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Question 961

Topic: Shoulder & Hip Sports

A 30-year-old elite volleyball player complains of vague posterior shoulder pain and isolated weakness in external rotation. An MRI reveals a paralabral ganglion cyst. At what precise anatomic location is this cyst most likely compressing the affected nerve?

. Suprascapular notch
. Spinoglenoid notch
. Quadrilateral space
. Triangular interval
. Spiral groove

Correct Answer & Explanation

. Spinoglenoid notch


Explanation

The suprascapular nerve innervates the supraspinatus and infraspinatus. Compression at the spinoglenoid notch affects only the infraspinatus, causing isolated external rotation weakness.

Question 962

Topic: Shoulder & Hip Sports

A 22-year-old rugby player undergoes an open Latarjet procedure for recurrent anterior shoulder instability. Postoperatively, he presents with weakness in elbow flexion and forearm supination, as well as numbness over the lateral forearm. Which nerve was most likely injured during the procedure?

. Median nerve
. Axillary nerve
. Musculocutaneous nerve
. Radial nerve
. Ulnar nerve

Correct Answer & Explanation

. Musculocutaneous nerve


Explanation

The musculocutaneous nerve is at significant risk during the Latarjet procedure, particularly during coracoid osteotomy and transfer. It enters the coracobrachialis approximately 5 to 8 cm distal to the coracoid process.

Question 963

Topic: Shoulder & Hip Sports

A 22-year-old competitive rugby player with recurrent anterior shoulder instability is found to have 25% anterior glenoid bone loss on a 3D CT scan. Which of the following is the most appropriate surgical intervention?

. Arthroscopic Bankart repair
. Open Bankart repair with inferior capsular shift
. Latarjet procedure
. Remplissage procedure alone
. Arthroscopic SLAP repair

Correct Answer & Explanation

. Latarjet procedure


Explanation

Glenoid bone loss greater than 20-25% in the setting of recurrent anterior instability is an absolute indication for a bony augmentation procedure. The Latarjet procedure (coracoid transfer) is favored as it restores the bony arc and provides a soft-tissue sling via the conjoint tendon.

Question 964

Topic: Shoulder & Hip Sports

A 32-year-old patient reports progressively increasing pain and stiffness after undergoing arthroscopic shoulder stabilization 1 year ago. The stabilization procedure was a Bankart repair with anchor fixation and supplemented with the heat probe. Radiographs are shown in Figures 45a and 45b. What is the most likely diagnosis?

. Subscapularis failure
. Frozen shoulder
. Recurrent instability
. Loose body
. Chondrolysis

Correct Answer & Explanation

. Chondrolysis


Explanation

Postshoulder stabilization chondrolysis is a rare but devastating complication. It has been implicated with the use of the radiofrequency heat probe in some patients. Levine WN, Clark AM Jr, D'Alessandro DF, et al: Chondrolysis following arthroscopic thermal capsulorrhaphy to treat shoulder instability: A report of two cases. J Bone Joint Surg Am 2005;87:616-621.

Question 965

Topic: Shoulder & Hip Sports

A 22-year-old athlete sustains a traumatic anterior shoulder dislocation. During preoperative planning, an 'engaging' Hill-Sachs lesion is identified. Which of the following defines an engaging Hill-Sachs lesion?

. Defect parallel to the anterior glenoid rim with the arm in adduction
. Defect parallel to the anterior glenoid rim with the arm in abduction and external rotation
. Defect perpendicular to the glenoid rim in internal rotation
. Defect involving less than 10% of the humeral head
. Defect associated with a Bony Bankart lesion greater than 25%

Correct Answer & Explanation

. Defect parallel to the anterior glenoid rim with the arm in abduction and external rotation


Explanation

An 'engaging' Hill-Sachs lesion occurs when the orientation of the humeral head defect becomes parallel to the anterior glenoid rim when the shoulder is positioned in abduction and external rotation, allowing the defect to lever out and cause dislocation.

