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Question 4161

Topic: Knee Sports

During a medial patellofemoral ligament (MPFL) reconstruction for recurrent patellar instability, the surgeon inadvertently places the femoral tunnel proximal and anterior to the true anatomic insertion (Schottle's point). This malpositioning will cause the graft to be:

. Tight in extension and loose in flexion
. Loose in extension and tight in flexion
. Isometrically tensioned throughout the arc of motion
. Over-constrained causing medial patellar subluxation in extension
. Prone to patellar fracture

Correct Answer & Explanation

. Tight in extension and loose in flexion


Explanation

A femoral tunnel placed too proximal and anterior to the anatomic MPFL footprint increases the distance to the patella as the knee flexes. This results in a graft that is inappropriately loose in extension and excessively tight in flexion.

Question 4162

Topic: Knee Sports

A 30-year-old man presents with chronic knee pain 10 years after sustaining an isolated, untreated Grade III PCL tear. Based on the altered kinematics of a PCL-deficient knee, which compartments are most likely to demonstrate advanced osteoarthritic changes?

. Medial and patellofemoral
. Lateral and patellofemoral
. Medial and lateral
. Lateral only
. Medial only

Correct Answer & Explanation

. Medial and patellofemoral


Explanation

Chronic PCL deficiency causes posterior tibial translation, which alters knee kinematics and leads to significantly increased contact pressures. This predictably causes premature osteoarthritis in the medial compartment and the patellofemoral joint.

Question 4163

Topic: 5. Sports Medicine

A 24-year-old professional soccer player presents with a symptomatic, isolated 3.5 cm^2 full-thickness chondral defect on the weight-bearing surface of the medial femoral condyle.

Conservative management has failed. Which of the following is the most appropriate surgical intervention?

. Microfracture
. Matrix-induced autologous chondrocyte implantation (MACI)
. Osteochondral autograft transfer system (OATS) using a single 8mm plug
. Unicompartmental knee arthroplasty
. High tibial osteotomy alone

Correct Answer & Explanation

. Microfracture


Explanation

MACI or osteochondral allograft transplantation are the preferred treatments for large chondral defects (>2-4 cm^2) in young, active patients. Microfracture and standard OATS are typically reserved for smaller lesions (<2 cm^2).

Question 4164

Topic: 5. Sports Medicine

A 14-year-old boy with open physes presents with knee pain. MRI reveals a 1.5 cm osteochondritis dissecans (OCD) lesion on the lateral aspect of the medial femoral condyle. The overlying articular cartilage is intact and there is no subchondral fluid line. What is the best initial treatment?

. Immediate arthroscopic surgical fixation
. Osteochondral autograft transfer
. Restricted weight-bearing and activity modification
. Diagnostic arthroscopy with antegrade drilling
. Microfracture

Correct Answer & Explanation

. Immediate arthroscopic surgical fixation


Explanation

In a skeletally immature patient with a stable OCD lesion (intact cartilage, no subchondral fluid on MRI), the initial treatment is nonoperative. A trial of activity modification and restricted weight-bearing allows for a high rate of spontaneous healing.

Question 4165

Topic: Knee Sports

A 20-year-old soccer player sustains a non-contact twisting knee injury. Radiographs show a small avulsion fracture of the anterolateral proximal tibia.

What is the most likely associated ligamentous injury, and what is its primary biomechanical function?

. Posterior cruciate ligament; resists posterior tibial translation
. Anterior cruciate ligament; resists anterior tibial translation
. Lateral collateral ligament; resists varus stress
. Medial collateral ligament; resists valgus stress
. Anterolateral ligament; resists isolated external rotation

Correct Answer & Explanation

. Posterior cruciate ligament; resists posterior tibial translation


Explanation

A Segond fracture is an avulsion of the anterolateral proximal tibia and is pathognomonic for an ACL tear. The primary function of the ACL is to resist anterior tibial translation.

Question 4166

Topic: Shoulder & Hip Sports

A 25-year-old professional baseball pitcher complains of posterior shoulder pain during the late cocking phase of throwing. Examination reveals a positive peel-back sign and increased external rotation with a deficit in internal rotation. What is the most likely diagnosis?

