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Question 6061

Topic: 5. Sports Medicine

A 25-year-old elite overhead throwing athlete undergoes arthroscopy for a symptomatic Type II SLAP tear that failed conservative management. What is the pathomechanical basis of this injury during the late cocking phase of throwing?

. Subcoracoid impingement
. Peel-back mechanism
. Internal impingement of the anterior band of the IGHL
. Traction from the long head of the triceps
. Excessive glenohumeral internal rotation (GIRD)

Correct Answer & Explanation

. Subcoracoid impingement


Explanation

The 'peel-back' mechanism occurs during the late cocking phase of throwing (maximum abduction and external rotation), placing a torsional force on the biceps anchor that dynamically peels the superior labrum off the glenoid rim.

Question 6062

Topic: 5. Sports Medicine

A 22-year-old overhead throwing athlete complains of deep shoulder pain during the late cocking phase of throwing. MR arthrography reveals a Type II Superior Labrum Anterior to Posterior (SLAP) tear. Which of the following best describes the specific anatomical pathology of a Type II SLAP lesion?

. Fraying of the superior labrum with a securely attached biceps anchor
. Detachment of the superior labrum and the origin of the long head of the biceps from the superior glenoid
. A bucket-handle tear of the superior labrum with an intact biceps anchor
. A bucket-handle tear of the superior labrum that extends into the biceps tendon
. Extension of an anteroinferior Bankart lesion into the superior labrum

Correct Answer & Explanation

. Fraying of the superior labrum with a securely attached biceps anchor


Explanation

A Type II SLAP tear involves detachment of the superior labrum and the biceps anchor from the superior glenoid tubercle. This results in superior labral instability, particularly during the peel-back mechanism in overhead sports.

Question 6063

Topic: Knee Sports

In a cruciate-retaining (CR) total knee arthroplasty, the posterior cruciate ligament (PCL) is preserved. If the PCL is left excessively tight during the procedure, what kinematic abnormality is most likely to occur?

. Excessive anterior rollback of the femur in flexion
. Paradoxical anterior slide of the femur in early flexion
. Excessive posterior rollback of the femur leading to limited flexion
. Patella baja
. Hyperextension instability

Correct Answer & Explanation

. Excessive anterior rollback of the femur in flexion


Explanation

In a CR TKA, an excessively tight PCL will pull the femur excessively posterior during flexion (excessive posterior rollback), which can lead to limited knee flexion, excessive wear on the posterior aspect of the polyethylene insert, and lift-off of the anterior tibial tray. Paradoxical anterior slide is typically seen when the PCL is deficient or incompetent in a CR knee.

Question 6064

Topic: 5. Sports Medicine

In revision TKA for severe AORI Type 2b or 3 metaphyseal bone defects, highly porous metaphyseal titanium cones are increasingly utilized. What is their primary biomechanical and biologic advantage over standard structural allografts?

. They actively remodel into host cortical bone over a 2-year period.
. They provide immediate rigid fixation and allow for long-term biologic osteointegration.
. They are flexible load-sharing devices that entirely prevent stress shielding.
. They allow for dynamic micromotion at the implant-bone interface.
. They are completely radiolucent, allowing for superior postoperative MRI evaluation.

Correct Answer & Explanation

. They actively remodel into host cortical bone over a 2-year period.


Explanation

Highly porous titanium metaphyseal cones offer excellent early rigid mechanical stability (often a 'scratch fit' in the metaphysis) and long-term biologic fixation through osteointegration. This overcomes the major limitations of structural bulk allografts, which suffer from nonunion, late resorption, and eventual collapse.

Question 6065

Topic: Shoulder & Hip Sports

A 22-year-old football player sustains recurrent anterior shoulder dislocations. Preoperative imaging

reveals 25% anterior glenoid bone loss. What is the most appropriate surgical intervention to minimize recurrence?

. Arthroscopic Bankart repair
. Latarjet procedure
. Remplissage procedure
. Arthroscopic capsular shift
. Putti-Platt procedure

Correct Answer & Explanation

. Arthroscopic Bankart repair


Explanation

In patients with significant anterior glenoid bone loss (>20-25%), isolated soft-tissue procedures (like arthroscopic Bankart repair) have unacceptably high failure rates. The Latarjet procedure (coracoid transfer) addresses the bony defect and provides a sling effect via the conjoint tendon to stabilize the shoulder anteriorly.

Question 6066

Topic: Shoulder & Hip Sports

A 30-year-old elite volleyball player complains of vague posterior shoulder pain and weakness in external rotation. Examination reveals isolated atrophy of the infraspinatus with preserved supraspinatus bulk. Where is the most likely site of nerve compression?

