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Question 1141

Topic: Shoulder & Hip Sports

Entrapment of the suprascapular nerve at the spinoglenoid notch, often due to a paralabral cyst, typically results in isolated weakness of which muscle?

. Supraspinatus
. Infraspinatus
. Teres minor
. Subscapularis
. Deltoid

Correct Answer & Explanation

. Supraspinatus


Explanation

The suprascapular nerve innervates the supraspinatus before passing through the spinoglenoid notch. Entrapment at the spinoglenoid notch therefore causes isolated denervation and weakness of the infraspinatus.

Question 1142

Topic: Shoulder & Hip Sports

The quadrilateral space of the shoulder transmits the axillary nerve and the posterior circumflex humeral artery.

Which muscle defines the superior boundary of this space?

. Teres major
. Teres minor
. Long head of the triceps
. Surgical neck of the humerus
. Subscapularis

Correct Answer & Explanation

. Teres major


Explanation

The quadrilateral space is bordered superiorly by the teres minor, inferiorly by the teres major, medially by the long head of the triceps, and laterally by the surgical neck of the humerus.

Question 1143

Topic: Shoulder & Hip Sports

The subscapularis muscle is a crucial dynamic anterior stabilizer of the glenohumeral joint. What is its primary bony footprint insertion site?

. Greater tuberosity
. Lesser tuberosity
. Bicipital groove
. Coracoid process
. Infraglenoid tubercle

Correct Answer & Explanation

. Greater tuberosity


Explanation

The subscapularis tendon inserts primarily onto the lesser tuberosity of the proximal humerus. It acts as the primary internal rotator of the shoulder and provides critical anterior joint stability.

Question 1144

Topic: Shoulder & Hip Sports

A 22-year-old collegiate volleyball player presents with isolated weakness in shoulder external rotation. Shoulder abduction and internal rotation are full strength. There is isolated atrophy of the infraspinatus fossa. Where is the most likely site of nerve compression?

. Suprascapular notch
. Quadrangular space
. Spinoglenoid notch
. Triangular interval
. Coracoid process

Correct Answer & Explanation

. Suprascapular notch


Explanation

Compression of the suprascapular nerve at the spinoglenoid notch selectively denervates the infraspinatus. Compression at the suprascapular notch would affect both the supraspinatus and infraspinatus.

Question 1145

Topic: Shoulder & Hip Sports

An elite overhead throwing athlete presents with isolated weakness in external rotation of the shoulder. Examination reveals atrophy of the infraspinatus but normal supraspinatus bulk. Which anatomical structure is most likely compressing the affected nerve?

. Transverse scapular ligament
. Spinoglenoid ligament
. Coracoacromial ligament
. Superior transverse scapular ligament
. Quadrilateral space

Correct Answer & Explanation

. Transverse scapular ligament


Explanation

The suprascapular nerve innervates the supraspinatus before passing under the spinoglenoid ligament to innervate the infraspinatus. Entrapment at the spinoglenoid notch causes isolated infraspinatus atrophy.

Question 1146

Topic: Shoulder & Hip Sports

A 22-year-old rugby player undergoes an open Latarjet procedure for recurrent anterior shoulder instability with 25% glenoid bone loss. Postoperatively, he presents with profound weakness in elbow flexion and decreased sensation over the lateral aspect of his forearm. Which nerve was most likely injured during the procedure?

. Axillary nerve
. Musculocutaneous nerve
. Suprascapular nerve
. Radial nerve
. Median nerve

Correct Answer & Explanation

. Axillary nerve


Explanation

The musculocutaneous nerve is at significant risk during the Latarjet procedure, particularly during medial retraction of the conjoined tendon. Injury results in biceps weakness and numbness in the lateral antebrachial cutaneous nerve distribution.

Question 1147

Topic: Shoulder & Hip Sports

A 25-year-old male presents with recurrent anterior shoulder dislocations. CT imaging reveals a 22% anterior glenoid bone defect and a large, engaging Hill-Sachs lesion. Which of the following is the most appropriate definitive surgical management?

. Arthroscopic isolated Bankart repair
. Arthroscopic Bankart repair with remplissage
. Open Latarjet procedure
. Open inferior capsular shift
. Putti-Platt procedure

Correct Answer & Explanation

. Arthroscopic isolated Bankart repair


Explanation

In the setting of critical anterior glenoid bone loss (>20%) combined with an engaging Hill-Sachs lesion, isolated soft tissue repairs have an unacceptably high failure rate. A bony augmentation procedure, such as the Latarjet, is the definitive standard of care.

Question 1148

Topic: Shoulder & Hip Sports

A 30-year-old competitive weightlifter reports vague, deep posterior shoulder pain and a painful clicking sensation during the eccentric phase of the bench press. Examination demonstrates a positive jerk test. What is the most likely pathological finding?

. Anterosuperior labral tear
. Reverse Bankart lesion
. Bony Bankart lesion
. SLAP II tear
. ALPSA lesion

Correct Answer & Explanation

. Anterosuperior labral tear


Explanation

A positive jerk test is a reliable indicator of posterior shoulder instability. The classic pathoanatomical lesion associated with posterior instability is a reverse Bankart lesion, defined as a detachment of the posterior labrum from the posterior glenoid rim.

