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Question 321

Topic: Shoulder & Hip Sports

During arthroscopic stabilization for recurrent anterior shoulder instability, the surgeon identifies an ALPSA lesion. Which of the following best describes the anatomic pathomorphology of this specific lesion?

. Avulsion of the glenohumeral ligament directly from its humeral attachment
. The anterior labrum is avulsed and displaced medially and inferiorly along the glenoid neck
. A superior labral tear that extends from anterior to posterior
. A non-detached cartilage flap tear of the anterior inferior glenoid
. A bony avulsion of the anterior-inferior glenoid rim

Correct Answer & Explanation

. The anterior labrum is avulsed and displaced medially and inferiorly along the glenoid neck


Explanation

An ALPSA (Anterior Labroligamentous Periosteal Sleeve Avulsion) lesion occurs when the anterior labrum and periosteum are stripped and displaced medially down the anterior glenoid neck. It differs from a classic Bankart lesion, where the labrum is detached but remains roughly in its anatomic position.

Question 322

Topic: Shoulder & Hip Sports

A surgeon plans an arthroscopic Bankart repair with Remplissage for a patient with 10% anterior glenoid bone loss and an "off-track" Hill-Sachs lesion. Which structure is tenodesed into the humeral head defect during the Remplissage portion of the procedure?

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

Correct Answer & Explanation

. Infraspinatus tendon


Explanation

The Remplissage procedure (French for "to fill in") involves capsulotenodesis of the posterior capsule and the infraspinatus tendon into the posterior/posterolateral humeral head defect (Hill-Sachs lesion) to prevent it from engaging the anterior glenoid.

Question 323

Topic: Shoulder & Hip Sports

A 19-year-old gymnast complains of bilateral shoulder pain and a sensation that her shoulders are "slipping out of place." Physical examination demonstrates generalized ligamentous laxity, a positive sulcus sign of 2.5 cm bilaterally, and apprehension with anterior and posterior translation. What is the most appropriate initial management?

. Arthroscopic anterior capsular plication
. Open inferior capsular shift
. Latarjet procedure
. Prolonged physical therapy focusing on scapular and rotator cuff strengthening
. Immobilization in external rotation for 4 weeks

Correct Answer & Explanation

. Prolonged physical therapy focusing on scapular and rotator cuff strengthening


Explanation

This patient has Multidirectional Instability (MDI). The cornerstone and most appropriate initial management for MDI is a dedicated physical therapy program focusing on dynamic stabilizers, specifically the rotator cuff and periscapular musculature.

Question 324

Topic: Shoulder & Hip Sports

A 24-year-old athlete with recurrent anterior shoulder instability undergoes an arthroscopic Bankart repair. Preoperative imaging demonstrated 10% glenoid bone loss and an 'off-track' Hill-Sachs lesion. Which of the following is the most appropriate concurrent procedure?

. Open Latarjet procedure
. Arthroscopic Remplissage
. Arthroscopic capsular shift
. Iliac crest bone grafting
. Proximal humerus derotational osteotomy

Correct Answer & Explanation

. Arthroscopic Remplissage


Explanation

An 'off-track' Hill-Sachs lesion with subcritical glenoid bone loss (<15-20%) is best managed with a Bankart repair and concurrent arthroscopic Remplissage (infraspinatus tenodesis) to prevent engagement. Latarjet is generally reserved for critical bone loss (>15-20%).

Question 325

Topic: Shoulder & Hip Sports

A 45-year-old male presents to the emergency department after a seizure. He complains of right shoulder pain and an inability to rotate the arm externally. Radiographs show a 'lightbulb' sign on the AP view. What is the most likely associated osseous defect?

. Posterolateral humeral head impaction fracture (Hill-Sachs)
. Anteromedial humeral head impaction fracture (Reverse Hill-Sachs)
. Anterior glenoid rim fracture (Bony Bankart)
. Greater tuberosity avulsion fracture
. Coracoid process fracture

Correct Answer & Explanation

. Anteromedial humeral head impaction fracture (Reverse Hill-Sachs)


Explanation

The patient has a posterior shoulder dislocation, commonly occurring after seizures or electrical shocks. It is frequently associated with an anteromedial humeral head impaction fracture, known as a reverse Hill-Sachs lesion.

