Section 1: Exam Mode (Questions Only)
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A 45-year-old male sustains a pronation-external rotation ankle injury. Radiographs reveal a spiral fracture of the fibula extending 6 cm proximal to the syndesmosis, a shallow posterior malleolar fragment, and an intact medial malleolus. The medial clear space is widened to 6 mm on stress views. Which of the following is the most appropriate management?
A. Short leg non-weight-bearing cast for 6 weeks
B. Open reduction and internal fixation (ORIF) of the fibula alone
C. ORIF of the fibula and assessment/repair of the deltoid ligament
D. ORIF of the fibula, syndesmotic fixation, and assessment of the posterior malleolus
E. Primary total ankle arthroplasty -
A 62-year-old diabetic patient presents with a rapidly progressive, warm, swollen, and erythematous left foot with rocker-bottom deformity. Radiographs show extensive disorganization of the midfoot joints, fragmentation, and osteolysis, but no acute fracture line or dislocation. The skin is intact. What is the most appropriate immediate management?
A. Urgent surgical debridement and intravenous antibiotics
B. Non-weight-bearing total contact cast (TCC) application
C. Immediate referral for revascularization assessment
D. Open reduction and internal fixation of the midfoot joints
E. Serial aspiration and steroid injection -
A 30-year-old professional athlete suffers an acute Achilles tendon rupture. Physical examination reveals a palpable gap 4 cm proximal to the calcaneal insertion and a positive Thompson test. He desires the quickest return to high-level sports. Which treatment option is most appropriate?
A. Non-weight-bearing cast immobilization for 8 weeks
B. Percutaneous repair with early mobilization
C. Open repair with augmented reconstruction
D. Functional bracing with progressive weight-bearing
E. Platelet-rich plasma (PRP) injection with cast immobilization -
Regarding a Hawkins Type III talar neck fracture, which of the following statements is most accurate?
A. It involves a displaced talar neck fracture with subtalar dislocation but no tibiotalar dislocation.
B. It carries the lowest risk of avascular necrosis among Hawkins classifications.
C. Urgent open reduction and internal fixation is indicated to minimize the risk of avascular necrosis.
D. Non-operative management with cast immobilization is often successful due to the robust blood supply.
E. It typically results from low-energy inversion injuries. -
A 55-year-old obese female presents with a progressive painful flatfoot deformity. Examination reveals a flexible planovalgus foot with hindfoot valgus, forefoot abduction, a "too many toes" sign, and inability to perform a single heel raise. Resisted inversion is weak. Which stage of posterior tibial tendon dysfunction (PTTD) does this describe?
A. Stage I
B. Stage IIa
C. Stage IIb
D. Stage III
E. Stage IV -
A 28-year-old ballet dancer complains of chronic pain in the posterior ankle, exacerbated by pointe work and forced plantarflexion. Imaging reveals an enlarged posterior process of the talus. Which structure is most likely impinged?
A. Tibialis anterior tendon
B. Flexor hallucis longus tendon
C. Peroneus brevis tendon
D. Posterior tibial nerve
E. Sural nerve -
Which of the following describes the correct order of fusion for a triple arthrodesis?
A. Talonavicular, Calcaneocuboid, Subtalar
B. Subtalar, Talonavicular, Calcaneocuboid
C. Calcaneocuboid, Subtalar, Talonavicular
D. Talonavicular, Subtalar, Calcaneocuboid
E. Subtalar, Calcaneocuboid, Talonavicular -
A patient presents with a displaced intra-articular calcaneal fracture. Which imaging modality is most critical for surgical planning and assessing subtalar joint involvement?
A. Weight-bearing radiographs
B. MRI with gadolinium
C. CT scan with 3D reconstructions
D. Bone scintigraphy
E. Ultrasound -
A 10-year-old child presents with a rigid, painful flatfoot. X-rays show a "C-sign" on the lateral view and an indistinct middle facet of the subtalar joint. What is the most likely diagnosis?
A. Congenital vertical talus
B. Flexible pes planovalgus
C. Accessory navicular syndrome
D. Calcaneonavicular coalition
E. Talocalcaneal coalition -
A 40-year-old male presents with chronic lateral ankle pain and instability after multiple inversion sprains. Brostrom-Gould repair is planned. Which ligament is primarily reinforced or imbricated in this procedure?
A. Anterior inferior tibiofibular ligament
B. Posterior talofibular ligament
C. Calcaneofibular ligament
D. Anterior talofibular ligament
E. Deltoid ligament -
What is the primary advantage of a Lapidus procedure (first metatarsocuneiform fusion) for hallux valgus deformity over a distal osteotomy (e.g., Chevron)?
A. Allows for immediate full weight-bearing
B. Addresses a large intermetatarsal angle and corrects frontal plane deformity
C. Results in a quicker return to sports activities
D. Has a lower risk of malunion
E. Preserves motion at the first metatarsocuneiform joint -
A patient undergoes an open reduction and internal fixation of a severe pilon fracture. Postoperatively, they develop a steppage gait and numbness over the dorsum of the foot, sparing the first web space. Which nerve injury is most likely?
