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Question 121

Topic: Shoulder & Hip Sports

A 24-year-old overhead athlete undergoes an arthroscopic Bankart repair for recurrent anterior shoulder instability. Which of the following structural lesions must be addressed to minimize the risk of recurrent instability postoperatively?

. SLAP lesion
. Engaging Hill-Sachs lesion
. Subacromial impingement
. Type II acromion
. Buford complex

Correct Answer & Explanation

. Engaging Hill-Sachs lesion


Explanation

An engaging Hill-Sachs lesion can lever the humeral head out of the glenoid when the shoulder is in abduction and external rotation. If not addressed (e.g., via a remplissage procedure or bone block), it significantly increases the risk of recurrent instability.

Question 122

Topic: Shoulder & Hip Sports

Which of the following muscles is first affected in facioscapulohumeral dystrophy:

. Orbicularis oris
. Serratus anterior
. Deltoid
. Supraspinatus
. Infraspinatus

Correct Answer & Explanation

. Orbicularis oris


Explanation

In facioscapulohumeral dystrophy, the facial muscles are affected first, commonly presenting with an inability to whistle. The serratus muscles and scapular stabilizers are affected next. The deltoid, supraspinatus, and infraspinatus are typically not affected in this disease.

Question 123

Topic: Shoulder & Hip Sports

A 20-year-old collegiate wrestler undergoes an arthroscopic Bankart repair. During the procedure, an engaging Hill-Sachs lesion is noted that drops into the glenoid rim in abduction and external rotation. Which of the following procedures should be added to prevent recurrence?

. Latarjet procedure
. Remplissage procedure
. SLAP repair
. Biceps tenodesis
. Coracoclavicular ligament reconstruction

Correct Answer & Explanation

. Remplissage procedure


Explanation

An engaging Hill-Sachs lesion can lever the humeral head out of the glenoid, leading to failure of an isolated Bankart repair. The arthroscopic remplissage procedure tenodeses the infraspinatus tendon into the defect, converting it to an extra-articular non-engaging lesion.

Question 124

Topic: Shoulder & Hip Sports

A 24-year-old male sustains recurrent anterior shoulder dislocations. Imaging demonstrates an engaging Hill-Sachs lesion and 25% bone loss of the anterior inferior glenoid. What is the most appropriate surgical intervention?

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

Correct Answer & Explanation

. Latarjet procedure


Explanation

In patients with recurrent anterior shoulder instability and significant anterior glenoid bone loss (>20-25%), isolated soft tissue repairs have unacceptably high failure rates. A bony augmentation procedure, such as the Latarjet (coracoid transfer), is required.

Question 125

Topic: Shoulder & Hip Sports

During an arthroscopic Bankart repair for recurrent anterior shoulder instability, a large Hill-Sachs lesion is noted. This lesion is anatomically described as an impaction fracture of the:

. Anteroinferior glenoid rim
. Anteromedial humeral head
. Posterosuperior glenoid rim
. Posterolateral humeral head
. Posteromedial humeral head

Correct Answer & Explanation

. Posterolateral humeral head


Explanation

A Hill-Sachs lesion is a cortical impaction fracture of the posterolateral humeral head created when it strikes the firm anterior glenoid rim during an anterior shoulder dislocation.

Question 126

Topic: Shoulder & Hip Sports

A 21-year-old collegiate linebacker has a history of recurrent anterior shoulder dislocations. A 3D CT scan reveals 28% anterior glenoid bone loss and an engaging Hill-Sachs lesion. What is the most appropriate definitive surgical intervention?

. Arthroscopic Bankart repair
. Arthroscopic Bankart repair with Remplissage
. Coracoid transfer (Latarjet procedure)
. Open inferior capsular shift
. Proximal humerus derotational osteotomy

Correct Answer & Explanation

. Coracoid transfer (Latarjet procedure)


Explanation

In a high-demand contact athlete with critical anterior glenoid bone loss (typically greater than 20-25%), isolated soft-tissue stabilization has an unacceptably high failure rate. A bony augmentation procedure such as the Latarjet coracoid transfer is the standard of care.

Question 127

Topic: Shoulder & Hip Sports

A 20-year-old swimmer presents with recurrent anterior shoulder instability. An MRI arthrogram demonstrates an anterior labroligamentous avulsion where the anterior scapular periosteum remains intact but is stripped medially. Which lesion does this describe?

