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Question 5281

Topic: Shoulder & Hip Sports

A 28-year-old volleyball player presents with insidious onset of posterior shoulder pain and weakness. Examination reveals isolated external rotation weakness with the arm at the side and visible atrophy of the infraspinatus. Supraspinatus strength is normal. Where is the most likely site of nerve compression?

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

Correct Answer & Explanation

. Spinoglenoid notch


Explanation

Compression of the suprascapular nerve at the spinoglenoid notch affects only the motor branch to the infraspinatus. This leads to isolated weakness in external rotation and infraspinatus atrophy.

Question 5282

Topic: 5. Sports Medicine

During anterior ankle arthroscopy, the anterocentral portal is generally avoided due to the high risk of injury to which of the following structures?

. Superficial peroneal nerve
. Deep peroneal nerve and dorsalis pedis artery
. Sural nerve and small saphenous vein
. Saphenous nerve and great saphenous vein
. Tibial nerve and posterior tibial artery

Correct Answer & Explanation

. Deep peroneal nerve and dorsalis pedis artery


Explanation

The anterocentral portal places the deep peroneal nerve and the dorsalis pedis artery at direct risk. Consequently, standard anterior arthroscopy utilizes anteromedial and anterolateral portals instead.

Question 5283

Topic: 5. Sports Medicine

A 25-year-old overhead athlete presents with vague posterior shoulder pain and numbness over the lateral deltoid. MRI confirms isolated atrophy of the teres minor. Compression of the axillary nerve in the quadrilateral space is suspected. Which of the following anatomical structures forms the superior border of this space?

. Teres major
. Long head of the triceps
. Teres minor
. Surgical neck of the humerus
. Subscapularis

Correct Answer & Explanation

. Surgical neck of the humerus


Explanation

The quadrilateral space is bordered by the teres minor superiorly, teres major inferiorly, long head of the triceps medially, and humerus laterally. It contains the axillary nerve and the posterior circumflex humeral artery.

Question 5284

Topic: Knee Sports

During an anatomic reconstruction of the posterolateral corner (PLC) of the knee, accurate tunnel placement is essential. On which specific portion of the fibula does the popliteofibular ligament primarily attach?

. Anterior aspect of the fibular head
. Posteromedial aspect of the fibular styloid
. Lateral aspect of the fibular neck
. Posterolateral aspect of the fibular styloid
. Anteromedial aspect of the fibular head

Correct Answer & Explanation

. Posteromedial aspect of the fibular styloid


Explanation

The popliteofibular ligament arises from the popliteus musculotendinous junction and inserts on the posteromedial down-slope of the fibular styloid. It acts as a critical static stabilizer against posterolateral rotation.

Question 5285

Topic: 5. Sports Medicine

To safely establish a standard anterior portal during shoulder arthroscopy, a surgeon targets the rotator interval to minimize neurovascular injury. This anatomical interval is bounded superiorly by the anterior margin of the supraspinatus and inferiorly by which structure?

. Coracohumeral ligament
. Superior margin of the subscapularis
. Long head of the biceps tendon
. Middle glenohumeral ligament
. Inferior glenohumeral ligament

Correct Answer & Explanation

. Superior margin of the subscapularis


Explanation

The rotator interval is a triangular space bounded superiorly by the anterior edge of the supraspinatus, inferiorly by the superior border of the subscapularis, and medially by the base of the coracoid process. It serves as a relatively safe zone for anterior portal placement.

Question 5286

Topic: Knee Sports

When performing a surgical reconstruction of the posterolateral corner (PLC) of the knee, the femoral footprint of the lateral collateral ligament (LCL) is located in which relation to the lateral epicondyle?

. Proximal and posterior
. Distal and anterior
. Directly on the epicondyle
. Proximal and anterior
. Distal and posterior

Correct Answer & Explanation

. Proximal and posterior


Explanation

The femoral attachment of the LCL is situated slightly proximal and posterior to the lateral femoral epicondyle. In contrast, the popliteus tendon inserts distal and anterior to the LCL attachment on the lateral femur.

Question 5287

Topic: Shoulder & Hip Sports

A patient presents with weakness in shoulder abduction and external rotation following a traction injury. EMG reveals denervation isolated to the supraspinatus and infraspinatus muscles. Which of the following anatomic landmarks is the most frequent site of compression?

. Spinoglenoid notch
. Suprascapular notch
. Quadrilateral space
. Triangular interval
. Coracoid process

Correct Answer & Explanation

. Suprascapular notch


Explanation

The suprascapular nerve innervates both the supraspinatus and infraspinatus muscles and is most commonly compressed at the suprascapular notch beneath the superior transverse scapular ligament. Entrapment further distally at the spinoglenoid notch would typically spare the supraspinatus and isolate weakness to the infraspinatus.