A. Tibial nerve
B. Sural nerve
C. Superficial peroneal nerve
D. Deep peroneal nerve
E. Saphenous nerve -
Which of the following conditions is most likely to be associated with an equinus contracture of the ankle?
A. Hallux rigidus
B. Calcaneal stress fracture
C. Plantar fasciitis
D. Morton's neuroma
E. Tarsal tunnel syndrome -
A 60-year-old patient with end-stage primary ankle osteoarthritis is being considered for surgical intervention. Which factor is a relative contraindication to total ankle arthroplasty (TAA) but less so for ankle arthrodesis?
A. Significant ankle varus deformity (>15 degrees)
B. Morbid obesity (BMI >40)
C. Active infection in the joint
D. Avascular necrosis of the talus
E. Severe subtalar arthritis -
A patient presents with acute onset of severe pain, swelling, and erythema of the first metatarsophalangeal (MTP) joint. Synovial fluid analysis reveals negatively birefringent urate crystals. What is the most appropriate long-term management strategy for this condition?
A. Chronic NSAID use
B. Intra-articular steroid injections every 3 months
C. Urate-lowering therapy (e.g., allopurinol) once acute inflammation subsides
D. Urgent surgical debridement of the MTP joint
E. Immobilization with a walking boot indefinitely -
Which of the following is considered the most common type of traumatic Lisfranc injury?
A. Homolateral
B. Divergent
C. Partial
D. Isolated
E. Combined homolateral and divergent -
A 35-year-old male presents with chronic pain and swelling over the lateral aspect of his ankle, exacerbated by activity. Examination reveals tenderness over the distal fibula and a palpable "snapping" with active dorsiflexion and eversion. What is the most likely diagnosis?
A. Peroneus brevis tendinopathy
B. Peroneal tendon subluxation/dislocation
C. Chronic lateral ankle instability
D. Anterior inferior tibiofibular ligament injury
E. Osteochondral lesion of the talus -
In the evaluation of a patient with suspected tarsal tunnel syndrome, which of the following physical examination findings is most specific?
A. Positive Homan's sign
B. Positive Tinel's sign posterior to the medial malleolus
C. Absent pedal pulses
D. Weakness of ankle dorsiflexion
E. Loss of sensation over the dorsum of the foot -
Which imaging modality is considered the gold standard for diagnosing a navicular stress fracture that is not visible on plain radiographs?
A. CT scan
B. MRI
C. Bone scan
D. Ultrasound
E. PET scan -
A 7-year-old child presents with a progressive, painless, rigid flatfoot deformity and a palpable prominence on the medial aspect of the foot. Lateral radiographs show a 'nutcracker' deformity where the talar head appears impinged. Which condition is most likely?
A. Flexible pes planovalgus
B. Congenital vertical talus
C. Tarsal coalition
D. Accessory navicular
E. Charcot-Marie-Tooth disease -
What is the primary blood supply to the talus, making it susceptible to avascular necrosis following certain fracture patterns?
A. Posterior tibial artery branches
B. Peroneal artery branches
C. Dorsalis pedis artery branches
D. Anastomotic network from anterior tibial, posterior tibial, and peroneal arteries
E. Medial calcaneal artery -
A patient with a displaced intra-articular calcaneal fracture (Sanders Type IIB) is planned for operative management. Which of the following is a common approach for fixation of such fractures?
A. Direct anterior approach
B. Posteromedial approach
C. Lateral extensile approach
D. Medial approach
E. Dorsal approach -
Which of the following is a key component of the spring ligament complex, crucial for supporting the medial longitudinal arch?
A. Calcaneofibular ligament
B. Bifurcate ligament
C. Plantar calcaneonavicular ligament
D. Long plantar ligament
E. Short plantar ligament -
A 68-year-old patient with severe hallux rigidus (Grade IV) reports significant pain and limited MTP joint motion. They are a low-demand individual. What is the most appropriate surgical option?
A. Cheilectomy
B. MTP joint fusion
C. MTP joint hemiarthroplasty
D. MTP joint total arthroplasty
E. Metatarsal shortening osteotomy -
What is the primary deforming force responsible for the development of claw toes?
A. Weakness of the interossei muscles
B. Overactivity of the extensor digitorum longus
C. Overactivity of the flexor digitorum longus
D. Weakness of the intrinsic foot muscles and overactivity of the extrinsic muscles
E. Plantar plate rupture -
A 25-year-old male sustains a high-energy trauma resulting in a calcaneal fracture. He develops severe pain, paresthesias, and weakness of toe flexion. Examination reveals a tense plantar foot compartment. What is the most appropriate immediate management?
A. Urgent CT angiography
B. Close observation and analgesia
C. Emergent four-compartment fasciotomy of the foot
D. Elevation and ice application
E. Cast immobilization -
Which nerve is most at risk during a standard anterolateral approach to the ankle for osteochondral lesion debridement?
A. Sural nerve
B. Saphenous nerve
C. Deep peroneal nerve
D. Superficial peroneal nerve
E. Tibial nerve -
A patient presents with a chronic ulcer on the plantar aspect of the first metatarsal head. They have a history of diabetes mellitus and palpable pulses. What is the initial priority in the management of this ulcer?