. Bankart lesion
. ALPSA lesion
. GLAD lesion
. HAGL lesion
. SLAP tear

Correct Answer & Explanation

. ALPSA lesion


Explanation

An ALPSA (Anterior Labroligamentous Periosteal Sleeve Avulsion) lesion occurs when the labrum is avulsed but the anterior scapular periosteum remains intact, allowing the labrum to heal in a displaced, medialized position.

Question 128

Topic: Shoulder & Hip Sports

A 60-year-old patient undergoes an arthroscopic rotator cuff repair for a massive crescent-shaped tear. Biomechanically, what is the primary advantage of utilizing a double-row repair construct compared to a single-row repair?

. Decreased surgical time and implant cost
. Increased pressurized footprint contact area
. Lower incidence of post-operative adhesive capsulitis
. Elimination of the need for postoperative immobilization
. Decreased risk of iatrogenic suprascapular nerve injury

Correct Answer & Explanation

. Increased pressurized footprint contact area


Explanation

Double-row rotator cuff repairs biomechanically provide a significantly larger and more pressurized contact area between the tendon and the tuberosity footprint. This promotes superior biologic healing rates compared to single-row constructs.

Question 129

Topic: Shoulder & Hip Sports

A 28-year-old male with recurrent anterior shoulder instability is found to have a Hill-Sachs lesion on MRI. Which of the following best describes the anatomic nature of this lesion?

. An avulsion of the anteroinferior glenoid labrum
. A tear of the superior labrum from anterior to posterior
. A purely cartilaginous defect on the anteromedial humeral head
. A compression fracture of the posterolateral aspect of the humeral head
. A bony avulsion of the inferior glenohumeral ligament from the anatomic neck

Correct Answer & Explanation

. A compression fracture of the posterolateral aspect of the humeral head


Explanation

A Hill-Sachs lesion is an impaction fracture of the posterolateral humeral head. It is created when the humeral head strikes the sharp anterior glenoid rim during an anterior glenohumeral dislocation.

Question 130

Topic: Shoulder & Hip Sports

A 26-year-old professional volleyball player presents with insidious onset of posterior shoulder pain and isolated, profound weakness in external rotation. MRI reveals a paralabral cyst. In which anatomical location is the cyst most likely compressing the suprascapular nerve?

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

Correct Answer & Explanation

. Spinoglenoid notch


Explanation

Compression of the suprascapular nerve at the spinoglenoid notch affects only the branch to the infraspinatus, leading to isolated external rotation weakness. Compression at the suprascapular notch would also involve the supraspinatus, causing weakness in forward elevation.

Question 131

Topic: Shoulder & Hip Sports
A 15-year-old boy presented with inability to elevate his right shoulder and flex his elbow. He sustained a fall from an all-terrain vehicle 8 weeks ago. He landed on the right shoulder and twisted his neck. Radiographs of the skull, chest, cervical and thoracic spine, and shoulder were normal. There was no loss of consciousness, chest pain, or breathing difficulties. The patient was observed in the hospital until stable and referred for follow-up in the hand clinic at 4 weeks. An electromyelogram (EMG) was scheduled. Clinical examination revealed weakness of deltoid, supraspinatus, infraspinatus, teres minor, biceps, brachialis, brachioradialis, and extensor carpi radialis longus. The remainder of his forearm musculature was preserved and he could grasp, release, and pinch. Sensations were decreased along the distribution of the axillary nerve. There was 3 cm wasting of his arm and 2 cm of the forearm. Tinel's sign is positive around the clavicle. Horner's signs are absent and his arm lies against the body. The EMG report showed fibrillation potentials in the weak muscles. The patient can now flex his elbow. When asked to demonstrate, he flexes his wrist and pronates his forearm to swing his elbow into flexion. The least helpful test in further management of this patient is:
. Magnetic resonance imaging (MRI)
. Computed tomography (CT) scan of the neck
. Repeat electromyelogram (EMG) after 4 weeks
. Somatosensory evoked potential (SSEP)
. Careful neurological examination

Correct Answer & Explanation

. Careful neurological examination


Explanation

Computed tomography scan of the cervical spine will not show the pseudomeningoceles nor provide any information on brachial plexus. Computed tomography may be needed in case of a suspected neck injury but does not form part of a brachial plexus work up.

