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Question 261

Topic: Cervical Spine

A 60-year-old Asian male presents with progressive cervical myelopathy. Imaging demonstrates continuous multi-level ossification of the posterior longitudinal ligament (OPLL) from C3-C6. Cervical lordosis is preserved, and the K-line is positive. Which procedure provides adequate decompression while minimizing the risk of a dural tear?

. C3-C6 laminoplasty
. C3-C6 anterior cervical corpectomy
. Translaminar excision of the ossified mass
. C1-C2 posterior instrumented fusion
. C5-C6 anterior cervical discectomy and fusion

Correct Answer & Explanation

. C3-C6 laminoplasty


Explanation

Laminoplasty is an excellent option for multi-level OPLL with preserved lordosis and a positive K-line. It expands the canal posteriorly, avoiding the high risk of dural tears associated with anterior resection of ossified dura.

Question 262

Topic: Cervical Spine

A 64-year-old man has severe cervical spondylotic myelopathy due to continuous ossification of the posterior longitudinal ligament (OPLL) from C3 to C6. He has a neutral cervical alignment. Which of the following is the most appropriate surgical approach to decompress the spinal cord?

. Multilevel anterior cervical discectomy and fusion (ACDF)
. Posterior cervical laminectomy and fusion
. Anterior cervical corpectomy of C4 and C5
. Posterior cervical foraminotomies
. Cervical disc arthroplasty at C3-C6

Correct Answer & Explanation

. Multilevel anterior cervical discectomy and fusion (ACDF)


Explanation

In patients with continuous OPLL spanning more than three levels and neutral or lordotic alignment, a posterior decompression (laminectomy and fusion or laminoplasty) is typically preferred. Extensive anterior surgery for OPLL carries a high risk of dural tears and morbidity.

Question 263

Topic: Cervical Spine

A 50-year-old man of East Asian descent presents with progressive hand clumsiness and broad-based gait. CT demonstrates a continuous, dense bony mass along the posterior aspect of the C3 to C6 vertebral bodies. MRI shows significant anterior spinal cord compression, but sagittal alignment is lordotic. What is the most appropriate surgical option?

. Laminectomy without instrumented fusion
. Anterior cervical corpectomies and fusion
. Posterior cervical laminoplasty
. Multi-level anterior cervical discectomy and fusion (ACDF)
. Continuous cervical traction and observation

Correct Answer & Explanation

. Laminectomy without instrumented fusion


Explanation

The presentation is classic for multi-level Ossification of the Posterior Longitudinal Ligament (OPLL). For multi-level OPLL with maintained cervical lordosis, a posterior approach (laminoplasty or laminectomy with fusion) is preferred to avoid the high risk of dural tears and massive bleeding associated with anterior resection of the ossified mass.

Question 264

Topic: Cervical Spine

An 82-year-old woman falls from a standing height. CT imaging reveals a Type II odontoid fracture with 2 mm of posterior displacement. She has no neurologic deficits but has a history of congestive heart failure and severe COPD. What is the most appropriate management?

. Halo vest immobilization
. Rigid cervical collar
. Anterior odontoid screw fixation
. Posterior C1-C2 fusion
. Occipitocervical fusion

Correct Answer & Explanation

. Halo vest immobilization


Explanation

In elderly patients with Type II odontoid fractures and significant medical comorbidities, rigid cervical collar immobilization is generally preferred. Both surgical intervention and halo vest immobilization carry disproportionately high morbidity and mortality in this specific patient population.

Question 265

Topic: Cervical Spine

A 30-year-old man dives into a shallow pool and sustains a burst fracture of C1 (Jefferson fracture). On the open-mouth odontoid radiograph, the sum of the lateral mass displacement of C1 over C2 is measured at 8 mm. What does this finding indicate?

. Intact transverse ligament
. Ruptured transverse ligament
. Ruptured alar ligament
. Associated Type II odontoid fracture
. Atlanto-occipital dissociation

Correct Answer & Explanation

. Intact transverse ligament


Explanation

According to Spence's rule, a combined lateral mass overhang of C1 on C2 greater than 6.9 mm on an AP radiograph strongly suggests a rupture of the transverse ligament. This renders the C1 ring fracture highly unstable.

