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Question 6401

Topic: Shoulder & Hip Sports

In rotator cuff tear arthropathy, the massive, irreparable tearing of the supraspinatus and infraspinatus tendons leads to superior migration of the humeral head. This phenomenon is biomechanically attributed to the disruption of which of the following forces?

. Transverse force couple
. Coronal force couple
. Scapulothoracic rhythm
. Glenohumeral axial load
. Biceps brachii depression

Correct Answer & Explanation

. Transverse force couple


Explanation

Superior migration of the humeral head in rotator cuff arthropathy is due to the loss of the coronal plane force couple. Normally, the inferior pull of the rotator cuff balances the superior pull of the deltoid; loss of the cuff allows the deltoid to pull the humeral head superiorly against the acromion.

Question 6402

Topic: 5. Sports Medicine

When utilizing massive structural cortical allografts in tumor reconstruction, which method of allograft processing is most detrimental to the graft's biomechanical strength, specifically decreasing its torsional strength?

. Fresh freezing at -80 degrees Celsius
. Lyophilization (freeze-drying)
. Ethylene oxide sterilization
. Gamma irradiation at 30 kGy
. Saline washing

Correct Answer & Explanation

. Fresh freezing at -80 degrees Celsius


Explanation

High-dose gamma irradiation (typically >25-30 kGy), while effective for sterilization, significantly alters the cross-linking of collagen. This drastically reduces the structural integrity and torsional strength of the cortical allograft.

Question 6403

Topic: Shoulder & Hip Sports

A 22-year-old collegiate rugby player sustains a recurrent anterior shoulder dislocation. A 3D CT scan reveals 25% anterior glenoid bone loss. Which of the following surgical procedures is most appropriate to minimize recurrence?

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

Correct Answer & Explanation

. Arthroscopic Bankart repair with capsular shift


Explanation

In the setting of significant anterior glenoid bone loss (>20-25%), soft tissue stabilization alone (Bankart repair) has unacceptably high failure rates. A bone-block procedure, such as the Latarjet (coracoid transfer), is indicated to restore the glenoid articular arc and provide a sling effect via the conjoint tendon.

Question 6404

Topic: Shoulder & Hip Sports

A 45-year-old male weightlifter presents with vague posterior shoulder pain and isolated weakness in external rotation. An MRI demonstrates an isolated paralabral cyst in the spinoglenoid notch. Which muscle is most likely to show denervation changes on EMG?

. Supraspinatus
. Infraspinatus
. Teres minor
. Deltoid
. Subscapularis

Correct Answer & Explanation

. Supraspinatus


Explanation

A cyst at the spinoglenoid notch compresses the suprascapular nerve after it has already given off motor branches to the supraspinatus, leading to isolated denervation and weakness of the infraspinatus. Entrapment further proximally at the suprascapular notch would affect both the supraspinatus and infraspinatus.

Question 6405

Topic: Shoulder & Hip Sports

A 22-year-old male rugby player presents with recurrent anterior shoulder dislocations. CT imaging with 3D reconstruction reveals a 25% anterior glenoid bone loss. What is the most appropriate surgical management to prevent further recurrences in this high-demand contact athlete?

. Arthroscopic Bankart repair with superior labral repair
. Arthroscopic Bankart repair with Remplissage
. Open Latarjet procedure
. Open capsular shift
. Arthroscopic SLAP repair

Correct Answer & Explanation

. Arthroscopic Bankart repair with superior labral repair


Explanation

In patients with recurrent anterior shoulder instability and significant glenoid bone loss (>20-25%), especially high-demand contact athletes, isolated soft tissue stabilization (Bankart repair) has unacceptably high failure rates. The Latarjet procedure (coracoid process transfer) is the gold standard, restoring the glenoid bone track and providing a 'sling effect' from the conjoint tendon.

Question 6406

Topic: Shoulder & Hip Sports

A 13-year-old male baseball pitcher complains of progressive right shoulder pain during the deceleration phase of throwing. Radiographs demonstrate widening and lateral fragmentation of the proximal humeral physis. What is the most appropriate initial management?

. Operative stabilization with smooth K-wires
. Corticosteroid injection into the subacromial space
. Absolute rest from throwing for 3 months followed by a structured rehabilitation program
. Physical therapy emphasizing immediate strengthening of the rotator cuff while continuing to pitch
. MRI to evaluate for a concomitant SLAP tear before deciding on treatment

Correct Answer & Explanation

. Operative stabilization with smooth K-wires


Explanation

Little Leaguer's shoulder is an epiphysiolysis of the proximal humerus caused by repetitive rotational stress. It is a classic overuse injury in skeletally immature throwers. The mainstay of treatment is absolute cessation of throwing (usually for 3 months) until symptoms resolve and radiographic healing is noted, followed by physical therapy and a gradual return-to-throwing program.