A. Surgical revascularization
B. Systemic antibiotic therapy
C. Aggressive surgical debridement
D. Offloading of the affected area
E. Daily wound packing with antiseptics -
A 40-year-old active runner develops chronic pain and tenderness along the posteromedial aspect of the ankle. Imaging shows thickening and signal changes within the flexor hallucis longus (FHL) tendon sheath. What is the most likely diagnosis?
A. Achilles tendinopathy
B. Posterior tibial tendon dysfunction
C. FHL tendinopathy (dancer's tendinitis)
D. Tarsal tunnel syndrome
E. Peroneal tendinopathy -
Which of the following statements regarding a Jones fracture (fracture at the metadiaphyseal junction of the fifth metatarsal) is true?
A. It has a high rate of union with conservative management.
B. It occurs within the watershed area, predisposing to non-union.
C. It typically results from an avulsion injury of the peroneus brevis.
D. It is best managed with a walking boot and early weight-bearing.
E. Surgical intervention is rarely indicated. -
What is the most common direction of a traumatic ankle dislocation without associated fracture?
A. Anterior
B. Posterior
C. Medial
D. Lateral
E. Superior -
In the assessment of an adult acquired flatfoot deformity, which surgical procedure aims to correct hindfoot valgus and relieve tension on the medial soft tissues?
A. Evans calcaneal osteotomy
B. Dwyer calcaneal osteotomy
C. Lateral column lengthening (e.g., using a calcaneal osteotomy with graft)
D. Medializing calcaneal osteotomy
E. Cotton osteotomy (dorsal opening wedge medial cuneiform osteotomy) -
Which of the following is the most sensitive imaging modality for detecting early osteochondral lesions of the talus (OLT)?
A. Plain radiographs
B. CT scan
C. MRI
D. Bone scan
E. Ultrasound -
A patient presents with a history of recurrent ankle sprains and complaints of the ankle "giving way" on uneven ground. Clinical examination confirms chronic lateral ankle instability. Which modified Brostrom-Gould procedure involves imbrication of the anterior talofibular ligament and calcaneofibular ligament, augmented by a flap of the inferior extensor retinaculum?
A. Brostrom original
B. Brostrom-Gould
C. Watson-Jones
D. Chrisman-Snook
E. Allograft reconstruction -
What is the primary role of the tibialis anterior muscle in foot and ankle biomechanics?
A. Ankle plantarflexion and inversion
B. Ankle dorsiflexion and inversion
C. Ankle eversion and plantarflexion
D. Ankle dorsiflexion and eversion
E. Toe extension -
Which of the following is a common early complication of total ankle arthroplasty (TAA)?
A. Component subsidence
B. Deep infection
C. Avascular necrosis of the talus
D. Stiffness
E. Neuroma formation -
A 6-month-old infant is diagnosed with idiopathic congenital talipes equinovarus (clubfoot). According to the Ponseti method, what is the initial step in treatment?
A. Immediate surgical correction
B. Serial manipulation and long leg casting with specific correction principles
C. Application of a foot abduction brace
D. Percutaneous Achilles tenotomy
E. Stretching exercises by parents -
A patient with severe hallux rigidus undergoes a cheilectomy. What is the primary goal of this procedure?
A. To fuse the first MTP joint
B. To decompress the first MTP joint and improve dorsiflexion
C. To shorten the first metatarsal
D. To excise the sesamoids
E. To correct hallux valgus deformity -
Which of the following ankle fracture classifications primarily describes the level of the fibular fracture in relation to the syndesmosis?
A. Lauge-Hansen
B. Danis-Weber
C. AO/OTA
D. Hawkins
E. Sanders -
A 70-year-old patient presents with symptomatic Haglund's deformity. Conservative management has failed. What is the surgical procedure typically performed?
A. Calcaneal osteotomy
B. Excision of the posterior superior calcaneal tuberosity
C. Achilles tendon lengthening
D. Gastrocnemius recession
E. Resection of an os trigonum -
Which structure forms the roof of the tarsal tunnel?
A. Flexor retinaculum (laciniate ligament)
B. Abductor hallucis muscle
C. Plantar fascia
D. Sustentaculum tali
E. Posterior tibial artery -
A patient sustains a high-energy trauma leading to a Gustilo-Anderson Type IIIA open pilon fracture. What is the initial management strategy?
A. Immediate definitive ORIF
B. External fixation, debridement, and delayed definitive ORIF
C. Amputation
D. Close reduction and cast application
E. Primary total ankle arthroplasty -
Which of the following is a key feature differentiating a true Jones fracture from a pseudo-Jones (avulsion) fracture of the fifth metatarsal?
A. Location distal to the metatarsal tuberosity
B. Associated with an avulsion fragment
C. Located at the metadiaphyseal junction
D. Lower risk of non-union
E. Treated primarily with weight-bearing immobilization -
A patient presents with acute, severe pain and swelling in the hindfoot after jumping from a height. Radiographs reveal a significantly decreased Bohler's angle (less than 20 degrees) and a loss of Gissane's angle. What is the most likely diagnosis?
A. Talus fracture
B. Pilon fracture
C. Calcaneal fracture
D. Lisfranc injury
E. Navicular stress fracture -
What is the primary concern with a symptomatic Type II accessory navicular?
