strongly correlates with non-union in collar management.

Question 30

A 16-year-old male presents with a 6-month history of well-localized mid-back pain that is worse at night and dramatically improves with ibuprofen. Imaging reveals a 1.2 cm sclerotic lesion with a central lucent nidus in the left lamina of T8. What is the most appropriate definitive management if conservative measures are poorly tolerated?

Explanation

The clinical presentation and imaging (lesion < 2 cm, posterior elements, nighttime pain relieved by NSAIDs) are classic for an osteoid osteoma of the spine. When medical management (NSAIDs) is poorly tolerated or fails, CT-guided radiofrequency ablation (RFA) is the minimally invasive treatment of choice, provided the nidus is safely distanced from the spinal cord or nerve roots.

Question 31

A 55-year-old diabetic male presents with 2 weeks of worsening back pain and low-grade fever. MRI reveals a ventral epidural abscess from L2 to L4. He has full motor strength, intact sensation, normal bowel/bladder function, and no mechanical instability. Blood cultures rapidly grow methicillin-sensitive Staphylococcus aureus (MSSA). What is the most appropriate initial management?

Explanation

Spinal epidural abscesses (SEA) can be managed non-operatively with intravenous antibiotics if the patient is neurologically intact, the causative organism is known (from blood cultures or distant source), and there is no spinal instability or severe deformity. This is particularly relevant for ventral abscesses, which are difficult to safely access via a standard posterior approach without neural retraction.

Question 32

A 22-year-old male falls from a height of 30 feet. He has bilateral lower extremity weakness and perineal numbness.

Imaging demonstrates a transverse fracture through the S1-S2 level connecting bilateral longitudinal transforaminal sacral fractures (U-type fracture). What is the primary biomechanical goal of surgical fixation for this specific pattern?

Explanation

A U-type sacral fracture (Denis Zone III) creates a functional spinopelvic dissociation, meaning the axial skeleton (lumbar spine) is disconnected from the pelvis. The primary biomechanical goal of surgery is to reconstitute spinopelvic continuity and stabilize the spine to the pelvis, typically using lumbopelvic fixation (e.g., L4/L5 pedicle screws connected to iliac screws), combined with neural decompression if indicated.

Question 33

A 19-year-old female is involved in a high-speed motor vehicle collision wearing only a lap belt. Radiographs show a transverse fracture through the spinous process, pedicles, and vertebral body of L2. Based on the mechanism of injury, what is the most commonly associated concomitant pathology?

Explanation

The patient has a Chance fracture, which is a flexion-distraction injury classically associated with lap-belt use in motor vehicle collisions. These injuries are highly associated with concurrent intra-abdominal pathology (up to 40-50% of cases), particularly traumatic rupture or ischemia of hollow viscera (e.g., small bowel). A high index of suspicion and general surgery evaluation is critical.

Question 34

According to the Thoracolumbar Injury Classification and Severity Score (TLICS), which of the following cumulative scores serves as a definitive indication for operative management?

Explanation

The TLICS system guides treatment of thoracolumbar trauma based on morphology, neurological status, and the integrity of the posterior ligamentous complex (PLC). A score of 3 or less is typically treated non-operatively. A score of 4 is indeterminate and depends on surgeon preference/patient factors. A score of 5 or greater is a strong indication for operative stabilization.

Question 35

A 42-year-old male presents to the emergency department with acute onset of severe low back pain, bilateral sciatica, and subjective perineal numbness. Which of the following clinical evaluations is considered the most sensitive indicator for objective urinary retention in the setting of suspected cauda equina syndrome?

Explanation

Post-void residual (PVR) volume evaluation (via bladder ultrasound or straight catheterization) is highly sensitive for urinary retention, which is a hallmark of incomplete or complete cauda equina syndrome. A PVR of less than 100-200 mL has a high negative predictive value and makes the diagnosis of established cauda equina syndrome highly unlikely.

Question 36

Which of the following radiographic findings is most characteristic of early spinal tuberculosis (Pott's disease) when compared to pyogenic spondylodiscitis?