Question 6407

Topic: Shoulder & Hip Sports

A 62-year-old male presents with a massive, irreparable posterosuperior rotator cuff tear with preserved subscapularis function. He has significant external rotation weakness and a positive hornblower's sign. He is not a candidate for reverse total shoulder arthroplasty due to medical comorbidities, but is medically optimized for soft tissue surgery. Which tendon transfer is most appropriate to restore external rotation?

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

Correct Answer & Explanation

. Pectoralis major transfer


Explanation

Lower trapezius transfer is increasingly preferred for massive irreparable posterosuperior rotator cuff tears to restore external rotation. It has a more favorable line of pull matching the infraspinatus compared to the latissimus dorsi, which requires a significant change in vector. Latissimus dorsi transfers historically have mixed outcomes and lower trapezius transfer with graft augmentation (e.g., Achilles tendon) has shown superior biomechanics for external rotation restoration in modern literature.

Question 6408

Topic: 5. Sports Medicine

A 25-year-old elite overhead throwing athlete presents with deep shoulder pain and a 'dead arm' sensation. An MR arthrogram reveals a Type II SLAP tear. Non-operative management has failed. During arthroscopy, a significant 'peel-back' sign is noted. What is the classic gold standard surgical intervention for this specific patient population?

. Biceps tenodesis to the bicipital groove
. Biceps tenotomy
. Arthroscopic SLAP repair with suture anchors
. Debridement of the superior labrum without repair
. Open anterior capsulolabral reconstruction

Correct Answer & Explanation

. Biceps tenodesis to the bicipital groove


Explanation

A Type II SLAP tear involves detachment of the superior labrum and biceps anchor from the superior glenoid. The 'peel-back' sign is characteristic in throwing athletes. In a young, elite overhead throwing athlete, arthroscopic SLAP repair with suture anchors has historically been the gold standard to restore native throwing kinematics, whereas biceps tenodesis is often preferred in older or non-overhead athletes.

Question 6409

Topic: Shoulder & Hip Sports

A 26-year-old elite volleyball player presents with insidious onset, painless weakness of her hitting arm. Examination reveals isolated atrophy and weakness of the infraspinatus with normal supraspinatus strength. An MRI is most likely to show a cyst compressing the nerve at which location?

. Quadrilateral space
. Suprascapular notch
. Spinoglenoid notch
. Spiral groove
. Scalene triangle

Correct Answer & Explanation

. Quadrilateral space


Explanation

Compression of the suprascapular nerve at the spinoglenoid notch affects only the infraspinatus muscle. Compression more proximally at the suprascapular notch would denervate both the supraspinatus and infraspinatus.

Question 6410

Topic: Shoulder & Hip Sports

A 48-year-old heavy laborer presents with anterior shoulder pain and clicking. MRI arthrogram reveals a Type II SLAP tear. Conservative management has failed. To optimize his return to heavy labor and minimize postoperative stiffness, what is the best surgical procedure?

. Arthroscopic SLAP repair with suture anchors
. Biceps tenodesis
. Biceps tenotomy
. Labral debridement alone
. Coracoid transfer (Latarjet)

Correct Answer & Explanation

. Arthroscopic SLAP repair with suture anchors


Explanation

In older patients or manual laborers with a Type II SLAP tear, primary biceps tenodesis provides more predictable pain relief, a faster return to work, and lower rates of postoperative stiffness compared to SLAP repair.

Question 6411

Topic: Shoulder & Hip Sports

A 40-year-old male experiences a seizure and subsequently complains of shoulder pain with a locked internally rotated arm. Radiographs reveal a "lightbulb" sign on the AP view. What is the most likely associated osseous defect?

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

Correct Answer & Explanation

. Hill-Sachs lesion


Explanation

Seizures commonly cause posterior shoulder dislocations, recognized by the "lightbulb" sign due to internal rotation of the humeral head. This is frequently associated with an impaction fracture of the anteromedial humeral head, known as a reverse Hill-Sachs lesion.