A. Impingement on the subtalar joint
B. Chronic irritation or rupture of the posterior tibial tendon insertion
C. Development of hallux valgus
D. Restriction of ankle dorsiflexion
E. Lateral ankle instability -
In the context of flexible adult acquired flatfoot deformity (Stage IIb PTTD), which procedure involves an opening wedge osteotomy of the medial cuneiform to address a forefoot varus component?
A. Cotton osteotomy
B. Evans calcaneal osteotomy
C. Dwyer calcaneal osteotomy
D. Medializing calcaneal osteotomy
E. Kidner procedure -
A 32-year-old active male sustains a Lisfranc injury. Imaging shows a dorsal displacement of the second metatarsal base from the medial cuneiform. What is the recommended treatment for this unstable injury?
A. Non-weight-bearing cast for 6 weeks
B. Primary arthrodesis of the first to third TMT joints
C. Open reduction and internal fixation with screws or plates
D. Custom orthotics and physical therapy
E. Isolated soft tissue repair -
Which structure is most commonly injured in a supination-adduction (SA) ankle fracture mechanism, according to Lauge-Hansen classification?
A. Anterior inferior tibiofibular ligament
B. Deltoid ligament
C. Anterior talofibular ligament
D. Posterior talofibular ligament
E. Calcaneofibular ligament -
What is the primary indication for surgical debridement of a diabetic foot ulcer?
A. To improve local circulation
B. To remove necrotic tissue and reduce bacterial load
C. To stimulate new skin growth
D. To prevent the development of Charcot arthropathy
E. To initiate systemic antibiotic therapy -
A patient presents with recurrent episodes of pain and swelling in the ankle joint. Arthrography reveals a defect in the superior aspect of the talar dome. Which treatment is typically reserved for large ( >1 cm^2) or deep, symptomatic osteochondral lesions of the talus that have failed conservative management and microfracture?
A. Arthroscopic debridement alone
B. Exostectomy
C. Autologous osteochondral transplantation (OATS) or autologous chondrocyte implantation (ACI)
D. Steroid injection
E. Fusion of the ankle joint
Section 2: Interactive Study Mode (Answers & Rationales)
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A 45-year-old male sustains a pronation-external rotation ankle injury. Radiographs reveal a spiral fracture of the fibula extending 6 cm proximal to the syndesmosis, a shallow posterior malleolar fragment, and an intact medial malleolus. The medial clear space is widened to 6 mm on stress views. Which of the following is the most appropriate management?
Correct Answer: D. ORIF of the fibula, syndesmotic fixation, and assessment of the posterior malleolus
Detailed Academic Rationale: This describes a Weber C fibular fracture (above the level of the syndesmosis) with evidence of syndesmotic instability (widened medial clear space, high fibula fracture in a pronation-external rotation injury). These injuries are inherently unstable due to disruption of both the deltoid ligament medially and the syndesmosis, even if the medial malleolus is intact. A posterior malleolar fragment (even shallow) indicates a degree of posterior injury to the distal tibia, which may require fixation if it is large or contributes to instability. ORIF of the fibula restores length and rotation, but syndesmotic fixation is crucial for stability. Assessment of the posterior malleolus (often via CT) dictates whether it needs internal fixation.- A. Non-operative management is inadequate for an unstable ankle fracture with syndesmotic disruption.
- B. ORIF of the fibula alone would leave the syndesmosis unstable, leading to long-term pain and dysfunction.
- C. While the deltoid ligament is likely injured, direct repair is often not necessary if the fibula and syndesmosis are stably fixed, as the deltoid often heals with appropriate immobilization. However, the syndesmotic fixation is paramount.
- E. Primary total ankle arthroplasty is not indicated for acute trauma; it is reserved for end-stage ankle arthritis.
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A 62-year-old diabetic patient presents with a rapidly progressive, warm, swollen, and erythematous left foot with rocker-bottom deformity. Radiographs show extensive disorganization of the midfoot joints, fragmentation, and osteolysis, but no acute fracture line or dislocation. The skin is intact. What is the most appropriate immediate management?
Correct Answer: B. Non-weight-bearing total contact cast (TCC) application
Detailed Academic Rationale: This clinical scenario (diabetic patient, rapid onset, warmth, swelling, erythema, rocker-bottom deformity, radiographic disorganization without acute fracture) is highly classic for an acute Charcot neuroarthropathy (often Stage I, Eichenholtz classification). The primary goal in acute Charcot is to protect the foot from further collapse and fragmentation. Non-weight-bearing and aggressive immobilization, most effectively with a Total Contact Cast (TCC), are the cornerstones of immediate management. TCC helps to distribute pressure, reduce edema, and protect the fragile foot, promoting healing and preventing further deformity.- A. Surgical debridement and antibiotics would be indicated if there was an active infection (ulceration, purulence, systemic signs), which is not described.
- C. Revascularization is for critical limb ischemia, not the primary treatment for Charcot. While peripheral neuropathy often coexists with peripheral artery disease, the immediate problem described is Charcot.
- D. ORIF is typically reserved for reconstructive surgery in quiescent Charcot deformities or acute fractures in non-Charcot feet, not the initial management of acute Charcot.
- E. Steroid injections are not indicated for Charcot arthropathy and could worsen bone quality.