Explanation

A classic differentiating feature of spinal tuberculosis (Pott's disease) compared to pyogenic infections is the relative preservation of the intervertebral disc space until late in the disease process. Mycobacterium tuberculosis lacks the proteolytic enzymes that staphylococcal species possess, which rapidly degrade disc cartilage. Instead, TB spreads subligamentously (anterior longitudinal ligament), leading to anterior vertebral body destruction and severe angular kyphosis.

Question 37

During the physical examination of a patient with suspected cervical spondylotic myelopathy, the examiner firmly flicks the distal phalanx of the middle finger into flexion. A positive response consists of reflexive flexion of the interphalangeal joint of the thumb and index finger. What is the name of this clinical sign?

Explanation

Hoffmann's sign is an upper motor neuron (UMN) physical examination finding indicating cervical cord compression/myelopathy above the C5/C6 level. Lhermitte's sign refers to electrical shock-like sensations down the spine with neck flexion. Wartenberg's sign is the involuntary abduction of the fifth digit (ulnar nerve or myelopathy). Spurling's test assesses for cervical radiculopathy.

Question 38

A 60-year-old male of East Asian descent presents with progressive clumsiness in his hands and an unsteady gait.

Lateral cervical radiographs reveal a continuous, dense radiopaque stripe immediately posterior to the vertebral bodies from C3 to C6. What is the most likely diagnosis?

Explanation

The patient's demographics (East Asian descent), clinical presentation (myelopathy), and distinct radiographic finding (a dense ossified band along the posterior aspect of the vertebral bodies) are pathognomonic for Ossification of the Posterior Longitudinal Ligament (OPLL). This condition severely reduces canal diameter, leading to compressive myelopathy.

Question 39

Which of the following is an essential radiographic criterion for the diagnosis of Diffuse Idiopathic Skeletal Hyperostosis (DISH) according to Resnick and Niwayama?

Explanation

Resnick criteria for DISH include: 1) Flowing calcification/ossification along the anterolateral aspect of at least four contiguous vertebral bodies; 2) Relative preservation of disc height; and 3) Absence of apophyseal joint ankylosis and absence of sacroiliac joint erosion/fusion. The latter helps strongly differentiate DISH from ankylosing spondylitis.

Question 40

Within the Neurologic, Oncologic, Mechanical, and Systemic (NOMS) framework for evaluating metastatic spine tumors, which of the following tumor histologies is considered highly radioresistant, often prompting separation surgery followed by stereotactic radiosurgery (SRS) when causing epidural spinal cord compression?

Explanation

Renal cell carcinoma, melanoma, thyroid carcinoma, and gastrointestinal malignancies are classically considered radioresistant to conventional fractionated external beam radiation therapy (cEBRT). In the NOMS framework, high-grade epidural spinal cord compression from these tumors typically requires separation surgery (decompression to create a margin around the cord) followed by high-dose stereotactic radiosurgery (SRS).

Question 41

A 75-year-old man falls and complains of severe neck pain. Radiographs reveal a Type II odontoid fracture. Which of the following parameters is the most significant risk factor for nonunion if managed conservatively?

Explanation

Risk factors for nonunion in Type II odontoid fractures include initial displacement > 5 mm, age > 50 years, and posterior displacement. Surgery is generally indicated in these high-risk patients to prevent nonunion.

Question 42

A 35-year-old man falls from a 10-foot ladder. Imaging reveals an L1 burst fracture with widening of the interspinous distance, indicating a definite posterior ligamentous complex (PLC) disruption. He is neurologically intact. According to the Thoracolumbar Injury Classification and Severity (TLICS) score, what is the score and appropriate management?

Explanation

The TLICS score is calculated as follows: Burst fracture morphology (2 points) + definite PLC injury (3 points) + neurologically intact (0 points) = 5 points. A score of 5 or greater is an indication for operative management.

Question 43

A 60-year-old woman with a 20-year history of rheumatoid arthritis presents with progressive hand clumsiness and a broad-based gait. Cervical spine radiographs demonstrate atlantoaxial instability. What is the most critical radiographic parameter used to assess her risk of impending permanent neurological deterioration?

Explanation

The Posterior Atlanto-Dental Interval (PADI), also known as the Space Available for the Cord (SAC), is the most reliable predictor of neurologic recovery. A PADI of less than 14 mm indicates a high risk for neurologic compromise and warrants surgical intervention.