Question 1149

Topic: Shoulder & Hip Sports

A 19-year-old female gymnast complains of bilateral shoulder pain and feeling like her shoulders 'slip out' when reaching overhead. She has a positive sulcus sign bilaterally and generalized ligamentous laxity. After 9 months of dedicated physical therapy, she remains symptomatic. What is the surgical treatment of choice?

. Thermal capsulorrhaphy
. Arthroscopic Bankart repair
. Open Latarjet procedure
. Arthroscopic inferior capsular shift
. Coracoclavicular ligament reconstruction

Correct Answer & Explanation

. Thermal capsulorrhaphy


Explanation

For multidirectional instability (MDI) that fails prolonged nonoperative management, an arthroscopic or open capsular shift is the procedure of choice. This effectively reduces the capsular redundancy and volume, establishing joint stability without the high complication rates of thermal procedures.

Question 1150

Topic: Shoulder & Hip Sports
A 28-year-old professional baseball pitcher presents with deep shoulder pain and decreased throwing velocity. O'Brien's active compression test is positive. An MRI arthrogram reveals a superior labral tear with detachment of the biceps anchor from the superior glenoid. What SLAP tear type is this, and what is the optimal management?
. Type I; arthroscopic debridement
. Type II; arthroscopic superior labrum repair
. Type III; open biceps tenodesis
. Type IV; excision of the bucket-handle tear
. Type V; Bankart repair with capsular shift

Correct Answer & Explanation

. Type II; arthroscopic superior labrum repair


Explanation

A Type II SLAP tear involves detachment of the superior labrum and the origin of the long head of the biceps tendon from the superior glenoid. In young overhead athletes, the standard initial surgical management is arthroscopic repair of the superior labrum.

Question 1151

Topic: Shoulder & Hip Sports

During an arthroscopic stabilization for recurrent anterior shoulder instability, you note that the labrum is completely intact, but the anterior band of the inferior glenohumeral ligament (IGHL) is avulsed off the humeral neck. What is the correct terminology for this specific lesion?

. ALPSA lesion
. GLAD lesion
. Perthes lesion
. HAGL lesion
. Reverse Bankart lesion

Correct Answer & Explanation

. ALPSA lesion


Explanation

Humeral Avulsion of the Glenohumeral Ligament (HAGL) represents a tear of the IGHL from its humeral attachment rather than the glenoid labrum. Failure to recognize and address this lesion is a well-documented cause of recurrent postoperative instability.

Question 1152

Topic: Shoulder & Hip Sports

During a Latarjet procedure for anterior shoulder instability, what is the anatomical landmark that dictates the maximum safe proximal osteotomy of the coracoid process to avoid destabilizing the clavicle and endangering the suprascapular nerve?

. The insertion of the pectoralis minor
. The conoid ligament
. The trapezoid ligament
. The coracoacromial ligament
. The base of the coracoid at the scapular notch

Correct Answer & Explanation

. The insertion of the pectoralis minor


Explanation

The coracoid osteotomy must be performed just distal to the coracoclavicular ligaments, specifically the conoid ligament, to prevent iatrogenic acromioclavicular instability. Remaining distal to the conoid also keeps the osteotomy well clear of the suprascapular notch and nerve.

Question 1153

Topic: Shoulder & Hip Sports

A 28-year-old rock climber with recurrent anterior shoulder dislocations is found to have an engaging Hill-Sachs lesion but minimal glenoid bone loss. An arthroscopic Bankart repair with 'remplissage' is planned. Which structure is tenodesed into the humeral defect during this adjunctive procedure?

. Subscapularis tendon
. Long head of the biceps tendon
. Infraspinatus tendon
. Teres minor tendon
. Supraspinatus tendon

Correct Answer & Explanation

. Subscapularis tendon


Explanation

The remplissage (French for 'filling') procedure involves converting an intra-articular Hill-Sachs lesion into an extra-articular defect by tenodesing the infraspinatus tendon and posterior capsule into the bony defect. This prevents the defect from engaging the anterior glenoid rim during external rotation.

Question 1154

Topic: Shoulder & Hip Sports

A 20-year-old rugby player presents with recurrent anterior shoulder instability. A 3D CT scan reveals 25% anterior glenoid bone loss. What is the most appropriate definitive surgical management?

. Arthroscopic Bankart repair with suture anchors
. Open inferior capsular shift
. Coracoid transfer (Latarjet procedure)
. Remplissage procedure alone
. Arthroscopic superior labral anterior to posterior (SLAP) repair

Correct Answer & Explanation

. Arthroscopic Bankart repair with suture anchors


Explanation

A Latarjet procedure is indicated for patients with recurrent anterior instability and greater than 20-25% glenoid bone loss. Soft tissue procedures alone, such as an arthroscopic Bankart repair, have an unacceptably high failure rate in this setting.