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A 30-year-old professional athlete suffers an acute Achilles tendon rupture. Physical examination reveals a palpable gap 4 cm proximal to the calcaneal insertion and a positive Thompson test. He desires the quickest return to high-level sports. Which treatment option is most appropriate?
Correct Answer: C. Open repair with augmented reconstruction
Detailed Academic Rationale: For young, active individuals and professional athletes who desire a rapid and robust return to high-level sports, operative repair of an acute Achilles tendon rupture is generally preferred over non-operative management. Open repair allows for direct visualization, precise approximation of the tendon ends, and often augmented repair techniques (e.g., Krackow stitch, plantaris graft) to provide a stronger construct, reducing re-rupture rates compared to non-operative treatment and even some percutaneous methods. While percutaneous repair offers smaller incisions, the ability to augment and ensure strong repair for high-demand athletes is typically favored with open repair.- A. Non-operative management has a higher re-rupture rate, especially in active patients, and a slower return to high-level activity.
- B. Percutaneous repair can be effective but may have a higher risk of sural nerve injury and might not provide the same robust repair for high-demand athletes as an open augmented technique.
- D. Functional bracing is part of post-operative or non-operative rehabilitation but not a definitive treatment for the rupture itself in this context.
- E. PRP injections have limited evidence for primary treatment of acute ruptures and are not a substitute for surgical repair or cast immobilization.
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Regarding a Hawkins Type III talar neck fracture, which of the following statements is most accurate?
Correct Answer: C. Urgent open reduction and internal fixation is indicated to minimize the risk of avascular necrosis.
Detailed Academic Rationale: A Hawkins Type III talar neck fracture involves a displaced talar neck fracture with subtalar and tibiotalar dislocation. This severe injury significantly disrupts the blood supply to the talar body, placing it at a very high risk (estimated 70-100%) of avascular necrosis (AVN). Therefore, urgent open reduction and internal fixation (within 6-8 hours) is critical to attempt to restore blood flow and preserve the talar body, although the risk of AVN remains substantial.- A. Type III involves subtalar AND tibiotalar dislocation, not just subtalar. Type II involves subtalar dislocation.
- B. Type III carries the highest risk of AVN, not the lowest. Type I (non-displaced) has the lowest risk.
- D. Non-operative management is contraindicated due to the high risk of AVN and subsequent collapse of the talus.
- E. Talar neck fractures typically result from high-energy dorsiflexion injuries, often from falls or motor vehicle accidents, not low-energy inversion injuries.
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A 55-year-old obese female presents with a progressive painful flatfoot deformity. Examination reveals a flexible planovalgus foot with hindfoot valgus, forefoot abduction, a "too many toes" sign, and inability to perform a single heel raise. Resisted inversion is weak. Which stage of posterior tibial tendon dysfunction (PTTD) does this describe?
Correct Answer: C. Stage IIb
Detailed Academic Rationale: This presentation is classic for Stage IIb PTTD (Johnson and Strom classification).- Flexible planovalgus foot: Indicates the deformity is reducible.
- Hindfoot valgus, forefoot abduction, "too many toes" sign: Classic features of acquired adult flatfoot.
- Inability to perform a single heel raise: A key indicator of significant posterior tibial tendon weakness/rupture.
- Weak resisted inversion: Direct evidence of PTT pathology.
- The "b" designation in Stage IIb (often used with modifications by Myerson) implies significant forefoot abduction requiring a lateral column lengthening procedure in addition to medial procedures (medializing calcaneal osteotomy, FDL transfer). Stage IIa involves less forefoot abduction and might only require medial-sided procedures.
- Stage I: Tendinosis, pain, but no deformity, normal heel raise.
- Stage III: Rigid deformity, severe hindfoot valgus, fixed forefoot abduction. Arthritis in subtalar joint.
- Stage IV: Deltoid insufficiency with ankle valgus and ankle arthritis.
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A 28-year-old ballet dancer complains of chronic pain in the posterior ankle, exacerbated by pointe work and forced plantarflexion. Imaging reveals an enlarged posterior process of the talus. Which structure is most likely impinged?
Correct Answer: B. Flexor hallucis longus tendon
Detailed Academic Rationale: This describes posterior ankle impingement, commonly seen in ballet dancers due to repetitive forced plantarflexion. An enlarged posterior process of the talus (either an os trigonum or a Stieda process) can impinge between the tibia and calcaneus. The flexor hallucis longus (FHL) tendon, which passes through a fibro-osseous tunnel between the medial and lateral tubercles of the posterior talar process, is frequently irritated and compressed in this scenario. This condition is often called "dancer's ankle."- A. Tibialis anterior tendon is on the anterior aspect of the ankle.
- C. Peroneus brevis tendon is on the lateral aspect.
- D. Posterior tibial nerve is also in the tarsal tunnel but less directly impinged by the posterior talar process in this manner.
- E. Sural nerve is lateral and posterior, but not typically involved in this specific impingement.
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Which of the following describes the correct order of fusion for a triple arthrodesis?