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

Correct Answer & Explanation

. Suprascapular notch


Explanation

Isolated infraspinatus weakness and atrophy points to compression of the suprascapular nerve at the spinoglenoid notch, frequently caused by ganglion cysts in overhead athletes. Compression more proximally at the suprascapular notch would affect both the supraspinatus and infraspinatus.

Question 6067

Topic: 5. Sports Medicine
During diagnostic arthroscopy on a 26-year-old baseball pitcher, the surgeon identifies a SLAP lesion characterized by a bucket-handle tear of the superior labrum with an intact biceps anchor. What type of SLAP tear is this according to Snyder's classification?
. Type I
. Type II
. Type III
. Type IV
. Type V

Correct Answer & Explanation

. Type III


Explanation

SLAP tears are classified by Snyder. Type I is fraying of the superior labrum. Type II is detachment of the superior labrum and biceps anchor. Type III is a bucket-handle tear of the superior labrum with an intact biceps anchor. Type IV is a bucket-handle tear extending into the biceps tendon.

Question 6068

Topic: Shoulder & Hip Sports

A 45-year-old male presents to the ED after a generalized tonic-clonic seizure. His shoulder is locked in internal rotation and he is unable to externally rotate. Radiographs show a 'lightbulb' sign. Which of the following associated injuries is most frequently seen in this condition?

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

Correct Answer & Explanation

. Bankart lesion


Explanation

The patient has a posterior shoulder dislocation, commonly caused by seizures or electrical shocks due to the powerful internal rotators overpowering the external rotators. The 'lightbulb' sign on AP radiograph is classic. The most common associated injury is an impaction fracture of the anteromedial humeral head, known as a reverse Hill-Sachs lesion.

Question 6069

Topic: Shoulder & Hip Sports

A 55-year-old laborer has a massive, irreparable posterosuperior rotator cuff tear. He has an intact subscapularis and a negative hornblower's sign. He struggles primarily with loss of active external rotation and elevation. Which tendon transfer is most historically validated and appropriate for this specific deficit pattern?

. Pectoralis major transfer
. Latissimus dorsi transfer
. Lower trapezius transfer
. Pectoralis minor transfer
. Levator scapulae transfer

Correct Answer & Explanation

. Pectoralis major transfer


Explanation

The latissimus dorsi tendon transfer is traditionally indicated for irreparable posterosuperior rotator cuff tears (supraspinatus and infraspinatus) in younger, active patients with an intact subscapularis and functioning deltoid. It helps restore external rotation and forward flexion.

Question 6070

Topic: Shoulder & Hip Sports

A 24-year-old professional baseball pitcher presents with posterior shoulder pain during the late cocking phase of throwing. He exhibits a GIRD (glenohumeral internal rotation deficit) of 25 degrees. What is the primary pathophysiologic mechanism of his shoulder pain?

. Subacromial bursitis compressing the supraspinatus
. Contact between the undersurface of the rotator cuff and the posterosuperior glenoid labrum
. Anterior subcoracoid impingement
. SLAP II tear causing biceps anchor instability
. Suprascapular nerve entrapment at the spinoglenoid notch

Correct Answer & Explanation

. Subacromial bursitis compressing the supraspinatus


Explanation

Internal impingement typically occurs in overhead athletes during extreme external rotation and abduction (late cocking phase). The articular undersurface of the supraspinatus/infraspinatus tendons is dynamically pinched or impinged against the posterosuperior glenoid rim and labrum.

Question 6071

Topic: Shoulder & Hip Sports

A 55-year-old male sustains an anterior shoulder dislocation. Post-reduction, he has numbness over the lateral aspect of his shoulder and inability to actively abduct his arm. An EMG performed at 3 weeks shows fibrillation potentials in the deltoid. What is the most appropriate management?

. Immediate exploration and sural nerve grafting
. Nerve transfer (e.g., Somsak procedure) immediately
. Observation and physical therapy with repeat clinical exams
. Primary end-to-end repair of the axillary nerve
. Latarjet procedure to stabilize the capsule

Correct Answer & Explanation

. Immediate exploration and sural nerve grafting


Explanation

Axillary nerve neurapraxia or axonotmesis is common after anterior shoulder dislocations, particularly in older patients. Most recover spontaneously. An EMG at 3 weeks showing fibrillations confirms denervation, but clinical recovery can still occur over 3-6 months. Observation and physical therapy to maintain ROM is the initial step; surgical exploration is reserved for failure to improve clinically or electrically by 3-6 months.