Question 44

A 72-year-old man with cervical spondylosis suffers a hyperextension injury. He presents with 2/5 strength in his bilateral upper extremities and 4/5 strength in his lower extremities. He has variable sensory loss. Which specific spinal tract injury is responsible for this classic presentation?

Explanation

This is Central Cord Syndrome, which disproportionately affects the upper extremities due to injury to the central portion of the spinal cord. In the corticospinal tract, the cervical motor fibers are located more medially than the lumbosacral fibers.

Question 45

A 45-year-old man develops acute, severe left anterior thigh pain and new-onset weakness in left knee extension. MRI of the lumbar spine reveals a massive far lateral (extraforaminal) disc herniation at the L3-L4 level on the left. Which nerve root is most likely compressed?

Explanation

In the lumbar spine, a far lateral (extraforaminal) disc herniation compresses the exiting nerve root at that level. Therefore, an L3-L4 far lateral disc herniation compresses the exiting L3 nerve root.

Question 46

A 60-year-old man presents with severe back pain and a solitary L2 vertebral body metastasis secondary to renal cell carcinoma. He has impending cord compression, and his estimated life expectancy is 18 months. What is the most appropriate surgical treatment strategy?

Explanation

Renal cell carcinoma metastases are highly vascular and famously radioresistant. Therefore, optimal treatment for an isolated spinal metastasis requires preoperative embolization (to reduce bleeding) followed by wide excision or en bloc spondylectomy.

Question 47

When applying the Lenke classification system for adolescent idiopathic scoliosis, a minor curve must be included in the surgical fusion construct if it is deemed 'structural'. What radiographic criterion defines a structural minor curve in the coronal plane?

Explanation

In the Lenke classification, a minor curve is considered structural if it fails to bend out to less than 25 degrees on dynamic supine side-bending radiographs, or if there is kyphosis of at least +20 degrees across that region.

Question 48

A 25-year-old diver impacts the bottom of a pool, sustaining an axial load injury. An open-mouth odontoid radiograph demonstrates a Jefferson fracture. According to Spence's rule, a combined lateral mass overhang of C1 on C2 greater than what measurement implies incompetence of the transverse alar ligament?

Explanation

Spence's rule states that a combined lateral mass displacement of C1 on C2 greater than 6.9 mm on an open-mouth odontoid view is highly suggestive of a ruptured transverse ligament, rendering the fracture highly unstable.

Question 49

A 40-year-old woman presents with saddle anesthesia, bilateral sciatica, and acute urinary retention with a post-void residual volume of 450 mL. MRI confirms a massive L4-L5 central disc extrusion. What is the generally accepted optimal time window to perform decompression to maximize the chance of urologic recovery?

Explanation

Cauda Equina Syndrome is a surgical emergency. The literature strongly supports that surgical decompression performed within 48 hours provides the best clinical outcomes for the recovery of bladder and bowel function.

Question 50

A 25-year-old male involved in a high-speed motor vehicle collision sustains a thoracolumbar fracture. Radiographs and CT demonstrate a fracture extending horizontally through the spinous process, pedicles, and vertebral body of L1. What is the primary pathomechanism of this specific injury pattern?

Explanation

A Chance fracture is a flexion-distraction injury where the axis of rotation is anterior to the anterior longitudinal ligament. This results in tension failure of the posterior, middle, and anterior columns.

Question 51

In an adult patient presenting with an L5-S1 isthmic spondylolisthesis and unilateral radicular leg pain, which nerve root is most commonly compressed, and what is the primary anatomical site of this compression?

Explanation

In L5-S1 isthmic spondylolisthesis, the L5 exiting nerve root is most commonly compressed. The compression typically occurs in the neural foramen due to the pars interarticularis pseudarthrosis and hypertrophic fibrocartilage.

Question 52

A 68-year-old male with pre-existing cervical spondylosis falls forward and strikes his chin, causing a hyperextension injury to his neck. On examination, he has motor strength of 2/5 in his hands and 4/5 in his lower extremities. What is the most likely diagnosis?

Explanation

Central cord syndrome most commonly occurs in elderly patients with pre-existing cervical spondylosis who sustain a hyperextension injury. It presents with motor weakness that is proportionally greater in the upper extremities than the lower extremities.