Correct Answer: D. Talonavicular, Subtalar, Calcaneocuboid
Detailed Academic Rationale: The traditional and generally accepted order for performing a triple arthrodesis is:- Talonavicular joint: This is considered the "keystone" of the triple arthrodesis, as it dictates the position of the forefoot relative to the hindfoot. Proper positioning here is critical for correcting forefoot abduction/adduction and midfoot pronation/supination.
- Subtalar joint: Once the talonavicular joint is set, the subtalar joint is fused to control hindfoot varus/valgus and correct hindfoot position relative to the leg.
-
Calcaneocuboid joint:
This joint is fused last, primarily to lock in the correction achieved by the first two fusions and to set the lateral column length.
This sequence allows for progressive correction and ensures proper alignment of the entire foot.
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A patient presents with a displaced intra-articular calcaneal fracture. Which imaging modality is most critical for surgical planning and assessing subtalar joint involvement?
Correct Answer: C. CT scan with 3D reconstructions
Detailed Academic Rationale: For intra-articular calcaneal fractures, a CT scan with 3D reconstructions is the gold standard for surgical planning. Plain radiographs provide initial information but severely underestimate the complexity and displacement of intra-articular fractures. A CT scan clearly delineates the fracture lines, the number and size of articular fragments, the involvement of the posterior and middle facets of the subtalar joint, and the degree of associated comminution. 3D reconstructions are invaluable for visualizing the overall morphology and planning the reduction strategy.- A. Weight-bearing radiographs are contraindicated in acute fractures and do not provide sufficient detail.
- B. MRI is useful for soft tissue injuries or stress fractures but not the primary modality for complex bony anatomy of calcaneal fractures.
- D. Bone scintigraphy is for metabolic activity and tumor/infection, not fracture detail.
- E. Ultrasound has no role in assessing complex calcaneal fractures.
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A 10-year-old child presents with a rigid, painful flatfoot. X-rays show a "C-sign" on the lateral view and an indistinct middle facet of the subtalar joint. What is the most likely diagnosis?
Correct Answer: E. Talocalcaneal coalition
Detailed Academic Rationale: The combination of a rigid, painful flatfoot in a child/adolescent (often presenting during early adolescence as activity increases) and specific radiographic signs points strongly to a tarsal coalition. The "C-sign" on a lateral radiograph, formed by the inferior border of the talar dome and the sustentaculum tali, is highly suggestive of a talocalcaneal coalition. An indistinct or sclerotic middle facet further supports this.- A. Congenital vertical talus presents as a rigid rocker-bottom foot at birth, usually not with a "C-sign".
- B. Flexible pes planovalgus is flexible and typically not painful in this age group, and lacks the specific radiographic signs.
- C. Accessory navicular syndrome causes pain on the medial aspect of the foot but usually doesn't cause a rigid flatfoot or the "C-sign".
- D. Calcaneonavicular coalition is another common type, but the "C-sign" and middle facet involvement are more indicative of talocalcaneal. Calcaneonavicular coalitions often show an "anteater nose" sign on an oblique view.
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A 40-year-old male presents with chronic lateral ankle pain and instability after multiple inversion sprains. Brostrom-Gould repair is planned. Which ligament is primarily reinforced or imbricated in this procedure?
Correct Answer: D. Anterior talofibular ligament
Detailed Academic Rationale: The Brostrom-Gould procedure is a direct anatomical repair for chronic lateral ankle instability. It primarily involves tightening and imbricating the torn or attenuated anterior talofibular ligament (ATFL). The modification by Gould adds the advancement and attachment of a portion of the inferior extensor retinaculum to the distal fibula to reinforce the repair, particularly for the calcaneofibular ligament (CFL) component. However, the ATFL is the primary target and most commonly injured ligament in inversion sprains and chronic instability.- A. Anterior inferior tibiofibular ligament is part of the syndesmosis, involved in high ankle sprains, not typically addressed in a standard Brostrom.
- B. Posterior talofibular ligament is less commonly injured and not the primary target of Brostrom repair.
- C. Calcaneofibular ligament is often injured and may be imbricated, but the ATFL is the primary focus.
- E. Deltoid ligament is on the medial side of the ankle.
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What is the primary advantage of a Lapidus procedure (first metatarsocuneiform fusion) for hallux valgus deformity over a distal osteotomy (e.g., Chevron)?
Correct Answer: B. Addresses a large intermetatarsal angle and corrects frontal plane deformity
Detailed Academic Rationale: The Lapidus procedure involves arthrodesis of the first metatarsocuneiform (MTC) joint. Its primary advantage is its ability to powerfully correct a significantly increased intermetatarsal (IM) angle (typically >15-18 degrees) and concurrently address any associated hypermobility or frontal plane rotation (pronation) of the first metatarsal. Distal osteotomies like the Chevron are less effective for large IM angles and do not correct frontal plane deformity, which is increasingly recognized as a key component of hallux valgus. By fusing the base, the entire first ray is stabilized and repositioned.- A. The Lapidus procedure requires a period of non-weight bearing or protected weight-bearing for fusion to occur, unlike some distal osteotomies that allow earlier weight-bearing.
- C. Return to sports is generally slower with a fusion procedure compared to an osteotomy.
- D. Non-union is a specific risk of any fusion procedure, though generally low with good surgical technique. Malunion risk can be higher if the position is not correct.