Question 6072

Topic: Shoulder & Hip Sports

A 40-year-old male presents with severe, acute-onset right shoulder pain that lasted for two weeks, awakened him from sleep, and has now transitioned into profound weakness of shoulder abduction and external rotation. He reports a recent viral respiratory illness. MRI of the shoulder is unremarkable. What is the most likely diagnosis?

. Acute massive rotator cuff tear
. Cervical radiculopathy (C5-C6)
. Parsonage-Turner syndrome (neuralgic amyotrophy)
. Quadrilateral space syndrome
. Suprascapular nerve entrapment by a spinoglenoid cyst

Correct Answer & Explanation

. Acute massive rotator cuff tear


Explanation

Parsonage-Turner syndrome (idiopathic brachial neuritis) classically presents with acute, severe shoulder pain that awakens the patient at night. As the pain subsides over days to weeks, patients develop patchy weakness and atrophy (commonly affecting the upper trunk: deltoid, supraspinatus, infraspinatus). It is often preceded by a viral illness or vaccination. The lack of MRI findings rules out acute structural tears.

Question 6073

Topic: Shoulder & Hip Sports

A 31-year-old male volleyball player presents with insidious onset of right shoulder weakness. Physical exam reveals notable atrophy of the infraspinatus fossa but normal bulk of the supraspinatus. External rotation strength is significantly decreased, while abduction strength is preserved. What is the most likely etiology of this patient's condition?

. A ganglion cyst at the suprascapular notch
. A ganglion cyst at the spinoglenoid notch
. Anterior shoulder instability causing axillary nerve stretch
. Traction injury to the upper trunk of the brachial plexus
. Parsonage-Turner syndrome

Correct Answer & Explanation

. A ganglion cyst at the suprascapular notch


Explanation

Isolated infraspinatus atrophy and weakness point to compression of the suprascapular nerve at the spinoglenoid notch. At this location, the nerve has already given off its motor branch to the supraspinatus, so supraspinatus function (abduction) remains intact. This is frequently caused by a ganglion cyst associated with a posterior labral tear. Compression at the suprascapular notch would affect both the supraspinatus and infraspinatus.

Question 6074

Topic: Shoulder & Hip Sports

The Latarjet procedure involves transfer of the coracoid process to the anterior glenoid neck. During the approach, the subscapularis muscle is often split longitudinally. Which nerve is at greatest risk of iatrogenic injury if this split is extended too far medially?

. Axillary nerve
. Musculocutaneous nerve
. Suprascapular nerve
. Radial nerve
. Spinal accessory nerve

Correct Answer & Explanation

. Axillary nerve


Explanation

During the subscapularis split for a Latarjet or anterior stabilization procedure, the axillary nerve is at risk if the split is extended too far medially. The axillary nerve courses inferior to the capsule and crosses the anterior subscapularis muscle belly medially before entering the quadrilateral space. The musculocutaneous nerve is also at risk during a Latarjet, but primarily during coracoid preparation and retraction of the conjoint tendon.

Question 6075

Topic: Shoulder & Hip Sports

A 55-year-old male presents with a massive, irreparable tear of the subscapularis tendon following a failed repair. He complains of debilitating anterior pain, has a positive belly-press test, and increased passive external rotation. Which tendon transfer is most appropriate to restore anterior shoulder function?

. Latissimus dorsi
. Lower trapezius
. Pectoralis major
. Teres major
. Biceps brachii

Correct Answer & Explanation

. Latissimus dorsi


Explanation

The pectoralis major transfer is the most commonly utilized and reliable tendon transfer for massive, irreparable subscapularis tears to restore internal rotation and anterior stability. In contrast, latissimus dorsi and lower trapezius transfers are indicated for irreparable posterosuperior rotator cuff tears (supraspinatus and infraspinatus).

Question 6076

Topic: Shoulder & Hip Sports

A 48-year-old manual laborer has a massive, retracted, and fatty-infiltrated tear of the supraspinatus and infraspinatus. He lacks active external rotation and has a positive external rotation lag sign, but has intact subscapularis function and no significant glenohumeral arthritis. Which tendon transfer is most indicated for this patient?

. Pectoralis major transfer
. Latissimus dorsi transfer
. Pectoralis minor transfer
. Coracobrachialis transfer
. Triceps transfer

Correct Answer & Explanation

. Pectoralis major transfer


Explanation

A latissimus dorsi (or lower trapezius) tendon transfer is indicated for a young, active patient with an irreparable posterosuperior rotator cuff tear resulting in deficient external rotation and elevation, provided there is no significant glenohumeral arthritis. An intact subscapularis is essential for a successful latissimus dorsi transfer to balance the force couples.