Question 53

A 55-year-old male with known renal cell carcinoma presents with progressive lower extremity weakness and bowel dysfunction.

Imaging reveals a destructive metastatic lesion at L3 causing mechanical collapse and severe canal stenosis. Operative decompression and stabilization are planned. What is the most critical preoperative step?

Explanation

Renal cell carcinoma metastases to the spine are highly vascular. Preoperative selective arterial embolization is strongly recommended to minimize life-threatening intraoperative blood loss.

Question 54

A 60-year-old patient undergoes a posterior cervical laminectomy and instrumented fusion from C3 to C6 for severe cervical myelopathy. On postoperative day 2, he develops profound new-onset weakness in his bilateral deltoids and biceps, with preserved strength elsewhere. Sensation is intact. What is the most likely etiology?

Explanation

C5 palsy is a well-known complication following posterior cervical decompression, presenting typically as deltoid and biceps weakness. It is thought to be caused by posterior shift of the spinal cord leading to traction on the short, horizontally oriented C5 nerve roots.

Question 55

A 45-year-old obese male undergoes a complex T10-Pelvis posterior spinal fusion. Postoperatively, he complains of painless, profound bilateral vision loss. Examination reveals sluggish pupillary responses and optic disc swelling. Which of the following risk factors is most strongly associated with this complication?

Explanation

Postoperative visual loss (POVL), specifically ischemic optic neuropathy (ION), is associated with prolonged prone positioning, large intraoperative blood loss, and prolonged hypotension. These factors lead to decreased venous return and subsequent optic nerve ischemia.

Question 56

A 30-year-old female sustains a Levine-Edwards Type IIa Hangman's fracture. Radiographs demonstrate an angulated C2 pars fracture with minimal translation. What treatment modality is strictly contraindicated in this specific injury pattern?

Explanation

A Type IIa Hangman's fracture is caused by flexion-distraction and features severe angulation with minimal translation. Axial traction is strictly contraindicated as it can cause over-distraction and severe neurologic injury.

Question 57

Which of the following congenital spinal anomalies carries the highest risk of rapid curve progression and invariably requires early surgical intervention?

Explanation

A unilateral unsegmented bar with a contralateral hemivertebra at the same level creates a severe growth imbalance. This specific anomaly has the highest risk of rapid, unrelenting curve progression and mandates early surgical arthrodesis.

Question 58

A 50-year-old diabetic male presents with severe unremitting back pain. MRI shows findings consistent with L4-L5 discitis and osteomyelitis. He is neurologically intact, hemodynamically stable, and blood cultures are negative. What is the most appropriate next step in management?

Explanation

In a stable, neurologically intact patient with suspected spondylodiscitis and negative blood cultures, a tissue diagnosis should be obtained via CT-guided biopsy before initiating antibiotics. Early empiric antibiotics can result in culture-negative biopsies, severely hindering targeted therapy.

Question 59

A 70-year-old male with long-standing ankylosing spondylitis presents to the emergency department with neck pain after a ground-level fall. Neurologic exam is intact. CT scan reveals a transverse fracture through the C5-C6 disc space. What is the most dreaded immediate complication that must be monitored for in this patient?

Explanation

Patients with ankylosing spondylitis who sustain a fracture are at very high risk for epidural hematoma due to the highly vascular nature of the fracture and altered epidural space. They also have high rates of secondary neurologic deterioration due to instability.

Question 60

A 42-year-old female presents with neck pain radiating down her left arm. Physical examination reveals a diminished brachioradialis reflex, decreased sensation over her left thumb and index finger, and weakness in wrist extension. Which cervical nerve root is most likely affected?

Explanation

The C6 nerve root innervates the brachioradialis and wrist extensors (ECRL, ECRB). A C6 radiculopathy typically presents with a diminished brachioradialis reflex and sensory changes in the thumb and index finger.

Question 61

A 35-year-old male falls from a ladder and sustains an L1 burst fracture. He is neurologically intact. MRI confirms the posterior ligamentous complex (PLC) is completely intact. According to the Thoracolumbar Injury Classification and Severity (TLICS) score, what is the best initial management?

Explanation

The TLICS score for this patient is 2 (Morphology: Burst = 2, Neuro: Intact = 0, PLC: Intact = 0). A score of 3 or less indicates non-operative management, making a TLSO brace the most appropriate choice.