- E. The Lapidus procedure fuses the MTC joint, thereby eliminating motion, not preserving it.
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A patient undergoes an open reduction and internal fixation of a severe pilon fracture. Postoperatively, they develop a steppage gait and numbness over the dorsum of the foot, sparing the first web space. Which nerve injury is most likely?
Correct Answer: C. Superficial peroneal nerve
Detailed Academic Rationale: A steppage gait (difficulty dorsiflexing the ankle) combined with numbness over the dorsum of the foot, sparing the first web space , is characteristic of superficial peroneal nerve injury. The superficial peroneal nerve innervates the peroneal muscles (evertors of the foot) and provides sensation to most of the dorsum of the foot, except for the first web space (which is innervated by the deep peroneal nerve). The deep peroneal nerve innervates the ankle dorsiflexors (tibialis anterior, extensors). A pilon fracture surgery involves extensive dissection in the distal tibia and ankle, putting the superficial peroneal nerve at risk, especially with lateral incisions or aggressive retraction.- A. Tibial nerve injury would result in weakness of plantarflexion and intrinsic foot muscles, and sensory loss on the plantar aspect of the foot.
- B. Sural nerve injury would cause sensory loss along the lateral aspect of the foot.
- D. Deep peroneal nerve injury would also cause steppage gait but would typically involve sensory loss in the first web space .
- E. Saphenous nerve injury would cause sensory loss on the medial aspect of the ankle and foot.
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Which of the following conditions is most likely to be associated with an equinus contracture of the ankle?
Correct Answer: C. Plantar fasciitis
Detailed Academic Rationale: An equinus contracture (limited ankle dorsiflexion, tight Achilles tendon/gastrocnemius-soleus complex) increases tension on the plantar fascia. This increased tension is a significant predisposing and perpetuating factor for plantar fasciitis. Patients with equinus often have difficulty stretching the plantar fascia and calf muscles, leading to chronic strain and inflammation.- A. Hallux rigidus is a condition of the great toe MTP joint and is not directly caused or associated with ankle equinus.
- B. Calcaneal stress fractures are usually due to repetitive impact, not primarily equinus.
- D. Morton's neuroma is a nerve entrapment in the forefoot web spaces, unrelated to ankle equinus.
- E. Tarsal tunnel syndrome is entrapment of the tibial nerve, also not directly linked to ankle equinus as a cause.
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A 60-year-old patient with end-stage primary ankle osteoarthritis is being considered for surgical intervention. Which factor is a relative contraindication to total ankle arthroplasty (TAA) but less so for ankle arthrodesis?
Correct Answer: B. Morbid obesity (BMI >40)
Detailed Academic Rationale: Morbid obesity (typically BMI >40) is generally considered a relative contraindication for total ankle arthroplasty (TAA). The increased mechanical load and stress on the implant are associated with a higher risk of aseptic loosening, subsidence, and failure of the components. While obesity can also complicate ankle arthrodesis (e.g., higher non-union rates, wound complications), an arthrodesis provides a more mechanically stable and durable construct in the face of very high loads compared to an arthroplasty.- A. Significant ankle varus deformity (>15 degrees) can be addressed by TAA but may require complex soft tissue releases or osteotomies. Severe fixed deformity can be a contraindication for TAA, but it is also challenging for arthrodesis, requiring significant bone resection and potential for malalignment. The question states relative contraindication for TAA but less so for arthrodesis. Arthrodesis can definitively correct severe fixed deformities.
- C. Active infection is an absolute contraindication for any joint replacement or elective fusion procedure.
- D. Avascular necrosis of the talus is a relative contraindication to TAA due to compromised bone stock and healing, making TAA less predictable. However, it can also complicate fusion. For severe AVN, both may be challenging.
- E. Severe subtalar arthritis is generally considered a relative contraindication for TAA because TAA does not address the subtalar joint. It is a contraindication for TAA because it may lead to persistent pain post-TAA. However, it is an indication for subtalar fusion, often performed concurrently or as part of a hindfoot fusion, making it certainly not "less so" a contraindication for arthrodesis (it might even indicate a more extensive fusion).
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A patient presents with acute onset of severe pain, swelling, and erythema of the first metatarsophalangeal (MTP) joint. Synovial fluid analysis reveals negatively birefringent urate crystals. What is the most appropriate long-term management strategy for this condition?
Correct Answer: C. Urate-lowering therapy (e.g., allopurinol) once acute inflammation subsides
Detailed Academic Rationale: This clinical picture and synovial fluid analysis are pathognomonic for an acute gout attack. The immediate treatment focuses on controlling the acute inflammation (NSAIDs, colchicine, or steroids). However, the question asks for long-term management. Long-term management of recurrent gout involves urate-lowering therapy (ULT), such as allopurinol or febuxostat, to reduce serum uric acid levels below the saturation point (typically <6 mg/dL) and prevent future attacks and crystal deposition. This therapy should typically be initiated after the acute attack has subsided to avoid precipitating another attack due to rapid changes in serum urate levels.- A. Chronic NSAID use is not a sustainable or appropriate long-term strategy due to systemic side effects.
- B. Repeated intra-articular steroid injections are not a long-term solution for systemic gout and carry risks.