Question 6412

Topic: Knee Sports

A 24-year-old professional soccer player undergoes ACL reconstruction. During arthroscopy, the surgeon evaluates the posterior compartments using a 70-degree arthroscope through the intercondylar notch. A longitudinal tear at the meniscocapsular junction of the posterior horn of the medial meniscus is identified. This lesion was not clearly visualized on the standard sagittal MRI sequences. What is the most likely biomechanical consequence if this lesion is left untreated?

. Increased anterior tibial translation and rotatory instability
. Decreased contact pressures in the medial compartment
. Lateral meniscal extrusion during weight-bearing
. Complete loss of hoop stresses equivalent to a total medial meniscectomy
. Medial patellar subluxation during active extension

Correct Answer & Explanation

. Increased anterior tibial translation and rotatory instability


Explanation

The clinical scenario describes a 'ramp lesion', which is a hidden lesion of the posterior horn of the medial meniscus (meniscocapsular junction) commonly associated with ACL tears. If left untreated, ramp lesions significantly increase anterior tibial translation and rotatory instability, leading to higher forces on the ACL graft and an increased risk of graft failure. Unlike root tears, ramp lesions do not completely disrupt the meniscal hoop stresses, so they are not biomechanically equivalent to a total meniscectomy.

Question 6413

Topic: Knee Sports
A 19-year-old female presents with recurrent lateral patellar instability. Imaging reveals a TT-TG distance of 14 mm, normal patellar height, and no significant trochlear dysplasia. She is scheduled for an isolated Medial Patellofemoral Ligament (MPFL) reconstruction. Which of the following best describes the correct anatomic femoral attachment site for the MPFL graft?
. Anterior to the medial epicondyle and distal to the adductor tubercle
. Posterior to the medial epicondyle and proximal to the adductor tubercle
. Between the medial epicondyle and the adductor tubercle
. Directly on the medial epicondyle
. Distal to the joint line on the anteromedial tibia

Correct Answer & Explanation

. Between the medial epicondyle and the adductor tubercle


Explanation

The anatomic femoral origin of the MPFL is located in a saddle-like depression between the adductor tubercle (which is proximal) and the medial epicondyle (which is distal). Radiographically, this is identified using the Schรถttle point, located approximately 1 mm anterior to the posterior femoral cortical line, 2.5 mm distal to the posterior articular border, and proximal to the level of the posterior medial epicondyle.

Question 6414

Topic: Shoulder & Hip Sports

A 22-year-old rugby player presents with recurrent anterior shoulder dislocations. CT imaging demonstrates 25% anterior glenoid bone loss. A Latarjet procedure is planned. Which of the following provides the primary mechanism of stabilization in the Latarjet procedure at 90 degrees of abduction and external rotation?

. The bony block increasing the glenoid articular arc
. The capsule repaired to the native glenoid rim
. The sling effect of the conjoint tendon across the anterior-inferior capsule
. The tensioning of the coracoacromial ligament
. The transfer of the pectoralis minor tendon

Correct Answer & Explanation

. The bony block increasing the glenoid articular arc


Explanation

The Latarjet procedure relies on a 'triple blocking' effect. The sling effect of the conjoint tendon (and subscapularis) acting as a dynamic buttress across the anterior-inferior capsule is the primary stabilizer in the vulnerable abducted/externally rotated position, accounting for 50-70% of the restored stability. The bony block and capsular repair provide the remaining stability.

Question 6415

Topic: Shoulder & Hip Sports

A 62-year-old male presents with a massive, irreparable posterosuperior rotator cuff tear. He has profound weakness in external rotation and a positive external rotation lag sign. His subscapularis is fully intact, and he has active forward elevation to 130 degrees. Which of the following tendon transfers is most classically indicated for this specific pattern of deficit?

. Pectoralis major transfer
. Pectoralis minor transfer
. Latissimus dorsi transfer
. Trapezius transfer to the anterior humerus
. Biceps rerouting

Correct Answer & Explanation

. Pectoralis major transfer


Explanation

A latissimus dorsi tendon transfer is classically indicated for younger or active patients with a massive, irreparable posterosuperior rotator cuff tear (supraspinatus and infraspinatus) who have loss of active external rotation but an intact subscapularis and preserved deltoid function. Lower trapezius transfer is also an option, but among the choices, latissimus dorsi transfer is the classic, established procedure for this defect.

Question 6416

Topic: Shoulder & Hip Sports

A 25-year-old ice hockey player is diagnosed with Femoroacetabular Impingement (FAI). Radiographs and MRI demonstrate a prominent Cam lesion with an alpha angle of 68 degrees. In this patient, where is the acetabular cartilage delamination most likely to be located?

