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Question 6881

Topic: Knee Sports

During knee flexion, which bundle of the Anterior Cruciate Ligament (ACL) is the primary restraint to anterior tibial translation?

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

Correct Answer & Explanation

. Anteromedial bundle


Explanation

The anteromedial (AM) bundle of the ACL is tight in flexion and acts as the primary restraint to anterior tibial translation at 90 degrees. The posterolateral (PL) bundle is tight in extension and provides rotational stability.

Question 6882

Topic: 5. Sports Medicine

Which of the following bone grafting materials possesses osteogenic, osteoinductive, and osteoconductive properties?

. Demineralized bone matrix (DBM)
. Cancellous allograft
. Iliac crest autograft
. Calcium phosphate cement
. Recombinant human BMP-2

Correct Answer & Explanation

. Iliac crest autograft


Explanation

Autograft (such as from the iliac crest) is the only graft material that provides all three properties: osteoconduction (scaffold), osteoinduction (growth factors), and osteogenesis (live cells). Allografts and DBM lack live cells, providing no osteogenesis.

Question 6883

Topic: 5. Sports Medicine

During the 'ligamentization' process of a bone-patellar tendon-bone autograft used for ACL reconstruction, at which postoperative time frame is the graft biomechanically at its weakest?

. 1-2 weeks
. 6-8 weeks
. 12-16 weeks
. 6 months
. 12 months

Correct Answer & Explanation

. 6-8 weeks


Explanation

The graft is weakest during the remodeling/necrotic phase, typically around 6-8 weeks postoperatively. During this time, the graft undergoes revascularization and cellular repopulation, significantly decreasing its structural properties.

Question 6884

Topic: 5. Sports Medicine

A professional football player sustains a severe hyperextension injury to his first metatarsophalangeal (MTP) joint (Turf toe). MRI confirms a complete tear of the plantar plate from the base of the proximal phalanx with proximal migration of the sesamoids (Grade 3). What is the most appropriate management?

. Rigid carbon-fiber shoe insert and return to play as tolerated
. Primary surgical repair of the plantar plate and flexor hallucis brevis
. First MTP arthrodesis
. Excision of the sesamoids and capsulorrhaphy
. Corticosteroid injection into the MTP joint and 2 weeks of strict rest

Correct Answer & Explanation

. Primary surgical repair of the plantar plate and flexor hallucis brevis


Explanation

Grade 3 turf toe involves a complete tear of the plantar plate and capsuloligamentous complex, often accompanied by proximal sesamoid migration. In high-demand athletes, non-operative management leads to chronic instability, weakness in push-off, and progressive deformity. Primary surgical repair of the plantar plate is indicated to restore joint stability and function.

Question 6885

Topic: 5. Sports Medicine

A 25-year-old female presents with chronic ankle pain after multiple sprains. MRI demonstrates a 2.0 cm squared osteochondral lesion of the medial talar dome with significant subchondral cystic changes. She has failed 6 months of conservative management. What is the most appropriate next step in surgical management?

. Arthroscopic bone marrow stimulation (microfracture) only
. Osteochondral autograft transfer (OATS) or structural allograft
. Ankle arthrodesis
. Total ankle arthroplasty
. Subchondral retrograde drilling without cartilage management

Correct Answer & Explanation

. Osteochondral autograft transfer (OATS) or structural allograft


Explanation

For larger osteochondral lesions of the talus (typically those >1.5 cm squared) or those associated with significant subchondral cystic changes, isolated microfracture (bone marrow stimulation) has a high failure rate. Structural restoration of the subchondral bone and articular cartilage with an osteochondral autograft transfer (OATS) or fresh osteochondral allograft is the recommended surgical treatment.

Question 6886

Topic: 5. Sports Medicine
A 28-year-old professional football player sustains an acute hyperextension injury to his first MTP joint. He exhibits significant ecchymosis, swelling, and an inability to bear weight. MRI confirms a complete tear of the plantar plate from the base of the proximal phalanx, with 5 mm of proximal retraction of the sesamoids compared to the contralateral side. What is the diagnosis and recommended management?
. Grade I turf toe; carbon fiber orthotic and immediate return to play
. Grade II turf toe; partial weight-bearing in a walking boot for 2 weeks
. Grade III turf toe; conservative management with figure-of-eight taping
. Grade III turf toe; surgical repair of the plantar plate complex
. Sesamoid fracture; excision of the fragmented sesamoid pole

Correct Answer & Explanation

. Grade III turf toe; surgical repair of the plantar plate complex


Explanation

The scenario describes a Grade III turf toe injury, which is a complete rupture of the plantar plate complex. Indications for surgical repair in turf toe injuries include a Grade III sprain with significant proximal retraction of the sesamoids (indicating complete disruption of the intrinsic stabilizing structures), intra-articular loose bodies, a displaced sesamoid fracture, or vertical instability of the joint. Surgical repair ensures the restoration of the anatomy and maximizes the athlete's chance of returning to elite-level sports.