Question 326

Topic: Shoulder & Hip Sports

A 38-year-old male suffers a posterior shoulder dislocation. Imaging reveals an anteromedial humeral head defect comprising 30% of the articular surface. Which of the following surgical interventions is most appropriate?

. Arthroscopic posterior labral repair
. Open reduction and transfer of the subscapularis tendon into the defect
. Open reduction and transfer of the infraspinatus tendon into the defect
. Coracoid transfer to the posterior glenoid
. Total shoulder arthroplasty

Correct Answer & Explanation

. Open reduction and transfer of the subscapularis tendon into the defect


Explanation

For reverse Hill-Sachs lesions involving 20-40% of the articular surface, a modified McLaughlin procedure is indicated. This involves the transfer of the subscapularis tendon and/or lesser tuberosity into the defect to prevent it from engaging the anterior glenoid rim.

Question 327

Topic: Shoulder & Hip Sports

A 16-year-old female swimmer presents with bilateral shoulder pain and a sensation of her shoulders 'slipping out' during her stroke. Physical exam shows a positive sulcus sign and generalized ligamentous laxity. After a 6-month trial of directed physical therapy, she remains highly symptomatic. Which surgical procedure is most indicated?

. Open Latarjet procedure
. Arthroscopic capsular plication and shift
. Remplissage
. Putti-Platt procedure
. Biceps tenodesis

Correct Answer & Explanation

. Arthroscopic capsular plication and shift


Explanation

The patient has Multidirectional Instability (MDI). When conservative management (PT focusing on periscapular stabilizers) fails, the surgical treatment of choice is an arthroscopic or open capsular plication/shift to reduce capsular volume and redundancy.

Question 328

Topic: Shoulder & Hip Sports

During an arthroscopic stabilization for anterior shoulder instability, the surgeon notes that the anterior labroligamentous complex is avulsed from the glenoid and has healed medially on the anterior neck of the scapula with an intact periosteal sleeve. This finding is best described as which of the following?

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

Correct Answer & Explanation

. ALPSA lesion


Explanation

An Anterior Labroligamentous Periosteal Sleeve Avulsion (ALPSA) lesion occurs when the torn labrum displaces medially and heals to the anterior scapular neck. It must be fully mobilized laterally during repair to restore normal anatomy, unlike a classic Bankart lesion where the periosteum ruptures.

Question 329

Topic: Shoulder & Hip Sports

A 19-year-old male recreational basketball player undergoes an arthroscopic Bankart repair for recurrent anterior shoulder instability. Which of the following factors is associated with the highest risk of recurrent instability following this procedure?

. Age younger than 20 years
. Presence of a SLAP tear
. Use of bioabsorbable anchors
. Delay to surgery > 6 weeks
. Greater tuberosity fracture

Correct Answer & Explanation

. Age younger than 20 years


Explanation

Young age (typically <20 or <22 years) and participation in competitive or contact sports are among the most significant independent risk factors for failure of isolated arthroscopic Bankart repairs.

Question 330

Topic: Shoulder & Hip Sports

The 'glenoid track' is a critical concept in evaluating shoulder instability. How is the width of the normal glenoid track calculated relative to the uninjured glenoid width (D)?

. 63% of D
. 75% of D
. 83% of D
. 90% of D
. 100% of D

Correct Answer & Explanation

. 83% of D


Explanation

The width of the normal glenoid track is calculated as 83% of the width of the intact glenoid (D). If there is anterior glenoid bone loss (d), the true glenoid track width becomes 0.83D - d. A Hill-Sachs lesion extending beyond this track is considered 'off-track'.

Question 331

Topic: Shoulder & Hip Sports

A 22-year-old overhead athlete presents with recurrent anterior shoulder instability. A 3D CT scan is ordered to evaluate for glenoid bone loss. The concept of the 'glenoid track' is utilized to determine if a Hill-Sachs lesion will engage the anterior glenoid rim. Which of the following formulas correctly calculates the width of the glenoid track?