Question 62

During a complex anterior thoracolumbar reconstruction, the surgeon must be mindful of the Artery of Adamkiewicz. Which of the following best describes the typical origin and function of this critical vessel?

Explanation

The Artery of Adamkiewicz (great anterior radiculomedullary artery) typically arises on the left side between T8 and L1. It is the major blood supply to the anterior spinal artery in the lower thoracic and lumbar spine.

Question 63

A 22-year-old male requires the placement of a halo vest for a complex upper cervical spine injury.

Where is the correct anatomical "safe zone" for the placement of the anterior halo pins in an adult?

Explanation

The anterior pins for a halo vest should be placed in the safe zone: 1 cm superior to the lateral third of the eyebrow (orbital rim). This avoids the supraorbital and supratrochlear nerves medially, and the temporalis muscle laterally.

Question 64

A 45-year-old man presents with severe lower back pain and right leg pain. An MRI reveals a far lateral (extraforaminal) disc herniation at the L4-L5 level. Which nerve root is most likely compressed, and what clinical finding would be expected?

Explanation

A far lateral (extraforaminal) disc herniation at L4-L5 compresses the exiting L4 nerve root, unlike paracentral herniations which compress the traversing L5 root. L4 compression classically presents with quadriceps weakness and a diminished patellar reflex.

Question 65

An 82-year-old woman sustains a Type II odontoid fracture after a ground-level fall. Which of the following is considered a significant risk factor for nonunion if treated conservatively with a hard cervical collar?

Explanation

Risk factors for nonunion in Type II odontoid fractures include patient age >50 years, initial displacement >5 mm, posterior displacement, and significant comminution.

Question 66

A 50-year-old male presents with radiating neck pain into his left arm. Physical examination demonstrates weakness in wrist flexion, finger extension, and triceps extension, along with an absent triceps reflex. Which cervical nerve root is most likely affected?

Explanation

The C7 nerve root provides innervation to the triceps, wrist flexors, and finger extensors. Compression at the C6-C7 level results in a C7 radiculopathy, characterized by an absent or diminished triceps reflex.

Question 67

In the surgical planning for an adult patient with severe sagittal imbalance, achieving proper spinopelvic parameters is critical to postoperative clinical success. What is the universally accepted target for the mismatch between Pelvic Incidence (PI) and Lumbar Lordosis (LL)?

Explanation

In adult spinal deformity correction, restoring global sagittal balance correlates with improved clinical outcomes. The ideal postoperative target is a Pelvic Incidence to Lumbar Lordosis (PI-LL) mismatch of less than 10 degrees.

Question 68

A 70-year-old man with pre-existing cervical spondylosis sustains a hyperextension injury to his neck. He presents with severe motor weakness in his hands and arms, but is able to move his legs with only mild weakness. What is the typical long-term prognosis for this specific spinal cord injury syndrome?

Explanation

Central cord syndrome classically presents with disproportionate upper extremity weakness. Prognosis for ambulation is generally good (over 50%), but recovery of fine motor function in the hands remains poor.

Question 69

A 55-year-old diabetic male presents with acute, severe, localized back pain and a low-grade fever. He has a history of recent intravenous catheter placement. Neurological examination is currently normal. What is the most common causative organism if an MRI confirms a spinal epidural abscess?

Explanation

The classic triad of a spinal epidural abscess is back pain, fever, and neurologic deficit, though localized back pain is often the earliest sign. Staphylococcus aureus is by far the most common causative organism.

Question 70

During the evaluation of a 2-year-old child with congenital scoliosis, various vertebral anomalies are noted on plain radiographs. Which of the following structural anomalies carries the highest risk for rapid and severe curve progression?

Explanation

A unilateral unsegmented bar with a contralateral hemivertebra creates a massive growth mismatch (growth on one side, tethered on the other), leading to the highest risk of rapid curve progression requiring early surgical intervention.

Question 71

A 24-year-old male arrives at the trauma bay after a motorcycle accident with flaccid paralysis below the T4 level, absent reflexes, and hypotension. Which of the following clinical signs definitively indicates the resolution of the temporary physiological state known as spinal shock?

