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Question 581

Topic: 5. Sports Medicine

A 22-year-old athlete undergoes anterior cruciate ligament (ACL) reconstruction using a bone-patellar tendon-bone (BPTB) autograft. Compared to hamstring autografts, what is the most common complication specifically associated with the BPTB graft type?

. Anterior knee pain
. Hamstring weakness
. Saphenous nerve injury
. Delayed graft incorporation
. Deep vein thrombosis

Correct Answer & Explanation

. Anterior knee pain


Explanation

Bone-patellar tendon-bone (BPTB) autografts provide excellent initial fixation and bone-to-bone healing. However, they are most frequently associated with donor site morbidity, particularly anterior knee pain and kneeling pain.

Question 582

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 583

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 584

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 585

Topic: 5. Sports Medicine

A 25-year-old female undergoes anterior cruciate ligament (ACL) reconstruction using a bone-patellar tendon-bone (BPTB) autograft. Which of the following is the most commonly reported complication associated with this specific graft choice when compared to hamstring autograft?

. Increased risk of graft rupture
. Anterior knee pain
. Hamstring weakness
. Increased risk of deep vein thrombosis
. Tunnel widening

Correct Answer & Explanation

. Anterior knee pain


Explanation

BPTB autografts are historically associated with a higher incidence of donor-site morbidity, specifically anterior knee pain and pain with kneeling, compared to hamstring autografts. Rates of graft rupture and stability are generally comparable or slightly favor BPTB.

Question 586

Topic: 5. Sports Medicine
The main 3-4 viewing portal for wrist arthroscopy lies in between which two tendons?
. Extensor pollicis longus (EPL) and extensor carpi radialis brevis (ECRB)
. Extensor digitorum communis (EDC) and extensor digiti minimi (EDM)
. Abductor pollicis longus (APL) and extensor carpi radialis longus (ECRL)
. EPL and EDC
. Extensor pollicis brevis (EPB) and APL

Correct Answer & Explanation

. EPL and EDC


Explanation

The 3-4 portal is the main viewing portal and is located between the third and fourth compartment. This portal is bordered by the extensor digitorum communis (EDC) to the index finger, and the extensor pollicis longus (EPL) can be palpated in the "soft spot" 1 cm distal to Lister's tubercle. This portal is usually the first portal to be made during wrist arthroscopy.

Question 587

Topic: 5. Sports Medicine

C omplications after wrist arthroscopy occur in what percentage of patients:

. 5%
. 10%
. 15%
. 20%
. 25%

Correct Answer & Explanation

. 5%


Explanation

The complication rate after routine wrist arthroscopy is between 2% and 5%.

Question 588

Topic: 5. Sports Medicine

A 24-year-old athlete undergoes posterior cruciate ligament (PCL) reconstruction. The surgeon must understand the biomechanics of the PCL's two primary bundles. Which bundle is most taut in knee flexion?

. Anterolateral bundle
. Posteromedial bundle
. Anteromedial bundle
. Posterolateral bundle
. Meniscofemoral ligament

Correct Answer & Explanation

. Anterolateral bundle


Explanation

The PCL is composed of two main bundles: the anterolateral (AL) and posteromedial (PM) bundles. The larger AL bundle is taut in flexion and lax in extension, whereas the PM bundle is taut in extension.

Question 589

Topic: Knee Sports

In an anterior cruciate ligament (ACL) reconstruction, positioning the femoral tunnel is critical for restoring rotational stability. For a right knee, placing the tunnel at which clock face position optimally mimics the native anatomical footprint?

. 10 o'clock
. 12 o'clock
. 2 o'clock
. 8 o'clock
. 6 o'clock

Correct Answer & Explanation

. 10 o'clock


Explanation

For a right knee, placing the femoral tunnel at the 10 o'clock position (or 2 o'clock for a left knee) optimally addresses the native ACL footprint. Vertical placement at 12 o'clock restores AP stability but fails to control rotational translation.