Question 5288

Topic: Shoulder & Hip Sports

A 26-year-old professional baseball pitcher presents with isolated, painless weakness in external rotation of his throwing shoulder. Magnetic resonance imaging demonstrates isolated atrophy of the infraspinatus muscle. At which of the following anatomical locations is the affected nerve most likely compressed?

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

Correct Answer & Explanation

. Spinoglenoid notch


Explanation

Compression of the suprascapular nerve at the spinoglenoid notch affects only the infraspinatus, presenting with painless weakness in external rotation. Compression at the suprascapular notch would affect both the supraspinatus and infraspinatus.

Question 5289

Topic: Shoulder & Hip Sports

A 34-year-old professional volleyball player presents with insidious onset of right shoulder weakness. Examination reveals isolated atrophy of the infraspinatus with normal supraspinatus bulk and strength. Where is the most likely site of nerve compression?

. Quadrilateral space
. Spinoglenoid notch
. Suprascapular notch
. Triangular interval
. Coracoid process

Correct Answer & Explanation

. Spinoglenoid notch


Explanation

Compression of the suprascapular nerve at the spinoglenoid notch results in isolated infraspinatus weakness and atrophy. Compression at the suprascapular notch would affect both the supraspinatus and infraspinatus.

Question 5290

Topic: Shoulder & Hip Sports

A 25-year-old man sustains a severe traction injury to his shoulder, resulting in a disruption of the posterior cord of the brachial plexus. Which of the following muscles will most likely demonstrate profound weakness on clinical examination?

. Pectoralis major
. Latissimus dorsi
. Biceps brachii
. Flexor carpi ulnaris
. Supraspinatus

Correct Answer & Explanation

. Latissimus dorsi


Explanation

The latissimus dorsi is innervated by the thoracodorsal nerve, which arises from the posterior cord. The pectoralis major (medial/lateral cords), biceps (lateral cord), flexor carpi ulnaris (medial cord), and supraspinatus (upper trunk) do not receive primary innervation from the posterior cord.

Question 5291

Topic: Shoulder & Hip Sports

A 28-year-old elite volleyball player presents with isolated weakness of external rotation in his dominant shoulder. MRI reveals a paralabral cyst in the spinoglenoid notch. Which nerve is compressed, and which muscle(s) will demonstrate denervation changes?

. Suprascapular nerve; supraspinatus and infraspinatus
. Suprascapular nerve; infraspinatus only
. Axillary nerve; teres minor
. Dorsal scapular nerve; rhomboids
. Radial nerve; triceps

Correct Answer & Explanation

. Suprascapular nerve; infraspinatus only


Explanation

The suprascapular nerve passes through the suprascapular notch to innervate the supraspinatus, then travels through the spinoglenoid notch to innervate the infraspinatus. Compression at the spinoglenoid notch causes isolated infraspinatus weakness.

Question 5292

Topic: Knee Sports

A 22-year-old football player sustains a direct blow to the anteromedial tibia. Clinical examination demonstrates asymmetric varus laxity at 30 degrees of knee flexion, but symmetrical stability at 0 degrees. Which of the following structures is the primary restraint to varus opening at 30 degrees of flexion?

. Popliteofibular ligament
. Anterior cruciate ligament
. Lateral collateral ligament
. Posterolateral capsule
. Iliotibial band

Correct Answer & Explanation

. Lateral collateral ligament


Explanation

The lateral collateral ligament (LCL) is the primary restraint to varus stress at 30 degrees of knee flexion. At full extension (0 degrees), the posterior cruciate ligament and posterolateral capsule act as secondary restraints, masking an isolated LCL injury.

Question 5293

Topic: Knee Sports

During a posterolateral corner (PLC) reconstruction of the knee, the surgeon must anatomically restore the femoral footprints of the lateral collateral ligament (LCL) and the popliteus tendon. What is the spatial relationship of the LCL origin relative to the popliteus origin on the lateral femoral condyle?

. Distal and anterior
. Distal and posterior
. Proximal and anterior
. Proximal and posterior
. Directly medial

Correct Answer & Explanation

. Proximal and posterior


Explanation

On the lateral femoral condyle, the origin of the LCL is situated proximal and posterior to the popliteus insertion. Recognizing this relationship is critical for isometric graft placement during PLC reconstruction.