Question 132

Topic: Shoulder & Hip Sports
A 15-year-old boy presented with inability to elevate his right shoulder and flex his elbow. He sustained a fall from an all-terrain vehicle 8 weeks ago. He landed on the right shoulder and twisted his neck. Radiographs of the skull, chest, cervical and thoracic spine, and shoulder were normal. There was no loss of consciousness, chest pain, or breathing difficulties. The patient was observed in the hospital until stable and referred for follow-up in the hand clinic at 4 weeks. An electromyelogram (EMG) was scheduled. Clinical examination revealed weakness of deltoid, supraspinatus, infraspinatus, teres minor, biceps, brachialis, brachioradialis, and extensor carpi radialis longus. The remainder of his forearm musculature was preserved and he could grasp, release, and pinch. Sensations were decreased along the distribution of the axillary nerve. There was 3 cm wasting of his arm and 2 cm of the forearm. Tinel's sign is positive around the clavicle. Horner's signs are absent and his arm lies against the body. The EMG report showed fibrillation potentials in the weak muscles. The patient can now flex his elbow. When asked to demonstrate, he flexes his wrist and pronates his forearm to swing his elbow into flexion. The most important indication for early exploration in this patient is:
. Absence of biceps function at 3 months
. Absence of biceps function with return of extensor carpi radialis longus (ECRL) power at 4 months
. Presence of trick movements
. Subluxation of humeral head on radiographs
. Weakness of the supraspinatus

Correct Answer & Explanation

. Absence of biceps function with return of extensor carpi radialis longus (ECRL) power at 4 months


Explanation

An important indication for early exploration is the recovery of a distally supplied muscle, ECRL C6, in the absence of a proximally supplied muscle, biceps C5. Trick movements are adaptive movements employed by the patient by recruiting other muscles, for example, the use of flexor-pronator as elbow flexors in this patient. Bony deformity is a late sequelae and biceps recovery at 3 months is important in obstetric brachial palsy.

Question 133

Topic: Shoulder & Hip Sports

A 4-month-old infant with obstetric brachial plexus palsy presents with an internal rotation contracture of the shoulder and complete absence of active biceps function. Wrist extension is also absent. What is the most appropriate next step in management?

. Observation for an additional 3 months
. Immediate nerve exploration and reconstruction
. Latissimus dorsi to rotator cuff transfer
. Botulinum toxin injection into the triceps
. Shoulder arthrodesis

Correct Answer & Explanation

. Immediate nerve exploration and reconstruction


Explanation

The absolute absence of biceps recovery by 3 to 4 months of age in obstetric brachial plexus palsy is a widely accepted surgical indication for nerve exploration. Delaying microsurgical reconstruction beyond this period leads to significantly poorer functional motor recovery.

Question 134

Topic: Shoulder & Hip Sports

A 40-year-old male presents with sudden, severe, unprovoked right shoulder pain lasting for 2 weeks. As the pain subsides, he notices profound weakness in shoulder abduction and external rotation. EMG demonstrates denervation potentials in the supraspinatus and infraspinatus muscles. What is the most likely diagnosis?

. Massive rotator cuff tear
. Cervical radiculopathy
. Parsonage-Turner syndrome
. Quadrilateral space syndrome
. Suprascapular nerve entrapment at the spinoglenoid notch

Correct Answer & Explanation

. Parsonage-Turner syndrome


Explanation

Parsonage-Turner syndrome (acute brachial neuritis) classically presents with an initial phase of severe shoulder girdle pain followed by patchy muscle weakness and atrophy as the pain abates. It most commonly affects the suprascapular nerve, long thoracic nerve, or axillary nerve, and is primarily treated conservatively.

Question 135

Topic: Shoulder & Hip Sports

A 32-year-old professional volleyball player presents with an insidious onset of posterior shoulder pain and progressive weakness in external rotation. Clinical examination shows isolated atrophy of the infraspinatus muscle with a completely normal supraspinatus muscle bulk and strength. Where is the most likely site of nerve compression?

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

Correct Answer & Explanation

. Spinoglenoid notch


Explanation

Compression of the suprascapular nerve at the spinoglenoid notch affects only the distal branch that supplies the infraspinatus, leading to isolated infraspinatus weakness. Conversely, compression at the suprascapular notch would affect both the supraspinatus and infraspinatus muscles.

Question 136

Topic: Shoulder & Hip Sports

When evaluating a patient with recurrent anterior shoulder instability, what specifically defines an "off-track" Hill-Sachs lesion?

. A purely cartilaginous defect on the posterior humeral head.
. A Hill-Sachs lesion that is wider than the intact anterior glenoid track, predisposing it to engage.
. A lesion that engages only when the arm is in maximal internal rotation.
. A bony defect on the glenoid rim that spans more than 25% of the glenoid width.

Correct Answer & Explanation

. A Hill-Sachs lesion that is wider than the intact anterior glenoid track, predisposing it to engage.