Question 966

Topic: Shoulder & Hip Sports

A 72-year-old male presents with profound weakness in external rotation and abduction three weeks after successful closed reduction of an anterior shoulder dislocation. Electromyography reveals normal axillary nerve function. What is the most likely diagnosis?

. Brachial plexus traction injury
. Chronic anterior instability
. Massive rotator cuff tear
. Suprascapular nerve palsy
. Deltoid avulsion

Correct Answer & Explanation

. Massive rotator cuff tear


Explanation

Elderly patients with anterior shoulder dislocations have a very high incidence of concomitant rotator cuff tears (up to 80% in patients > 60 years old). Persistent weakness despite a normal axillary nerve strongly suggests a massive cuff tear.

Question 967

Topic: Shoulder & Hip Sports

A 45-year-old male construction worker presents with persistent anterior shoulder pain. He had a prior SLAP repair 20 years ago. An MRI demonstrates a failed Type II SLAP repair and advanced biceps tendinopathy. What is the most appropriate surgical treatment?

. Revision arthroscopic SLAP repair
. Arthroscopic superior labral debridement only
. Biceps tenodesis
. Subacromial decompression without biceps management
. Coracoid transfer (Latarjet procedure)

Correct Answer & Explanation

. Biceps tenodesis


Explanation

In patients older than 40 years, biceps tenodesis has been shown to have significantly lower failure rates and higher patient satisfaction compared to primary or revision SLAP repair. Revision SLAP repair in this age group has a high rate of continued pain and stiffness.

Question 968

Topic: Shoulder & Hip Sports

A 22-year-old rugby player with recurrent anterior shoulder instability and 25% glenoid bone loss undergoes a Latarjet procedure. During the coracoid transfer, the musculocutaneous nerve must be identified and protected. What is its approximate distance from the tip of the coracoid process?

. 1 to 2 cm
. 3 to 8 cm
. 10 to 12 cm
. 14 to 16 cm
. 18 to 20 cm

Correct Answer & Explanation

. 3 to 8 cm


Explanation

The musculocutaneous nerve typically enters the coracobrachialis muscle 3 to 8 cm (average ~5 cm) distal to the tip of the coracoid process. This places it at significant risk during coracoid osteotomy and transfer if dissection is carried too far distally.

Question 969

Topic: Shoulder & Hip Sports

A 26-year-old elite volleyball attacker complains of chronic posterior shoulder pain and isolated weakness in external rotation. Forward elevation and internal rotation are full and 5/5 in strength. MRI reveals a paralabral cyst. At which anatomic location is the nerve compression most likely occurring?

. Suprascapular notch
. Quadrilateral space
. Spinoglenoid notch
. Spiral groove
. Triangular space

Correct Answer & Explanation

. Spinoglenoid notch


Explanation

Isolated weakness of external rotation (infraspinatus) with preserved abduction (supraspinatus) points to compression of the suprascapular nerve at the spinoglenoid notch. Compression at the more proximal suprascapular notch would affect both the supraspinatus and infraspinatus.

Question 970

Topic: Shoulder & Hip Sports

A 21-year-old collegiate baseball pitcher presents with anterior shoulder pain. Physical examination of his throwing shoulder reveals 25 degrees less internal rotation compared to his non-throwing shoulder, but his total arc of motion is symmetric. What is the primary underlying anatomic pathology associated with this condition?

. Contracture of the anteroinferior capsule
. Contracture of the posteroinferior capsule
. Subscapularis tear
. SLAP tear
. Infraspinatus atrophy

Correct Answer & Explanation

. Contracture of the posteroinferior capsule


Explanation

Glenohumeral internal rotation deficit (GIRD) is characterized by a loss of internal rotation in the throwing shoulder. It is primarily driven by a contracture and thickening of the posteroinferior capsule.

Question 971

Topic: Shoulder & Hip Sports

A 30-year-old volleyball player presents with vague posterior shoulder pain and weakness in external rotation. MRI reveals a paralabral cyst compressing the nerve at the spinoglenoid notch. Which muscle(s) will most likely demonstrate denervation changes on electromyography (EMG)?