Question 266

Topic: Cervical Spine

An 82-year-old man presents with neck pain after a ground-level fall. CT scan reveals a Type II odontoid fracture with 2 mm of posterior displacement. He has a history of severe COPD, ischemic heart disease, and osteoporosis. Neurologic examination is completely normal. What is the most appropriate initial management?

. Application of a halo vest orthosis
. Rigid cervical collar immobilization
. Anterior odontoid screw fixation
. Posterior C1-C2 instrumental fusion
. Occipitocervical fusion

Correct Answer & Explanation

. Application of a halo vest orthosis


Explanation

In elderly patients with severe comorbidities, isolated Type II odontoid fractures are typically managed with a rigid cervical collar. Surgical intervention and halo vests carry a prohibitively high morbidity and mortality risk in this demographic, making fibrous nonunion an acceptable outcome.

Question 267

Topic: Cervical Spine

A 32-year-old man is involved in a motor vehicle accident. He complains of right-sided arm pain and exhibits weakness in elbow flexion and wrist extension. Radiographs demonstrate an anterolisthesis of C5 on C6 of approximately 25%. What is the most likely diagnosis?

. Bilateral facet dislocation
. Unilateral facet dislocation
. Hangman's fracture
. Flexion teardrop fracture
. Clay shoveler's fracture

Correct Answer & Explanation

. Bilateral facet dislocation


Explanation

An anterolisthesis of approximately 25% (less than 50%) of the vertebral body width is classically associated with a unilateral facet dislocation. Bilateral facet dislocations typically present with greater than 50% displacement.

Question 268

Topic: Cervical Spine

Which of the following radiographic measurements on a lateral cervical spine film is most indicative of an atlanto-occipital dissociation?

. Basion-dental interval (BDI) > 12 mm
. Atlanto-dens interval (ADI) > 3 mm in an adult
. Prevertebral soft tissue swelling > 7 mm at C2
. Power's ratio < 1
. Cervical lordosis measuring less than 10 degrees

Correct Answer & Explanation

. Basion-dental interval (BDI) > 12 mm


Explanation

A Basion-Dental Interval (BDI) greater than 12 mm on plain radiographs or CT is highly suggestive of atlanto-occipital dissociation. An ADI > 3 mm suggests transverse ligament injury, not occipitocervical dissociation.

Question 269

Topic: Cervical Spine

An 82-year-old male presents with severe neck pain following a ground-level fall. CT of the cervical spine reveals a Type II odontoid fracture with 2 mm of posterior displacement. He is neurologically intact but has multiple medical comorbidities, including severe COPD and congestive heart failure. What is the most appropriate initial management?

. Rigid cervical collar
. Halo vest immobilization
. Anterior odontoid screw fixation
. Posterior C1-C2 instrumented fusion
. Transoral odontoidectomy

Correct Answer & Explanation

. Rigid cervical collar


Explanation

In elderly patients (typically >80 years) with multiple medical comorbidities, rigid cervical collar immobilization is the preferred initial treatment for Type II odontoid fractures. Surgery and halo vest immobilization carry exceptionally high morbidity and mortality in this specific patient population.

Question 270

Topic: Cervical Spine

An 82-year-old male with severe COPD and ischemic heart disease falls from a standing height. Imaging reveals a Type II odontoid fracture with 2 mm of posterior displacement. He is neurologically intact. What is the most appropriate management for this patient?

. Halo vest immobilization
. Rigid cervical collar
. Anterior odontoid screw fixation
. Posterior C1-C2 instrumented fusion
. Occipitocervical fusion

Correct Answer & Explanation

. Halo vest immobilization


Explanation

In frail elderly patients with significant medical comorbidities, rigid cervical collar immobilization is the preferred treatment for Type II odontoid fractures. Surgery and halo vest immobilization both carry prohibitively high morbidity and mortality rates in this specific population, and nonunions are frequently asymptomatic and stable.

Question 271

Topic: Cervical Spine

A 28-year-old female sustains a burst fracture of the C1 ring (Jefferson fracture) after a shallow water diving accident. An AP open-mouth odontoid radiograph reveals lateral displacement of the C1 lateral masses relative to the C2 articular facets. According to the Rule of Spence, a combined overhang greater than what value strongly suggests a transverse ligament rupture?