Question 6887

Topic: 5. Sports Medicine

A 24-year-old football player sustains a severe hyperextension injury to his great toe. MRI reveals a complete rupture of the plantar plate with proximal retraction of the sesamoids. What is the most appropriate management?

. Taping the toe in plantarflexion and immediate return to play
. Stiff-soled shoe for 6 weeks followed by progressive activity
. Surgical repair of the plantar plate
. First MTP joint arthrodesis
. Excision of the proximal phalanx base

Correct Answer & Explanation

. Surgical repair of the plantar plate


Explanation

Grade 3 turf toe injuries (complete disruption of the plantar plate complex) with sesamoid retraction, severe instability, or intra-articular loose bodies typically require surgical repair. This is necessary to restore the push-off strength required in high-level athletes.

Question 6888

Topic: 5. Sports Medicine

A 20-year-old track athlete complains of vague, aching midfoot pain that worsens with sprinting. CT scan reveals an incomplete, non-displaced stress fracture in the central third of the tarsal navicular. What is the most appropriate initial treatment?

. Weight-bearing as tolerated in a controlled ankle motion (CAM) boot for 4 weeks
. Strict non-weight-bearing in a short leg cast for 6 to 8 weeks
. Immediate open reduction and internal fixation with a compression screw
. Pulsed electromagnetic field therapy and return to play
. Naviculocuneiform arthrodesis

Correct Answer & Explanation

. Strict non-weight-bearing in a short leg cast for 6 to 8 weeks


Explanation

The central third of the navicular is a hypovascular zone prone to delayed union. Non-displaced stress fractures are initially treated with strict non-weight-bearing in a cast for 6-8 weeks to optimize healing.

Question 6889

Topic: 5. Sports Medicine

A 26-year-old professional dancer presents with focal pain over the plantar aspect of the first metatarsophalangeal (MTP) joint after forceful hyperextension ('Turf Toe'). MRI reveals a complete tear of the plantar plate with proximal retraction of the sesamoids. What is the most appropriate management?

. Stiff-soled shoe with Morton's extension and full weight-bearing
. Non-weight-bearing cast for 6 weeks
. Corticosteroid injection followed by taping
. Primary arthrodesis of the first MTP joint
. Surgical repair of the plantar plate

Correct Answer & Explanation

. Surgical repair of the plantar plate


Explanation

Grade 3 turf toe injuries (complete tear of the plantar complex) with proximal migration of the sesamoids, clinical instability, or functional demands of an elite athlete typically warrant primary surgical repair.

Question 6890

Topic: 5. Sports Medicine

A 24-year-old professional football player sustains a severe hyperdorsiflexion injury to his great toe. Clinical exam shows gross instability of the first metatarsophalangeal (MTP) joint, and MRI confirms a complete rupture of the plantar plate with proximal retraction of the sesamoid complex. What is the most appropriate management?

. Stiff-soled shoe with a Morton extension
. Taping and immediate return to play with anti-inflammatories
. First MTP joint arthrodesis
. Primary surgical repair of the plantar plate
. Excision of the sesamoids

Correct Answer & Explanation

. Primary surgical repair of the plantar plate


Explanation

This describes a Grade 3 "turf toe" injury with frank instability and sesamoid retraction. In a competitive athlete, a complete tear of the plantar plate with gross instability or sesamoid retraction necessitates primary surgical repair to restore push-off strength and joint stability.

Question 6891

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

. Computed tomography (CT) scan of the neck


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 6892

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 6893

Topic: 5. Sports Medicine

A 22-year-old soccer player continues to experience a positive pivot shift test following a primary anterior cruciate ligament (ACL) reconstruction, despite normal sagittal plane stability. What surgical technical error during tunnel placement most commonly accounts for this residual rotational instability?

. Placement of the femoral tunnel too anteriorly
. Placement of the femoral tunnel too vertically (12 o'clock position)
. Placement of the tibial tunnel too posteriorly
. Placement of the tibial tunnel too anteriorly
. Use of a patellar tendon autograft instead of hamstring

Correct Answer & Explanation

. Placement of the femoral tunnel too vertically (12 o'clock position)


Explanation

Placing the femoral tunnel high in the intercondylar notch (the 12 o'clock position) creates a vertically oriented graft. While this controls anterior-posterior translation, it fails to adequately restore rotational stability, leaving a positive pivot shift.

Question 6894

Topic: Knee Sports

During a physical examination of the knee, the pivot shift test is performed to assess anterior cruciate ligament (ACL) integrity. The test primarily evaluates the function of which ACL bundle, and in what position does the tibia typically subluxate?

. Anteromedial bundle; the tibia subluxates in flexion
. Anteromedial bundle; the tibia subluxates in extension
. Posterolateral bundle; the tibia subluxates in flexion
. Posterolateral bundle; the tibia subluxates in extension
. Both bundles equally; the tibia subluxates in internal rotation

Correct Answer & Explanation

. Posterolateral bundle; the tibia subluxates in flexion


Explanation

The pivot shift test primarily assesses the rotatory stability provided by the posterolateral (PL) bundle of the ACL. During the test, the tibia subluxates anteriorly when the knee is in extension and reduces with a clunk as the knee flexes past 20-30 degrees.