. Supraspinatus only
. Infraspinatus only
. Both supraspinatus and infraspinatus
. Teres minor only
. Deltoid and teres minor

Correct Answer & Explanation

. Infraspinatus only


Explanation

Compression of the suprascapular nerve at the spinoglenoid notch occurs distal to the motor branches innervating the supraspinatus. Therefore, it results in isolated weakness and denervation of the infraspinatus muscle.

Question 972

Topic: Shoulder & Hip Sports

A 28-year-old male volleyball player presents with insidious onset of right shoulder weakness. Examination reveals isolated weakness in external rotation with the arm at the side, but normal forward elevation and internal rotation. MRI shows a paralabral cyst at the spinoglenoid notch. Which of the following labral pathologies is most commonly associated with this finding?

. Anterior Bankart lesion
. Posterior superior labral tear
. ALPSA lesion
. Type II SLAP tear
. Kim lesion

Correct Answer & Explanation

. Posterior superior labral tear


Explanation

A paralabral cyst at the spinoglenoid notch typically causes isolated compression of the suprascapular nerve as it innervates the infraspinatus, leading to isolated external rotation weakness. These cysts are most frequently associated with posterior or posterosuperior labral tears, where synovial fluid acts as a one-way valve to form the cyst.

Question 973

Topic: Shoulder & Hip Sports

A 35-year-old man presents to the emergency department after a first-time generalized seizure. Radiographs demonstrate a posterior shoulder dislocation with an anteromedial humeral head defect (reverse Hill-Sachs lesion) involving 25% of the articular surface. The shoulder is unstable in internal rotation after closed reduction. What is the most appropriate surgical management?

. Arthroscopic posterior Bankart repair
. Open posterior capsular shift
. Transfer of the lesser tuberosity into the defect
. Total shoulder arthroplasty
. Closed reduction and spica cast immobilization

Correct Answer & Explanation

. Transfer of the lesser tuberosity into the defect


Explanation

For reverse Hill-Sachs lesions involving 20% to 40% of the articular surface, transferring the lesser tuberosity with the subscapularis tendon into the defect (modified McLaughlin procedure) is indicated. This prevents the defect from engaging the posterior glenoid rim during internal rotation.

Question 974

Topic: Shoulder & Hip Sports

A 40-year-old man presents with severe shoulder pain and limited external rotation after a seizure. Radiographs demonstrate a locked posterior shoulder dislocation with an anteromedial humeral head impression fracture (reverse Hill-Sachs lesion) involving 30% of the articular surface. What is the most appropriate surgical management?

. Closed reduction and shoulder spica casting
. Arthroscopic posterior Bankart repair
. Open reduction and transfer of the lesser tuberosity into the defect
. Humeral head hemiarthroplasty
. Total shoulder arthroplasty

Correct Answer & Explanation

. Open reduction and transfer of the lesser tuberosity into the defect


Explanation

For posterior shoulder dislocations with an anteromedial articular defect between 20% and 40%, the modified McLaughlin procedure (transfer of the lesser tuberosity/subscapularis into the defect) provides stability. Defects greater than 40% typically require arthroplasty.

Question 975

Topic: Shoulder & Hip Sports

A 38-year-old man presents with a locked posterior shoulder dislocation following a seizure. CT scan confirms an anteromedial humeral head defect (reverse Hill-Sachs lesion) involving 35% of the articular surface. What is the most appropriate surgical management?

. Closed reduction and sling
. Arthroscopic posterior labral repair
. Open reduction and subscapularis transfer (McLaughlin procedure)
. Shoulder hemiarthroplasty
. Latarjet procedure

Correct Answer & Explanation

. Open reduction and subscapularis transfer (McLaughlin procedure)


Explanation

For reverse Hill-Sachs defects between 20-40%, transfer of the subscapularis or lesser tuberosity into the defect is indicated. This modified McLaughlin procedure restores anterior stability and prevents engagement.