Explanation

Spinal shock is a temporary state of areflexia and flaccidity following acute spinal cord injury. Its clinical resolution is strictly defined by the return of the polysynaptic bulbocavernosus reflex, typically within 24 to 48 hours.

Question 72

A 60-year-old patient with known systemic malignancy presents with an isolated spinal metastasis causing mechanical back pain but no acute neurological deficits. Which of the following primary tumor types is highly radiosensitive, often making radiation therapy the primary treatment modality over excisional surgery?

Explanation

Hematopoietic tumors like multiple myeloma and lymphomas are highly radiosensitive. In the absence of gross mechanical instability or rapid neurological decline, they are typically managed primarily with radiation rather than aggressive surgical resection.

Question 73

A 35-year-old unrestrained passenger is involved in a motor vehicle collision. Radiographs demonstrate a unilateral facet dislocation in the cervical spine.

What is the primary mechanism of injury leading to this specific pathology?

Explanation

Unilateral facet dislocations are caused by a combination of flexion-distraction and rotational forces. On lateral radiographs, they typically present with less than 50% (often ~25%) anterior translation of the vertebral body.

Question 74

A 5-year-old is newly diagnosed with congenital scoliosis. Before contemplating any surgical intervention, which of the following imaging workups is strictly mandatory due to the high incidence of associated syndromic anomalies?

Explanation

Congenital scoliosis is strongly associated with VACTERL anomalies. Up to 30% of patients have genitourinary anomalies and 20-40% have intraspinal anomalies (e.g., tethered cord), making a renal ultrasound and MRI of the entire neural axis mandatory.

Question 75

A 58-year-old male undergoes a 10-hour posterior spinal fusion for complex adult deformity, complicated by 2.5 liters of blood loss. Postoperatively, he complains of painless, bilateral visual loss. What is the most common etiology of postoperative visual loss (POVL) in this setting?

Explanation

Ischemic optic neuropathy (ION) is the leading cause of postoperative visual loss after major spine surgery. Risk factors include prolonged prone positioning, massive blood loss, hypotension, and the use of a Wilson frame.

Question 76

A 19-year-old female presents after a high-speed collision where she was wearing only a lap seatbelt. Imaging reveals a Chance fracture of L1. What concomitant injury must be highly suspected and urgently ruled out?

Explanation

Chance fractures are flexion-distraction injuries commonly associated with lap seatbelt use. They carry a 40-50% incidence of concurrent intra-abdominal hollow viscus injuries (e.g., bowel perforations), which must be urgently evaluated.

Question 77

A 45-year-old male with long-standing Ankylosing Spondylitis (AS) reports new-onset neck pain after a minor trip-and-fall at home. Initial AP and lateral cervical radiographs are read as "normal with expected syndesmophytes." What is the most appropriate next step in management?

Explanation

Patients with Ankylosing Spondylitis have rigid, osteopenic spines highly susceptible to unstable fractures even from minor trauma. Advanced imaging (CT/MRI) of the entire spine is mandatory due to the high risk of occult, highly unstable fractures and epidural hematomas.

Question 78

A 6-year-old boy is brought to the ER with transient lower extremity weakness and paresthesia following a trampoline fall. Complete spine X-rays and CT scans are negative for fracture or subluxation. An MRI reveals central cord edema. What biomechanical factor best explains the occurrence of Spinal Cord Injury Without Radiographic Abnormality (SCIWORA) in this patient?

Explanation

SCIWORA is primarily seen in the pediatric population. It occurs because the inherent ligamentous elasticity and horizontal facet orientation of the child's spine allow significant transient deformation without permanent skeletal disruption, injuring the underlying cord.

Question 79

Which of the following demographic and clinical profiles is most characteristic of Ossification of the Posterior Longitudinal Ligament (OPLL)?

Explanation

Ossification of the posterior longitudinal ligament (OPLL) is most prevalent in East Asian populations (particularly Japanese). It typically presents in middle-aged to elderly males with progressive symptoms of cervical myelopathy.

Master Orthopedic Spine Cases: Sharpen Your Diagnostic Skills

Orthopedic Spine Review | Dr Hutaif Spine Surgery Revie -...

Key Takeaway

Orthopedic Spine Review | Dr Hutaif Spine Surgery Revie -...

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