. Classic anterior instability
. Subcoracoid impingement
. Internal impingement with a type II SLAP tear
. Subacromial impingement
. Isolated subscapularis tear

Correct Answer & Explanation

. Classic anterior instability


Explanation

Pain in the late cocking phase with increased external rotation and a positive peel-back sign is classic for internal impingement. This condition is often associated with a type II SLAP tear due to the greater tuberosity abutting the posterosuperior glenoid.

Question 4167

Topic: Knee Sports

During an anterior cruciate ligament (ACL) reconstruction using an anteromedial portal technique, the surgeon aims to place the femoral tunnel in the anatomic footprint. Compared to the traditional transtibial technique, the anteromedial portal technique is associated with which of the following tunnel characteristics?

. A more vertical femoral tunnel
. A more anterior femoral tunnel
. Independent placement of the femoral tunnel relative to the tibial tunnel
. Decreased risk of posterior wall blowout
. Increased graft mismatch length inside the joint

Correct Answer & Explanation

. A more vertical femoral tunnel


Explanation

The anteromedial portal technique allows for independent drilling of the femoral tunnel, enabling a more anatomic, horizontal placement in the ACL footprint compared to the transtibial technique, which restricts femoral tunnel position based on the tibial tunnel trajectory.

Question 4168

Topic: Shoulder & Hip Sports

A 19-year-old collegiate hockey player presents with recurrent anterior shoulder instability. Preoperative evaluation determines an Instability Severity Index Score (ISIS) of 8. Which of the following surgical procedures is most appropriate to minimize his risk of recurrence?

. Arthroscopic Bankart repair with suture anchors
. Open Bankart repair with capsular shift
. Arthroscopic Bankart repair with remplissage
. Latarjet procedure (coracoid transfer)
. Arthroscopic superior labrum anterior-to-posterior (SLAP) repair

Correct Answer & Explanation

. Arthroscopic Bankart repair with suture anchors


Explanation

The Instability Severity Index Score (ISIS) identifies patients at high risk for recurrent instability after arthroscopic Bankart repair. A score >6 is an indication for a bone-block procedure, such as the Latarjet, to ensure adequate stability in high-risk contact athletes.

Question 4169

Topic: Knee Sports

A 24-year-old male sustains a traumatic knee injury. On physical examination, the dial test reveals 15 degrees of increased external rotation compared to the contralateral side at 30 degrees of knee flexion, but symmetrical external rotation at 90 degrees of knee flexion. What is the most likely diagnosis?

. Isolated posterolateral corner (PLC) injury
. Combined PLC and posterior cruciate ligament (PCL) injury
. Isolated PCL injury
. Combined anterior cruciate ligament (ACL) and PLC injury
. Medial collateral ligament (MCL) tear

Correct Answer & Explanation

. Isolated posterolateral corner (PLC) injury


Explanation

The dial test evaluates posterolateral rotatory instability. Increased external rotation (>10 degrees compared to the normal side) at 30 degrees only indicates an isolated PLC injury. Increased external rotation at both 30 and 90 degrees indicates a combined PLC and PCL injury.

Question 4170

Topic: Shoulder & Hip Sports

A 28-year-old professional baseball pitcher presents with posterior shoulder pain during the late cocking phase of throwing. Physical examination reveals a glenohumeral internal rotation deficit (GIRD) of 25 degrees. What is the primary pathophysiological mechanism contributing to this condition?

. Contracture of the posterior band of the inferior glenohumeral ligament
. Laxity of the anterior capsule
. Tear of the superior labrum
. Primary impingement of the rotator cuff against the acromion
. Weakness of the subscapularis muscle

Correct Answer & Explanation

. Contracture of the posterior band of the inferior glenohumeral ligament


Explanation

GIRD in throwing athletes is primarily caused by contracture of the posterior capsule, specifically the posterior band of the inferior glenohumeral ligament (IGHL). This alters glenohumeral kinematics, leading to superior and posterior translation of the humeral head during throwing and resulting in internal impingement.