Question 976

Topic: Shoulder & Hip Sports

A 22-year-old collegiate rugby player presents with recurrent anterior shoulder instability. CT imaging demonstrates a 30% anterior glenoid bone defect. Which of the following is the most appropriate surgical management?

. Arthroscopic Bankart repair
. Open Bankart repair with inferior capsular shift
. Coracoid transfer (Latarjet procedure)
. Remplissage procedure alone
. Arthroscopic SLAP repair

Correct Answer & Explanation

. Coracoid transfer (Latarjet procedure)


Explanation

Critical glenoid bone loss (>20-25%) in a young collision athlete is a classic indication for a bony augmentation procedure, such as the Latarjet procedure, due to the unacceptably high failure rate of soft-tissue stabilization alone.

Question 977

Topic: Shoulder & Hip Sports

A 34-year-old male presents to the ER after a generalized tonic-clonic seizure. His shoulder is locked in internal rotation. A modified axillary radiograph reveals a posterior shoulder dislocation with an anteromedial humeral head defect involving 30% of the articular surface. Which procedure is most appropriate?

. Closed reduction and external rotation bracing
. Arthroscopic posterior capsulorrhaphy
. Transfer of the lesser tuberosity into the defect (Modified McLaughlin)
. Latarjet procedure
. Total shoulder arthroplasty

Correct Answer & Explanation

. Transfer of the lesser tuberosity into the defect (Modified McLaughlin)


Explanation

For a reverse Hill-Sachs lesion involving 20% to 40% of the articular surface associated with posterior instability, a modified McLaughlin procedure (transfer of the lesser tuberosity or subscapularis into the defect) is indicated to prevent engagement.

Question 978

Topic: Shoulder & Hip Sports

A 40-year-old male presents with an unprovoked seizure resulting in a right posterior shoulder dislocation. Imaging reveals an anteromedial humeral head defect (reverse Hill-Sachs lesion) involving 30% of the articular surface. What is the most appropriate surgical management to prevent recurrent instability?

. Arthroscopic posterior Bankart repair alone
. Latarjet procedure
. Transfer of the lesser tuberosity or subscapularis into the defect
. Open reduction and internal fixation of the humeral head defect
. Anatomic total shoulder arthroplasty

Correct Answer & Explanation

. Transfer of the lesser tuberosity or subscapularis into the defect


Explanation

For a reverse Hill-Sachs lesion involving 20% to 40% of the articular surface, filling the defect via transfer of the lesser tuberosity or subscapularis tendon (McLaughlin or modified McLaughlin procedure) is the recommended treatment to prevent engagement.

Question 979

Topic: Shoulder & Hip Sports

A 22-year-old collegiate rugby player presents with recurrent anterior shoulder instability. An MRI reveals a 25% bony Bankart lesion of the anterior glenoid.

Which of the following surgical interventions provides the most reliable long-term stability for this patient?

. Arthroscopic labral repair with suture anchors
. Open Bankart repair with capsular shift
. Latarjet procedure
. Arthroscopic remplissage
. Putti-Platt procedure

Correct Answer & Explanation

. Latarjet procedure


Explanation

The Latarjet procedure is indicated for patients with recurrent anterior shoulder instability and significant glenoid bone loss (>20-25%). Soft tissue repairs alone in this setting have an unacceptably high failure rate.

Question 980

Topic: Shoulder & Hip Sports

A 22-year-old collegiate rugby player presents with recurrent anterior shoulder instability after a primary traumatic dislocation. A 3D-CT scan reveals 25% anterior glenoid bone loss. What is the most appropriate definitive surgical management?

. Arthroscopic Bankart repair with capsulolabral shift
. Open Latarjet procedure
. Arthroscopic remplissage
. Open Bankart repair
. Putti-Platt procedure

Correct Answer & Explanation

. Open Latarjet procedure


Explanation

Glenoid bone loss exceeding 20-25% is a classic contraindication for isolated soft tissue repair (Bankart). The Latarjet procedure (coracoid transfer) is the standard of care to restore anterior stability in contact athletes with critical bone loss.