Question 590

Topic: 5. Sports Medicine

A 24-year-old athlete undergoes a posterolateral corner (PLC) reconstruction of the knee utilizing a fibular-based technique. The surgeon isolates a nerve that winds posterior to the biceps femoris tendon. A motor deficit resulting from injury to this specific nerve would manifest primarily as weakness in which muscle?

. Tibialis posterior
. Flexor hallucis longus
. Tibialis anterior
. Gastrocnemius
. Plantaris

Correct Answer & Explanation

. Tibialis anterior


Explanation

The common peroneal nerve lies posterior to the biceps femoris tendon and wraps around the fibular neck. Injury to it affects the deep peroneal nerve, leading to weakness in the tibialis anterior and resulting in foot drop.

Question 591

Topic: 5. Sports Medicine

A 29-year-old man with a remote history of wrist trauma and chronic pain presents with a palpable clunk on radio-ulnar deviation of the wrist. The most sensitive technique for identifying a scapholunate injury is:

. Plain radiographs
. Magnetic resonance image (MRI)
. Dynamic cineradiography
. Bone scan
. Arthroscopy

Correct Answer & Explanation

. Arthroscopy


Explanation

Magnetic resonance imaging is commonly used among patients with concern for ligamentous injuries of the wrist, particularly in the presence of an abnormal physical exam when plain radiographs are normal. However, the sensitivity of MRI has been shown to be less than 40% in comparison with arthroscopy. Arthroscopy has become the gold standard for the diagnosis of ligamentous injuries to the wrist. A classification scheme has been proposed based on both radiocarpal and midcarpal arthroscopic findings.

Question 592

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 593

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 594

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 595

Topic: 5. Sports Medicine

A 25-year-old overhead athlete presents with deep shoulder pain. MR arthrogram reveals a type II SLAP tear. During arthroscopy, a "peel-back" lesion is noted. This mechanism primarily involves which force applied to the biceps anchor during the late cocking phase of throwing?

. Compression
. Torsional
. Shearing
. Distraction
. Bending

Correct Answer & Explanation

. Torsional


Explanation

The "peel-back" mechanism occurs during the late cocking phase of throwing when the shoulder is maximally abducted and externally rotated. This places a torsional force on the biceps root, causing it to peel back from the posterior superior glenoid.

Question 596

Topic: 5. Sports Medicine

When comparing bone-patellar tendon-bone (BPTB) autograft to hamstring autograft for anterior cruciate ligament (ACL) reconstruction, which of the following is a recognized disadvantage of the BPTB graft?

. Higher rate of graft rupture
. Slower biological incorporation into the bone tunnels
. Increased incidence of anterior knee pain
. Weaker initial fixation strength
. Higher risk of postoperative saphenous nerve neuritis

Correct Answer & Explanation

. Increased incidence of anterior knee pain


Explanation

A primary disadvantage of the BPTB autograft is donor site morbidity, particularly anterior knee pain and pain with kneeling. BPTB offers excellent initial fixation and faster bone-to-bone healing compared to soft tissue grafts.

Question 597

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 598

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 599

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 600

Topic: 5. Sports Medicine

In cases of subacute scaphoid-lunate ligament injury with no arthrosis, all of the following are acceptable options except:

. Herbert screw (reduction association of the scapholunate)
. Scaphotrapeziotrapezoid (STT) fusion
. Scaphoid-lunate ligament reconstruction using bone-ligament-bone autograft
. Allograft ligament
. Repair with capsulodesis

Correct Answer & Explanation

. Scaphotrapeziotrapezoid (STT) fusion


Explanation

In cases of subacute scaphoid-lunate ligament injury without arthrosis, it is acceptable to attempt reconstruction with bone anchors, allograft ligament repair, capsulodesis, bone-ligament-bone autograft, and the RASL procedure with a Herbert screw. In the presence of localized arthritis, one might consider one of the limited wrist fusions such as scaphotrapeziotrapezoid fusion.