Question 4171

Topic: Knee Sports

A 16-year-old female presents with recurrent lateral patellar dislocations. The decision is made to perform a medial patellofemoral ligament (MPFL) reconstruction. To prevent overloading the medial compartment and restricted knee flexion, the femoral attachment of the graft must be accurately placed. Where is the anatomic origin of the MPFL on the femur?

. Anterior to the medial epicondyle and proximal to the adductor tubercle
. Posterior to the medial epicondyle and distal to the adductor tubercle
. Between the medial epicondyle and the adductor tubercle
. At the posterior aspect of the medial femoral condyle articular cartilage
. Proximal to the adductor tubercle and anterior to the medial supracondylar line

Correct Answer & Explanation

. Anterior to the medial epicondyle and proximal to the adductor tubercle


Explanation

The anatomic femoral origin of the MPFL (often localized radiographically via Schottle's point) is situated in a saddle-shaped depression between the adductor tubercle (proximally) and the medial epicondyle (distally). Non-anatomic placement, particularly too proximal, leads to increased graft tension in flexion.

Question 4172

Topic: Shoulder & Hip Sports

A 55-year-old male presents with shoulder pain and weakness after a fall. On examination, he has a positive "bear-hug" test and increased external rotation compared to the contralateral side. Which structure is most likely injured?

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

Correct Answer & Explanation

. Supraspinatus tendon


Explanation

The bear-hug test, belly-press test, and lift-off test evaluate the subscapularis tendon. Increased passive external rotation is a classic finding of a full-thickness subscapularis tear due to the loss of the anterior restraint.

Question 4173

Topic: Knee Sports

A 14-year-old male presents with vaguely localized knee pain and occasional catching. Radiographs reveal an osteochondritis dissecans (OCD) lesion. What is the most common anatomical location for this lesion in the knee?

. Lateral aspect of the medial femoral condyle
. Medial aspect of the lateral femoral condyle
. Central weight-bearing dome of the medial femoral condyle
. Patellar articular surface
. Lateral aspect of the lateral femoral condyle

Correct Answer & Explanation

. Lateral aspect of the medial femoral condyle


Explanation

The most common location for an osteochondritis dissecans (OCD) lesion in the knee is the lateral aspect of the medial femoral condyle (classic location), accounting for approximately 70-80% of cases.

Question 4174

Topic: General Sports & Tendon

A 40-year-old water skier sustains a complete proximal hamstring avulsion. He undergoes acute surgical repair. During the surgical approach to the ischial tuberosity, which of the following neurovascular structures is at the highest risk of iatrogenic injury, particularly with retraction?

. Femoral nerve
. Obturator nerve
. Sciatic nerve
. Pudendal nerve
. Superior gluteal artery

Correct Answer & Explanation

. Femoral nerve


Explanation

The sciatic nerve lies just lateral to the ischial tuberosity and the proximal hamstring origin. It is at significant risk of injury during proximal hamstring repair, especially from vigorous retraction or scar tissue dissection in delayed cases.

Question 4175

Topic: 5. Sports Medicine

A 25-year-old professional tennis player presents with shoulder pain and weakness in external rotation. An MRI demonstrates a massive, irreparable posterosuperior rotator cuff tear with severe fatty infiltration. The patient has preserved forward elevation but a positive external rotation lag sign. Which tendon transfer is most appropriate to restore active external rotation?

. Pectoralis major transfer
. Latissimus dorsi transfer
. Lower trapezius transfer
. Serratus anterior transfer
. Subscapularis transfer

Correct Answer & Explanation

. Pectoralis major transfer


Explanation

The lower trapezius tendon transfer (often with an Achilles allograft) is highly effective for restoring active external rotation in patients with irreparable posterosuperior cuff tears. It has an in-phase line of pull that mimics the infraspinatus better than a latissimus dorsi transfer.

Question 4176

Topic: 5. Sports Medicine

A 22-year-old athlete sustains an isolated Grade II posterior cruciate ligament (PCL) injury. Which of the following non-operative rehabilitation strategies is most effective for promoting intrinsic ligament healing and restoring knee stability?