Question 5294

Topic: Shoulder & Hip Sports

A 28-year-old volleyball player presents with isolated weakness in external rotation of the shoulder with the arm at the side, but has normal abduction strength and no sensory deficits. An MRI reveals a paralabral cyst in the spinoglenoid notch. From which structural level of the brachial plexus does the affected nerve originate?

. C5 and C6 nerve roots directly
. Upper trunk
. Middle trunk
. Lateral cord
. Posterior cord

Correct Answer & Explanation

. Upper trunk


Explanation

The suprascapular nerve originates from the upper trunk of the brachial plexus (C5, C6). Compression at the spinoglenoid notch affects only the infraspinatus muscle, leading to isolated external rotation weakness.

Question 5295

Topic: Knee Sports

During a posterolateral corner (PLC) reconstruction of the knee, anatomic femoral tunnels must be created. What is the correct position of the popliteus tendon femoral insertion relative to the lateral collateral ligament (LCL) origin?

. Posterior and proximal
. Anterior and proximal
. Anterior and inferior
. Posterior and inferior
. Directly deep to the LCL origin

Correct Answer & Explanation

. Anterior and inferior


Explanation

The popliteus tendon originates on the lateral femoral epicondyle an average of 18.5 mm anterior and inferior to the origin of the lateral collateral ligament (LCL). Recognizing this relationship is crucial for anatomic PLC reconstructions.

Question 5296

Topic: Knee Sports

A 35-year-old patient requires reconstruction of the posterolateral corner of the knee following a multiligamentous knee injury. Accurate anatomical tunnel placement is critical to restore proper joint kinematics. Relative to the lateral epicondyle, where is the normal anatomic femoral attachment of the fibular collateral ligament (FCL) located?

. Proximal and posterior
. Proximal and anterior
. Distal and posterior
. Distal and anterior
. Directly on the articular margin

Correct Answer & Explanation

. Proximal and posterior


Explanation

The anatomic femoral attachment of the fibular collateral ligament (FCL) is located slightly proximal and posterior to the lateral epicondyle. Placing the femoral tunnel incorrectly alters tensioning across the flexion-extension arc.

Question 5297

Topic: Shoulder & Hip Sports

During a Latarjet procedure for recurrent anterior shoulder instability, the conjoined tendon is mobilized and retracted to gain exposure to the anterior glenoid. The surgeon must be mindful of the musculocutaneous nerve entering the coracobrachialis muscle. What is the typical distance from the tip of the coracoid process to the point where this nerve enters the muscle?

. 1-3 cm
. 5-8 cm
. 10-12 cm
. 13-15 cm
. It does not enter the coracobrachialis

Correct Answer & Explanation

. 5-8 cm


Explanation

The musculocutaneous nerve typically enters the coracobrachialis muscle 5 to 8 cm distal to the tip of the coracoid process. Vigorous retraction of the conjoined tendon past this limit can cause a stretch injury to the nerve.

Question 5298

Topic: Shoulder & Hip Sports

A professional volleyball player presents with isolated weakness of the infraspinatus muscle. MRI reveals a ganglion cyst compressing a nerve at the spinoglenoid notch. Which ligament forms the roof of this notch?

. Coracoacromial ligament
. Superior transverse scapular ligament
. Spinoglenoid ligament
. Coracohumeral ligament
. Superior glenohumeral ligament

Correct Answer & Explanation

. Spinoglenoid ligament


Explanation

The suprascapular nerve passes through the spinoglenoid notch, where it is roofed by the spinoglenoid ligament (inferior transverse scapular ligament). Entrapment here causes isolated infraspinatus weakness, sparring the supraspinatus.

Question 5299

Topic: Knee Sports

During surgical reconstruction of the posterolateral corner (PLC) of the knee, understanding the layered anatomy is essential. Which of the following structures are located in the superficial layer (Layer 1) of the lateral side of the knee?

. Lateral collateral ligament
. Biceps femoris and iliotibial band
. Popliteus tendon
. Popliteofibular ligament
. Fabellofibular ligament

Correct Answer & Explanation

. Biceps femoris and iliotibial band


Explanation

According to Seebacher's anatomical classification, the lateral aspect of the knee has three layers. Layer 1 (superficial) consists of the iliotibial band and the biceps femoris.

Question 5300

Topic: Shoulder & Hip Sports

A patient presents with isolated weakness of external rotation of the shoulder with preserved abduction. At which of the following anatomical locations is nerve entrapment most likely occurring?

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

Correct Answer & Explanation

. Spinoglenoid notch


Explanation

Entrapment of the suprascapular nerve at the spinoglenoid notch affects only the infraspinatus muscle, leading to isolated external rotation weakness. Entrapment at the suprascapular notch affects both the supraspinatus and infraspinatus.