Question 6895

Topic: Shoulder & Hip Sports

A 22-year-old rugby player presents with recurrent anterior shoulder instability. A 3D CT scan reveals 28% anterior glenoid bone loss. Which of the following surgical interventions is most appropriate to restore stability?

. Arthroscopic Bankart repair with capsular shift
. Open Bankart repair
. Arthroscopic Remplissage
. Coracoid transfer (Latarjet procedure)
. Putti-Platt procedure

Correct Answer & Explanation

. Coracoid transfer (Latarjet procedure)


Explanation

In the setting of significant anterior glenoid bone loss (typically >20-25%) in a collision athlete, soft tissue stabilization alone (Bankart repair) has an unacceptably high failure rate. A bony augmentation procedure, such as the Latarjet procedure, is the gold standard.

Question 6896

Topic: Knee Sports

During anterior cruciate ligament (ACL) reconstruction using a bone-patellar tendon-bone autograft, which of the following is the most common cause of early graft failure (within the first 6 months)?

. Immunologic graft rejection
. Traumatic re-rupture from high-energy impact
. Surgical technique errors (e.g., non-anatomic tunnel placement)
. Inadequate graft vascularization
. Deep joint infection

Correct Answer & Explanation

. Surgical technique errors (e.g., non-anatomic tunnel placement)


Explanation

The most common cause of early failure in ACL reconstruction is technical error, most notably non-anatomic tunnel placement. An anteriorly placed femoral tunnel, for instance, leads to excessive tension on the graft during flexion, causing stretching or premature rupture.

Question 6897

Topic: 5. Sports Medicine

Following a primary repair of the flexor digitorum profundus (FDP) and flexor digitorum superficialis (FDS) tendons in Zone II of the hand, what is the most common complication leading to a poor functional outcome?

. Tendon rupture
. Adhesion formation
. Deep space infection
. Lumbrical plus syndrome
. Quadriga effect

Correct Answer & Explanation

. Adhesion formation


Explanation

Zone II (often historically termed 'no man\'s land') contains the FDS and FDP tendons within the narrow fibro-osseous flexor sheath. The most common complication following repair in this zone is the formation of dense adhesions between the repaired tendons and the surrounding sheath, leading to digital stiffness and poor functional range of motion.

Question 6898

Topic: Shoulder & Hip Sports

A 22-year-old collegiate wrestler suffers recurrent anterior shoulder dislocations. Advanced imaging reveals an 'off-track' Hill-Sachs lesion and a 25% anterior glenoid bone loss. What is the most appropriate definitive surgical intervention?

. Arthroscopic Bankart repair alone
. Arthroscopic Bankart repair combined with remplissage
. Latarjet procedure (coracoid transfer)
. Open inferior capsular shift
. Proximal humerus derotational osteotomy

Correct Answer & Explanation

. Latarjet procedure (coracoid transfer)


Explanation

In the setting of significant anterior glenoid bone loss (typically > 20-25%) combined with an 'off-track' Hill-Sachs lesion, soft-tissue procedures (Bankart with or without remplissage) have an unacceptably high failure rate. Bony augmentation, most commonly the Latarjet procedure (transfer of the coracoid process with the attached conjoined tendon to the anterior glenoid), is the standard of care.

Question 6899

Topic: 5. Sports Medicine

During the remodeling phase (approximately 6 to 8 weeks postoperatively) of an anterior cruciate ligament (ACL) reconstruction using a soft tissue autograft, which part of the reconstruction is generally considered the weakest link?

. The intra-articular graft substance
. The tibial interference screw fixation
. The femoral suspensory fixation
. The native bone tunnels
. The musculotendinous junction

Correct Answer & Explanation

. The intra-articular graft substance


Explanation

While fixation sites are the weakest point in the early postoperative period (0-4 weeks), the intra-articular graft undergoes a stage of avascular necrosis and remodeling (ligamentization) around 6-8 weeks, making the graft substance itself the weakest link.

Question 6900

Topic: Knee Sports

A 22-year-old female soccer player sustains a non-contact pivoting injury to her right knee. Radiographs reveal a small elliptical avulsion fracture of the lateral tibial plateau just distal to the articular surface. This radiographic finding is pathognomonic for an injury to which of the following structures?

. Posterior cruciate ligament
. Anterior cruciate ligament
. Medial collateral ligament
. Posterolateral corner
. Iliotibial band

Correct Answer & Explanation

. Anterior cruciate ligament


Explanation

The described finding is a Segond fracture, which is an avulsion of the anterolateral capsule of the knee. It is considered a pathognomonic radiographic sign for an underlying anterior cruciate ligament (ACL) tear.