. Immobilization in a cylinder cast at 90 degrees of flexion for 4 weeks
. Early active hamstring strengthening and range of motion
. Immobilization in an anterior dynamic translation brace holding the knee in extension
. Immediate return to unrestricted athletic activities with a functional knee sleeve
. Continuous passive motion machine focusing on deep flexion

Correct Answer & Explanation

. Immobilization in a cylinder cast at 90 degrees of flexion for 4 weeks


Explanation

For acute isolated Grade I and II PCL tears, bracing the knee in extension or using a dynamic PCL brace applies an anterior directed force to the proximal tibia. This prevents posterior sag, allowing the PCL to heal in an anatomic, non-elongated position.

Question 4177

Topic: Knee Sports

A 25-year-old male sustains a direct blow to the proximal tibia with his knee flexed during a rugby match. On physical examination, he has a positive posterior drawer test. A dial test is performed, demonstrating greater than 10 degrees of increased external rotation compared to the contralateral knee at both 30 degrees and 90 degrees of flexion. What is the most likely diagnosis?

. Isolated posterolateral corner (PLC) injury
. Isolated posterior cruciate ligament (PCL) tear
. Combined PCL and posterolateral corner (PLC) injury
. Combined ACL and posterolateral corner (PLC) injury
. Combined ACL and PCL tear

Correct Answer & Explanation

. Isolated posterolateral corner (PLC) injury


Explanation

The dial test evaluates for excessive external rotation. Asymmetry of >10 degrees at 30 degrees of flexion only indicates an isolated PLC injury, whereas asymmetry at both 30 and 90 degrees of flexion indicates a combined PCL and PLC injury.

Question 4178

Topic: Shoulder & Hip Sports

A 22-year-old collegiate baseball pitcher presents with vague posterior shoulder pain during the late cocking phase of throwing. Examination reveals a 25-degree loss of internal rotation (GIRD) compared to the non-throwing shoulder. Which of the following is the primary pathoanatomy responsible for this clinical presentation?

. Contracture of the anterosuperior capsule
. Contracture of the posteroinferior capsule
. Attenuation of the coracohumeral ligament
. Partial articular-sided subscapularis tear
. Subcoracoid impingement

Correct Answer & Explanation

. Contracture of the anterosuperior capsule


Explanation

Glenohumeral internal rotation deficit (GIRD) in overhead athletes is primarily driven by contracture of the posteroinferior capsule. This tightness alters glenohumeral kinematics, leading to a posterosuperior shift of the humeral head during the throwing motion.

Question 4179

Topic: 5. Sports Medicine

An 18-year-old female soccer player undergoes primary anterior cruciate ligament (ACL) reconstruction. When comparing bone-patellar tendon-bone (BPTB) autograft to hamstring autograft, which of the following is a recognized disadvantage specific to the BPTB autograft?

. Higher rate of graft failure
. Increased incidence of anterior knee pain and kneeling pain
. Increased risk of deep venous thrombosis
. Higher incidence of postoperative saphenous neuritis
. Decreased objective knee stability on instrumented testing

Correct Answer & Explanation

. Higher rate of graft failure


Explanation

BPTB autografts have historically shown equivalent or slightly better objective stability compared to hamstring grafts but are consistently associated with a higher incidence of anterior knee pain and difficulty kneeling.

Question 4180

Topic: Shoulder & Hip Sports

A 21-year-old rugby player presents with recurrent anterior shoulder instability. A CT scan of the shoulder reveals an engaging Hill-Sachs lesion and a 25% anterior glenoid bone defect.

What is the most appropriate definitive surgical management?

. Arthroscopic anterior labral repair (Bankart)
. Arthroscopic remplissage alone
. Coracoid transfer procedure (Latarjet)
. Open capsular shift
. Subscapularis advancement

Correct Answer & Explanation

. Arthroscopic anterior labral repair (Bankart)


Explanation

In the setting of critical glenoid bone loss (typically >20-25%) and an engaging Hill-Sachs lesion, soft tissue stabilization (Bankart repair) has unacceptably high failure rates. A bony augmentation procedure like the Latarjet is the gold standard.