Question 6077

Topic: Shoulder & Hip Sports

A 65-year-old female sustains an anterior shoulder dislocation. After successful closed reduction in the emergency department, post-reduction radiographs reveal a concentric glenohumeral joint but a displaced greater tuberosity fracture with 7 mm of superior displacement. What is the most appropriate management?

. Sling immobilization for 2 weeks followed by physical therapy
. Surgical fixation of the greater tuberosity
. Figure-of-eight brace
. Open Bankart repair
. Total shoulder arthroplasty

Correct Answer & Explanation

. Sling immobilization for 2 weeks followed by physical therapy


Explanation

In the setting of an anterior shoulder dislocation with an associated greater tuberosity fracture, conservative management is typically acceptable if the tuberosity fragment is displaced < 5 mm after reduction. Displacement > 5 mm, especially superior displacement, increases the risk of subacromial impingement and rotator cuff dysfunction, warranting surgical fixation (ORIF or arthroscopic repair).

Question 6078

Topic: Shoulder & Hip Sports

A 40-year-old male presents to the ER after a generalized seizure. He holds his right arm firmly in internal rotation and adduction. Radiographs confirm a posterior glenohumeral dislocation. After closed reduction, a CT scan shows a reverse Hill-Sachs lesion involving 25% of the humeral head articular surface. Which of the following is the most appropriate surgical treatment?

. Arthroscopic posterior Bankart repair alone
. Transfer of the lesser tuberosity into the defect (Modified McLaughlin procedure)
. Open reduction and internal fixation of the defect with headless screws
. Total shoulder arthroplasty
. Hemiarthroplasty

Correct Answer & Explanation

. Arthroscopic posterior Bankart repair alone


Explanation

A reverse Hill-Sachs lesion is an anteromedial impaction fracture of the humeral head resulting from a posterior dislocation. For defects involving 20-40% of the articular surface, transferring the subscapularis tendon (McLaughlin procedure) or the lesser tuberosity with the attached subscapularis (Modified McLaughlin procedure) into the defect is the treatment of choice. This prevents the defect from engaging the posterior glenoid and prevents recurrent instability.

Question 6079

Topic: Shoulder & Hip Sports

In a 65-year-old sedentary patient undergoing arthroscopic rotator cuff repair, a severely frayed and subluxated long head of the biceps tendon is noted. The surgeon decides to perform a biceps tenotomy rather than a tenodesis. Compared to tenodesis, which of the following is the most likely outcome of tenotomy?

. Higher rate of postoperative shoulder stiffness
. Increased risk of anterior shoulder instability
. Higher incidence of cosmetic "Popeye" deformity
. Better long-term forward elevation strength
. Increased incidence of complex regional pain syndrome

Correct Answer & Explanation

. Higher rate of postoperative shoulder stiffness


Explanation

Biceps tenotomy and tenodesis both provide excellent pain relief for pathology of the long head of the biceps. Tenotomy is faster, requires no implants, and allows for an immediate postoperative rehabilitation protocol. However, it is associated with a significantly higher rate of cosmetic "Popeye" deformity (distal migration of the biceps muscle belly) and occasional cramping. Tenodesis minimizes the cosmetic deformity but carries a small risk of implant-related complications and requires a more protected initial rehabilitation.

Question 6080

Topic: Shoulder & Hip Sports

A 22-year-old collegiate baseball pitcher complains of posterior shoulder pain during the late cocking phase of throwing. Physical examination reveals a glenohumeral internal rotation deficit (GIRD) of 25 degrees compared to the contralateral side. Which of the following best describes the pathophysiology of his internal impingement?

. Impingement of the supraspinatus tendon against the coracoacromial ligament
. Impingement of the articular surface of the supraspinatus/infraspinatus between the greater tuberosity and the posterosuperior glenoid
. Impingement of the subscapularis tendon against the coracoid process
. Impingement of the biceps tendon against the acromion
. Hypertrophy of the teres minor leading to axillary nerve compression

Correct Answer & Explanation

. Impingement of the supraspinatus tendon against the coracoacromial ligament


Explanation

Internal impingement typically occurs in overhead athletes during the late cocking phase (abduction and maximal external rotation). It involves the impingement of the undersurface (articular surface) of the posterior supraspinatus and anterior infraspinatus tendons between the greater tuberosity of the humerus and the posterosuperior glenoid labrum.