. 0.83 x (diameter of normal glenoid) - (width of glenoid defect)
. 0.83 x (diameter of normal glenoid) + (width of glenoid defect)
. 1.0 x (diameter of normal glenoid) - (width of glenoid defect)
. 0.50 x (diameter of normal glenoid) - (width of glenoid defect)
. 0.75 x (diameter of normal glenoid) + (width of glenoid defect)

Correct Answer & Explanation

. 0.83 x (diameter of normal glenoid) - (width of glenoid defect)


Explanation

The glenoid track width is calculated as 83% (0.83) of the normal glenoid diameter minus the width of the anterior glenoid bone defect. If a Hill-Sachs lesion is wider than this track, it is considered 'off-track' and is at high risk for engagement and recurrent dislocation.

Question 332

Topic: Shoulder & Hip Sports

A 26-year-old male is scheduled for a Latarjet procedure due to a 20% anterior glenoid bone defect. During the procedure, the coracoid is osteotomized and transferred to the anterior glenoid. The 'sling effect' contributes significantly to the stability provided by this procedure. This dynamic effect is primarily created by the conjoint tendon compressing against which structure?

. The superior labrum
. The inferior capsule and subscapularis muscle
. The long head of the biceps tendon
. The middle glenohumeral ligament
. The pectoralis minor muscle

Correct Answer & Explanation

. The inferior capsule and subscapularis muscle


Explanation

The Latarjet procedure provides stability via a 'triple blocking' effect. The most significant soft-tissue stabilizing mechanism is the dynamic sling effect, where the conjoint tendon acts as a sling across the inferior capsule and the lower fibers of the subscapularis when the arm is abducted and externally rotated.

Question 333

Topic: Shoulder & Hip Sports

A 40-year-old male sustains a seizure and subsequently complains of severe left shoulder pain with restricted external rotation. An AP radiograph of the shoulder shows a symmetric appearance of the humeral head with a loss of the normal half-moon overlap of the humeral head and glenoid. What is the classic radiologic descriptor for this finding?

. Lightbulb sign
. Rim sign
. Trough line sign
. Crescent sign
. Drooping shoulder sign

Correct Answer & Explanation

. Trough line sign


Explanation

The 'lightbulb sign' on an AP radiograph is a classic finding of a posterior shoulder dislocation, caused by the humerus being locked in internal rotation. The 'trough line sign' represents the reverse Hill-Sachs impaction fracture on the anteromedial humeral head.

Question 334

Topic: Shoulder & Hip Sports

During arthroscopic evaluation of a patient with recurrent anterior shoulder instability, an anterior labroligamentous periosteal sleeve avulsion (ALPSA) lesion is identified. How does this primarily differ pathoanatomically from a classic Bankart lesion?

. An ALPSA involves tearing of the anterior labrum with disruption of the scapular periosteum.
. An ALPSA involves an intact anterior scapular periosteum, allowing the labrum to displace medially and inferiorly.
. An ALPSA involves an avulsion of the inferior glenohumeral ligament from the humeral neck.
. An ALPSA involves a disruption of the superior labrum extending anteriorly and posteriorly.
. An ALPSA involves an articular cartilage sheer injury adjacent to the torn labrum.

Correct Answer & Explanation

. An ALPSA involves an intact anterior scapular periosteum, allowing the labrum to displace medially and inferiorly.


Explanation

An ALPSA lesion features an avulsion of the anterior labrum where the anterior scapular periosteum remains intact, stripping medially down the glenoid neck. In contrast, a classic Bankart lesion involves a complete tear of both the labrum and the adjacent periosteum.

Question 335

Topic: Shoulder & Hip Sports

A 19-year-old collegiate wrestler suffers a first-time traumatic anterior shoulder dislocation. After successful closed reduction, what single factor places this patient at the highest statistical risk for recurrent instability if managed non-operatively?

. Patient age at the time of initial dislocation
. Presence of a non-engaging Hill-Sachs lesion
. Sport involving overhead throwing
. Initial dislocation requiring conscious sedation for reduction
. Concomitant greater tuberosity fracture

Correct Answer & Explanation

. Patient age at the time of initial dislocation


Explanation

The patient's age at the time of the initial traumatic dislocation is the single greatest predictor of recurrence. Patients under 20 years old have recurrence rates often cited between 70% to 90% when treated non-operatively.