. 2.1 mm
. 4.5 mm
. 6.9 mm
. 8.2 mm
. 10.5 mm

Correct Answer & Explanation

. 2.1 mm


Explanation

The Rule of Spence dictates that a combined lateral overhang of the C1 lateral masses on C2 of > 6.9 mm on an AP open-mouth radiograph indicates a rupture of the transverse ligament. This implies a highly unstable injury pattern that often requires surgical stabilization.

Question 272

Topic: Cervical Spine

An 82-year-old man falls from standing and sustains a Type II odontoid fracture with 3 mm of posterior displacement. His neurologic examination is completely normal. What is the most appropriate management?

. Halo vest immobilization for 12 weeks
. Hard cervical collar for 6-12 weeks
. Anterior odontoid screw fixation
. Posterior C1-C2 transarticular screw fixation
. Posterior C1-C2 wiring without fusion

Correct Answer & Explanation

. Halo vest immobilization for 12 weeks


Explanation

In elderly patients (typically >80 years) with Type II odontoid fractures, rigid collar immobilization is generally preferred. This avoids the high morbidity and mortality associated with both halo vest application and operative intervention in this age group, despite inherently lower union rates.

Question 273

Topic: Cervical Spine

A 22-year-old diver hits his head on the bottom of a pool. Radiographs reveal a burst fracture of the C1 ring (Jefferson fracture). An open-mouth odontoid view shows an asymmetric overhang of the C1 lateral masses on C2 totaling 8 mm. This finding indicates disruption of which critical stabilizing structure?

. Apical ligament
. Alar ligament
. Transverse ligament
. Tectorial membrane
. Posterior longitudinal ligament

Correct Answer & Explanation

. Apical ligament


Explanation

The Rule of Spence dictates that a combined overhang of the C1 lateral masses on C2 of greater than 6.9 mm on an AP open-mouth radiograph implies disruption of the transverse ligament, rendering the C1 ring fracture highly unstable.

Question 274

Topic: Cervical Spine

Which of the following surgical factors is considered the strongest independent risk factor for the development of adjacent segment disease requiring surgery after an anterior cervical discectomy and fusion (ACDF)?

. Smoking
. Diabetes mellitus
. Plating within 5 mm of the adjacent unfused disc space
. Use of allograft instead of autograft
. Multilevel fusion

Correct Answer & Explanation

. Smoking


Explanation

Placement of an anterior cervical plate less than 5 mm from the adjacent unfused disc space significantly increases the risk of adjacent segment ossification and subsequent adjacent segment disease.

Question 275

Topic: Cervical Spine

A 35-year-old male is brought to the trauma bay after a high-speed motor vehicle collision. He is awake, alert, and cooperative. Imaging reveals a bilateral cervical facet dislocation at C5-C6. Neurologic exam reveals 3/5 strength in the bilateral upper extremities and intact sensation. According to current guidelines, what is the most appropriate immediate step in management?

. Obtain an urgent MRI of the cervical spine
. Immediate closed reduction with cranial traction
. Urgent anterior cervical discectomy and fusion (ACDF)
. Urgent posterior cervical instrumented fusion

Correct Answer & Explanation

. Obtain an urgent MRI of the cervical spine


Explanation

In an awake, alert, and cooperative patient with a cervical facet dislocation and a neurologic deficit, immediate closed reduction with cranial traction is indicated prior to obtaining an MRI. MRI is indicated if the patient cannot cooperate, fails closed reduction, or deteriorates neurologically.

Question 276

Topic: Cervical Spine

An 84-year-old female with multiple medical comorbidities sustains a Type II odontoid fracture with 3 mm of posterior displacement following a low-energy fall. She is neurologically intact. What is the most appropriate initial management?

. Halo vest immobilization
. Rigid cervical orthosis
. Anterior odontoid screw fixation
. Posterior C1-C2 instrumented fusion

Correct Answer & Explanation

. Halo vest immobilization


Explanation

In frail, elderly patients with Type II odontoid fractures, there is an unacceptably high morbidity and mortality associated with both halo vest application and surgical intervention. A rigid cervical orthosis is the preferred initial treatment for this demographic.