. Anterosuperior quadrant
. Posteroinferior quadrant
. Anteroinferior quadrant
. Directly at the fovea capitis
. Posterosuperior quadrant

Correct Answer & Explanation

. Anterosuperior quadrant


Explanation

Cam-type femoroacetabular impingement is caused by an aspherical femoral head-neck junction (high alpha angle) that forcefully enters the acetabulum during flexion and internal rotation. This creates shear forces that classically cause chondral delamination and labral tears in the anterosuperior quadrant of the acetabulum (from 1 to 3 o'clock position).

Question 6417

Topic: Knee Sports

A 28-year-old skier sustains an isolated complete posterior cruciate ligament (PCL) injury. The PCL consists of two distinct functional bundles. Which statement accurately describes the biomechanics of the PCL bundles?

. The posteromedial bundle is larger and tight in extension
. The anterolateral bundle is larger and tight in flexion
. The posteromedial bundle is larger and tight in flexion
. The anterolateral bundle is smaller and tight in extension
. Both bundles are equally tight in full extension

Correct Answer & Explanation

. The posteromedial bundle is larger and tight in extension


Explanation

The PCL is composed of two main bundles: the anterolateral (AL) and the posteromedial (PM). The AL bundle is the larger and stiffer of the two, and it is tight in flexion. The PM bundle is smaller and is tightest in extension.

Question 6418

Topic: Shoulder & Hip Sports

A 45-year-old construction worker presents with chronic anterior shoulder pain and popping. MRI arthrogram reveals a Type II SLAP tear. Non-operative management has failed. Based on current evidence, which surgical intervention provides the most reliable return to work and clinical outcomes for this specific patient profile?

. Arthroscopic SLAP repair using suture anchors
. Arthroscopic debridement of the labrum without stabilization
. Biceps tenodesis
. Biceps tenotomy
. Coracoid transfer

Correct Answer & Explanation

. Arthroscopic SLAP repair using suture anchors


Explanation

In patients older than 40 years, particularly manual laborers or those with degenerative SLAP tears, biceps tenodesis has consistently shown superior clinical outcomes, lower complication rates, and a more reliable return to work compared to arthroscopic SLAP repair, which carries a high risk of postoperative stiffness and persistent pain in this demographic.

Question 6419

Topic: 5. Sports Medicine

A 14-year-old male with open physes presents with knee pain. MRI reveals a 1.5 cm osteochondral defect (OCD) on the lateral aspect of the medial femoral condyle. The overlying cartilage is intact, and there is no subchondral fluid line indicating instability. What is the most appropriate initial management?

. Arthroscopic transarticular drilling
. Arthroscopic retroarticular drilling
. Osteochondral autograft transfer (OATS)
. Non-operative management with activity restriction
. Microfracture

Correct Answer & Explanation

. Arthroscopic transarticular drilling


Explanation

In a skeletally immature patient (open physes) with a stable OCD lesion (intact cartilage, no high signal fluid line behind the lesion on T2 MRI), the initial treatment is non-operative management with activity restriction and protected weight-bearing. This has a high success rate (50-75%) in juvenile patients. Surgery is reserved for failed non-operative management or unstable lesions.

Question 6420

Topic: Shoulder & Hip Sports

A 20-year-old baseball pitcher presents with vague posterior shoulder pain during the late cocking phase of throwing. He exhibits a profound Glenohumeral Internal Rotation Deficit (GIRD). MRI arthrogram shows undersurface fraying of the supraspinatus and a posterosuperior labral tear. Which of the following is the primary pathophysiologic mechanism driving this condition (Internal Impingement)?

. Subacromial spurring causing external mechanical abrasion
. Laxity of the anterior capsule with compensatory posterior capsular contracture
. Contracture of the posteroinferior capsule leading to posterosuperior shift of the humeral head during maximum abduction/external rotation
. Hypertrophy of the coracoacromial ligament
. Congenital hypoplasia of the glenoid

Correct Answer & Explanation

. Subacromial spurring causing external mechanical abrasion


Explanation

Internal impingement in overhead throwing athletes is primarily driven by contracture of the posteroinferior capsule. This contracture leads to a Glenohumeral Internal Rotation Deficit (GIRD) and causes a posterosuperior shift of the humeral head during the late cocking phase (maximum abduction and external rotation). This shift pinches the posterosuperior rotator cuff between the greater tuberosity and the posterosuperior glenoid labrum.