Question 1155

Topic: Shoulder & Hip Sports

During an arthroscopic anterior stabilization for recurrent shoulder instability, an off-track, engaging Hill-Sachs lesion is identified. Glenoid bone loss is measured at 8%. Which of the following is the most appropriate adjunctive procedure?

. Arthroscopic Bankart repair alone
. Coracoid transfer (Latarjet)
. Remplissage (infraspinatus tenodesis)
. Anterior glenoid structural bone grafting
. Subscapularis transfer (McLaughlin procedure)

Correct Answer & Explanation

. Arthroscopic Bankart repair alone


Explanation

The remplissage procedure (infraspinatus tenodesis into the defect) is indicated for engaging, off-track Hill-Sachs lesions when glenoid bone loss is subcritical (<15-20%). It effectively converts an intra-articular defect into an extra-articular one, preventing engagement over the anterior glenoid rim.

Question 1156

Topic: Shoulder & Hip Sports

A 21-year-old collegiate offensive lineman presents with vague posterior shoulder pain exacerbated by bench pressing. Examination reveals increased posterior translation with a load-and-shift test and pain with the jerk test. What is the initial treatment of choice?

. Open posterior capsular shift
. Arthroscopic posterior labral repair
. Rotator cuff strengthening focused on the subscapularis
. Physical therapy emphasizing posterior deltoid and periscapular stabilizers
. Posterior glenoid bone block augmentation

Correct Answer & Explanation

. Open posterior capsular shift


Explanation

The initial treatment for isolated, recurrent posterior shoulder instability, particularly in athletes without significant bone loss, is non-operative management. This focuses on physical therapy to strengthen the posterior shoulder musculature and periscapular stabilizers.

Question 1157

Topic: Shoulder & Hip Sports

A 26-year-old professional baseball pitcher reports a "dead arm" and deep shoulder pain during the late cocking phase of throwing. A type II SLAP tear is suspected. Which of the following pathomechanical processes is most responsible for this specific injury pattern?

. Tensile failure of the anterior capsule
. Internal impingement of the rotator cuff
. The peel-back mechanism of the biceps anchor
. Subcoracoid impingement
. Microinstability of the posterior band of the IGHL

Correct Answer & Explanation

. Tensile failure of the anterior capsule


Explanation

Type II SLAP tears in overhead throwing athletes are primarily caused by the peel-back mechanism. During the late cocking phase, maximal external rotation and abduction create a torsional force at the base of the biceps, causing the posterosuperior labrum to peel off the glenoid.

Question 1158

Topic: Shoulder & Hip Sports

A 30-year-old man continues to have anterior shoulder instability after a seemingly successful arthroscopic Bankart repair. A revision MRI arthrogram is obtained.

The imaging demonstrates contrast extending inferiorly into the axillary pouch with a characteristic "J-sign" at the humeral insertion of the capsule. What is the most likely diagnosis?

. ALPSA lesion
. GLAD lesion
. HAGL lesion
. Engaging Hill-Sachs lesion
. Reverse Bankart lesion

Correct Answer & Explanation

. ALPSA lesion


Explanation

A Humeral Avulsion of the Glenohumeral Ligament (HAGL) lesion involves the tearing of the inferior glenohumeral ligament from its humeral insertion. On MRI arthrography, this presents as the characteristic "J-sign" as contrast extends inferiorly into the axillary pouch through the defect.

Question 1159

Topic: Shoulder & Hip Sports

A 25-year-old male presents with recurrent anterior shoulder dislocations. A pre-operative CT scan demonstrates an anterior glenoid bone defect.

At what percentage of anterior glenoid bone loss is a Latarjet procedure or bone grafting generally indicated over an isolated arthroscopic Bankart repair?

. 5-10%
. 10-15%
. 20-25%
. 35-40%
. Greater than 50%

Correct Answer & Explanation

. 5-10%


Explanation

A critical glenoid bone loss of approximately 20-25% results in unacceptably high failure rates with soft-tissue Bankart repair alone. In these cases, a bony augmentation procedure such as a Latarjet is the recommended surgical management.

Question 1160

Topic: Shoulder & Hip Sports

A 35-year-old male with a history of a seizure disorder presents with an unrecognized locked posterior shoulder dislocation that occurred 3 weeks ago. CT imaging reveals an anteromedial humeral head defect (reverse Hill-Sachs lesion) involving 35% of the articular surface. The glenohumeral cartilage is otherwise preserved. What is the most appropriate surgical treatment?

. Closed reduction and spica cast application
. Arthroscopic posterior labral repair
. Subscapularis transfer (McLaughlin procedure) or lesser tuberosity transfer
. Total shoulder arthroplasty
. Latarjet procedure

Correct Answer & Explanation

. Closed reduction and spica cast application


Explanation

For a reverse Hill-Sachs lesion involving 20% to 40% of the articular surface, transferring the subscapularis tendon (McLaughlin) or the lesser tuberosity (modified McLaughlin) into the defect prevents engagement and restores stability. Defects greater than 40% typically require structural allograft or arthroplasty.