Question 277

Topic: Cervical Spine

A 21-year-old collegiate baseball pitcher presents with chronic medial elbow pain that is worse during the late cocking and early acceleration phases of throwing. MRI demonstrates a high-grade partial tear of the ulnar collateral ligament (UCL). He has failed 4 months of conservative management and is opting for reconstruction. Which specific structure provides the primary restraint to valgus stress at the elbow between 30 and 120 degrees of flexion?

. Posterior bundle of the UCL
. Radial collateral ligament
. Anterior bundle of the UCL
. Flexor-pronator mass
. Transverse ligament (Cooper's ligament)

Correct Answer & Explanation

. Posterior bundle of the UCL


Explanation

The anterior bundle of the ulnar collateral ligament (UCL) is the primary static stabilizer to valgus stress at the elbow, particularly functioning between 30 and 120 degrees of flexion. It originates on the anteroinferior surface of the medial epicondyle and inserts on the sublime tubercle of the ulna. The posterior bundle is a secondary restraint that is tightest in full flexion. The flexor-pronator mass provides secondary dynamic stability to valgus stress.

Question 278

Topic: Cervical Spine

The 'SAFE' interval in anterior cervical discectomy and fusion (ACDF) refers to the safe surgical corridor between which two anatomical structures?

. Carotid artery and jugular vein
. Trachea and esophagus
. Recurrent laryngeal nerve and longus colli muscle
. Prevertebral fascia and carotid sheath
. Common carotid artery and thyroid gland

Correct Answer & Explanation

. Carotid artery and jugular vein


Explanation

The 'SAFE' (Superior, Anterior, Fascial, Esophageal) interval or 'danger zone' in ACDF refers to the space between the carotid sheath (containing the carotid artery, jugular vein, vagus nerve) laterally and the esophagus/trachea medially, anterior to the prevertebral fascia. This corridor allows access to the cervical spine while minimizing injury to vital structures. The recurrent laryngeal nerve is within the tracheoesophageal groove, and careful retraction is needed to protect it.

Question 279

Topic: Cervical Spine

A 45-year-old woman undergoes an anterior cervical discectomy and fusion (ACDF) at C5-C6. During the exposure, the surgeon dissects laterally along the uncinate process. Which of the following structures is at greatest risk of iatrogenic injury if lateral dissection extends excessively beyond the uncinate process at this level?

. Superior laryngeal nerve
. Recurrent laryngeal nerve
. Vertebral artery
. Internal jugular vein
. Sympathetic trunk

Correct Answer & Explanation

. Superior laryngeal nerve


Explanation

In the lower cervical spine, the uncinate process serves as a crucial anatomic landmark, forming the medial border of the transverse foramen. The vertebral artery courses through the transverse foramina typically from C6 to C1. Dissection extending lateral to the uncinate process places the vertebral artery at significant risk of iatrogenic injury.

Question 280

Topic: Cervical Spine

A 45-year-old woman undergoes an anterior cervical discectomy and fusion (ACDF) at the C6-C7 level via a right-sided transverse incision. Postoperatively, she is noted to have profound hoarseness. The affected nerve is more susceptible to injury on the right side compared to the left due to which of the following anatomical characteristics?

. It loops under the aortic arch on the right, creating a shorter tethered segment.
. It loops under the subclavian artery on the right and travels a more oblique, vulnerable course in the lower neck.
. It runs within the carotid sheath on the right but strictly medial to it on the left.
. It passes anterior to the longus colli muscle on the right, directly in the surgical field.
. It is an anomalous direct branch of the superior laryngeal nerve on the right side.

Correct Answer & Explanation

. It loops under the aortic arch on the right, creating a shorter tethered segment.


Explanation

The recurrent laryngeal nerve (RLN) is responsible for vocal cord motor function. On the left side, the RLN loops under the aortic arch and ascends vertically in the tracheoesophageal groove, keeping it relatively protected. On the right side, it loops under the right subclavian artery and courses much more obliquely across the lower neck to reach the tracheoesophageal groove. This oblique path makes the right RLN more susceptible to direct injury or traction injury during a right-sided approach to the lower cervical spine (e.g., C6-C7 or C7-T1).