Explanation

The glenoid track concept evaluates the interaction between glenoid bone loss and the Hill-Sachs lesion. An "off-track" lesion occurs when the Hill-Sachs interval is wider than the remaining intact glenoid track, causing the lesion to engage the anterior glenoid rim during abduction and external rotation.

Question 137

Topic: Shoulder & Hip Sports

A 24-year-old overhead throwing athlete presents with posterior shoulder pain. Physical examination reveals a positive active compression test (O'Brien test) that elicits deep joint pain with the forearm pronated, which is relieved with the forearm in supination. What is the most likely associated finding on MR arthrography?

. Anterior labral periosteal sleeve avulsion (ALPSA)
. Anterior-inferior Bankart lesion
. Superior labrum anterior to posterior (SLAP) tear
. Posterior reverse Bankart lesion
. Engaging Hill-Sachs lesion

Correct Answer & Explanation

. Superior labrum anterior to posterior (SLAP) tear


Explanation

The active compression test (O'Brien test) is sensitive for SLAP tears. Pain is characteristically elicited with the arm in internal rotation/pronation (which tensions the biceps root) and relieved when the arm is supinated.

Question 138

Topic: Shoulder & Hip Sports

A 40-year-old male suffers a seizure and subsequently complains of severe right shoulder pain. Radiographs show a "lightbulb" sign on the AP view and an empty glenoid sign. What is the most common associated bony defect seen with this specific injury?

. Bankart lesion
. Hill-Sachs lesion
. Reverse Hill-Sachs lesion
. Greater tuberosity fracture
. Coracoid process fracture

Correct Answer & Explanation

. Reverse Hill-Sachs lesion


Explanation

The patient has a posterior shoulder dislocation, classically caused by seizures or electrical shock. The most common associated defect is a reverse Hill-Sachs lesion, which is an impaction fracture of the anteromedial humeral head.

Question 139

Topic: Shoulder & Hip Sports

In the evaluation of anterior shoulder instability, an Anterior Labroligamentous Periosteal Sleeve Avulsion (ALPSA) lesion differs from a classic Bankart lesion in which of the following ways?

. The anterior scapular periosteum remains intact
. The labrum is avulsed along with a glenoid bone fragment
. The labrum is avulsed with the long head of the biceps tendon
. The posterior capsule is structurally compromised
. The glenohumeral ligaments are entirely avulsed from the humerus

Correct Answer & Explanation

. The anterior scapular periosteum remains intact


Explanation

In an ALPSA lesion, the anterior labrum is avulsed from the glenoid rim, but the anterior scapular periosteum remains intact. This intact periosteal sleeve allows the labroligamentous complex to displace medially and inferiorly.

Question 140

Topic: Shoulder & Hip Sports
A 15-year-old white boy presents to your office with inability to elevate his right shoulder and flex his elbow. He sustained a fall from an all-terrain vehicle 8 weeks ago. He landed on the right shoulder and says his neck was twisted away at the time of fall. He was seen at the local emergency department; skull, chest, cervical and thoracic spine, and shoulder X-rays showed no damage. There was no loss of consciousness and he has no chest pain or breathing difficulties. He was observed in the hospital until stable and was referred to follow up in the hand clinic at 4 weeks and scheduled for an electromyogram. Clinical examination reveals weakness of deltoid, supraspinatus, infraspinatus, teres minor, biceps, brachialis, brachioradialis, and extensor carpi radialis longus. The remainder of his forearm musculature is preserved and he can grasp and release and pinch. Sensations are decreased along the distribution of the axillary nerve. There is 3 cm wasting of his arm and 2 cm of his forearm. Tinel sign is positive around the clavicle. Horner signs are absent and his arm lies against the body. The EMG report shows fibrillation potentials in the weak muscles. The parents are concerned and say they have not seen any improvement. The boy reports that he is now able to flex his elbow. When asked to demonstrate you notice that he flexes his wrist and pronates his forearm to swing his elbow into flexion. What is the least helpful test in further management of this patient?
. Magnetic resonance imaging
. Computed tomography scan of the neck
. Repeat electromyogram after 4 weeks
. Somatosensory evoked potential (SSEP)

Correct Answer & Explanation

. Computed tomography scan of the neck


Explanation

Computed tomography scan of the cervical spine will not be of any use as it will neither show the pseudomeningoceles nor provide any information on the brachial plexus. CT scan may be needed in case of a suspected neck injury but does not form part of a brachial plexus workup.