Question 336

Topic: Shoulder & Hip Sports

In cases of critical glenoid bone loss with an off-track Hill-Sachs lesion, a remplissage procedure is often performed concurrently with a Bankart repair. What does the arthroscopic remplissage technique specifically involve?

. Bone grafting of the glenoid defect using distal clavicle autograft.
. Capsulodesis of the posterior capsule and tenodesis of the infraspinatus into the Hill-Sachs defect.
. Transfer of the lesser tuberosity into a reverse Hill-Sachs defect.
. Plication of the rotator interval to prevent inferior translation.
. Transfer of the latissimus dorsi tendon to the greater tuberosity.

Correct Answer & Explanation

. Capsulodesis of the posterior capsule and tenodesis of the infraspinatus into the Hill-Sachs defect.


Explanation

Remplissage (French for 'to fill') involves suturing the posterior joint capsule and the infraspinatus tendon into the Hill-Sachs defect. This essentially makes the humeral head defect extra-articular, preventing it from engaging the anterior glenoid rim.

Question 337

Topic: Shoulder & Hip Sports

A 32-year-old male sustains a posterior shoulder dislocation complicated by a reverse Hill-Sachs lesion that involves 30% of the articular surface. Which of the following procedures (McLaughlin procedure) was traditionally described for managing this specific bony defect?

. Transfer of the infraspinatus tendon into the defect.
. Transfer of the lesser tuberosity with the attached subscapularis into the defect.
. Transfer of the subscapularis tendon alone into the defect.
. Structural iliac crest bone grafting of the humeral head.
. Rotational osteotomy of the proximal humerus.

Correct Answer & Explanation

. Transfer of the lesser tuberosity with the attached subscapularis into the defect.


Explanation

The original McLaughlin procedure involves transferring the subscapularis tendon into the anteromedial (reverse Hill-Sachs) defect. The modified McLaughlin (Neer modification) involves transferring the lesser tuberosity along with the subscapularis tendon.

Question 338

Topic: Shoulder & Hip Sports

A 29-year-old male with recurrent anterior shoulder dislocations is undergoing a 3D CT scan to evaluate for bipolar bone loss. Based on current literature, a Hill-Sachs lesion is most likely to 'engage' the anterior glenoid rim during which specific arm position?

. Abduction and internal rotation
. Adduction and external rotation
. Abduction and external rotation
. Forward flexion and internal rotation
. Extension and internal rotation

Correct Answer & Explanation

. Abduction and external rotation


Explanation

A Hill-Sachs lesion becomes an 'engaging' lesion when its long axis becomes parallel to the anterior glenoid rim. This biomechanically occurs when the arm is positioned in abduction and external rotation (the typical position of apprehension).

Question 339

Topic: Shoulder & Hip Sports

During a Latarjet procedure, an osteotomy of the coracoid process is performed. To maximize the bone block size while avoiding detachment of the coracoclavicular ligaments, the osteotomy should be made exactly at what anatomical landmark?

. Distal to the pectoralis minor insertion
. At the 'knee' (genu) of the coracoid, just anterior to the coracoclavicular ligament insertions
. Proximal to the conoid ligament insertion at the base of the coracoid
. Distal to the short head of the biceps origin
. Through the center of the coracoclavicular ligament insertions

Correct Answer & Explanation

. At the 'knee' (genu) of the coracoid, just anterior to the coracoclavicular ligament insertions


Explanation

The coracoid osteotomy for a Latarjet should be made at the genu ('knee' or angle) of the coracoid process. This is just anterior to the insertions of the coracoclavicular (conoid and trapezoid) ligaments, which must be preserved to maintain scapuloclavicular stability.

Question 340

Topic: Shoulder & Hip Sports

A 25-year-old athlete undergoes an MRI arthrogram for chronic shoulder pain following a mild subluxation event. The scan reveals a superficial anterior-inferior labral tear associated with adjacent articular cartilage damage on the glenoid, but the anterior band of the IGHL is intact. What is the diagnosis?

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

Correct Answer & Explanation

. GLAD lesion


Explanation

A Glenolabral Articular Disruption (GLAD) lesion involves a non-displaced tear of the anterior-inferior labrum combined with an adjacent articular cartilage defect of the glenoid. Unlike Bankart variants, it typically causes anterior shoulder pain rather than clinical instability.