- D. Urgent surgical debridement is not indicated for an acute inflammatory arthritis like gout.
- E. Indefinite immobilization is inappropriate for gout.
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Which of the following is considered the most common type of traumatic Lisfranc injury?
Correct Answer: A. Homolateral
Detailed Academic Rationale: Lisfranc injuries involve disruption of the tarsometatarsal (TMT) joints. The commonly accepted classification is based on the displacement pattern:- Homolateral: All five metatarsals are displaced in the same direction, typically laterally, without significant intermetatarsal widening. This is considered the most common pattern.
- Divergent: The first metatarsal displaces medially, and the lateral four metatarsals displace laterally.
- Partial: One or two metatarsals are displaced, while the others remain in place.
- Isolated: A single metatarsal is displaced.
- Combined homolateral and divergent is not a standard distinct classification type in the same vein.
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A 35-year-old male presents with chronic pain and swelling over the lateral aspect of his ankle, exacerbated by activity. Examination reveals tenderness over the distal fibula and a palpable "snapping" with active dorsiflexion and eversion. What is the most likely diagnosis?
Correct Answer: B. Peroneal tendon subluxation/dislocation
Detailed Academic Rationale: The key finding here is the palpable "snapping" over the lateral aspect of the ankle, specifically with active dorsiflexion and eversion. This movement causes the peroneal tendons (typically peroneus brevis) to dislocate anteriorly from their groove behind the lateral malleolus. This usually occurs due to a tear or avulsion of the superior peroneal retinaculum, which normally holds the tendons in place.- A. Peroneus brevis tendinopathy would cause pain and tenderness but typically no snapping/dislocation.
- C. Chronic lateral ankle instability involves ligamentous laxity and a feeling of "giving way", but not usually snapping of tendons.
- D. Anterior inferior tibiofibular ligament injury is a syndesmotic injury, causing high ankle pain, not peroneal snapping.
- E. Osteochondral lesion of the talus causes deep ankle pain, often mechanical, but no peroneal snapping.
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In the evaluation of a patient with suspected tarsal tunnel syndrome, which of the following physical examination findings is most specific?
Correct Answer: B. Positive Tinel's sign posterior to the medial malleolus
Detailed Academic Rationale: Tarsal tunnel syndrome is an entrapment neuropathy of the tibial nerve or its branches as they pass through the tarsal tunnel posterior to the medial malleolus. A positive Tinel's sign (elicitation of tingling or electric-shock sensations radiating into the foot upon percussion over the nerve) at this specific location is the most classic and specific physical examination finding for tarsal tunnel syndrome.- A. Homan's sign is for deep vein thrombosis.
- C. Absent pedal pulses indicate vascular compromise, not nerve entrapment.
- D. Weakness of ankle dorsiflexion points to deep peroneal nerve involvement or L4-L5 radiculopathy, not tibial nerve (tarsal tunnel syndrome).
- E. Loss of sensation over the dorsum of the foot suggests superficial peroneal or deep peroneal nerve involvement. Tarsal tunnel syndrome affects the plantar aspect of the foot (medial/lateral plantar nerves).
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Which imaging modality is considered the gold standard for diagnosing a navicular stress fracture that is not visible on plain radiographs?
Correct Answer: B. MRI
Detailed Academic Rationale: Navicular stress fractures are notorious for being radiographically occult on plain X-rays, especially in their early stages. MRI is considered the gold standard imaging modality for diagnosing these fractures. It can detect bone marrow edema, fracture lines, and associated soft tissue changes before they are visible on plain films or even CT scans. Early diagnosis is crucial due to the high risk of non-union in navicular stress fractures.- A. CT scan is excellent for bony detail but less sensitive than MRI for early stress fractures.
- C. Bone scan (scintigraphy) is highly sensitive for stress reactions but lacks specificity and anatomical detail compared to MRI.
- D. Ultrasound is not useful for bone stress fractures.
- E. PET scan is not indicated for stress fractures.
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A 7-year-old child presents with a progressive, painless, rigid flatfoot deformity and a palpable prominence on the medial aspect of the foot. Lateral radiographs show a 'nutcracker' deformity where the talar head appears impinged. Which condition is most likely?
Correct Answer: B. Congenital vertical talus
Detailed Academic Rationale: Congenital vertical talus (CVT) is characterized by a rigid rocker-bottom foot, a fixed dorsiflexed position of the talus, and a dorsal dislocation of the navicular on the talus. This creates a "nutcracker" appearance on lateral radiographs, where the talar head is plantarflexed and often palpable medially. The foot is rigid and painless in early childhood.- A. Flexible pes planovalgus is flexible, typically painless, and does not have a "nutcracker" deformity.
- C. Tarsal coalition can cause rigid flatfoot but usually presents in adolescence and does not have the classic "nutcracker" deformity with talar head impingement.
- D. Accessory navicular causes pain on the medial arch but not typically a rigid flatfoot or rocker-bottom foot.
- E. Charcot-Marie-Tooth disease can cause various foot deformities, including pes cavus or pes planus, but CVT is a distinct congenital anomaly.
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What is the primary blood supply to the talus, making it susceptible to avascular necrosis following certain fracture patterns?
Correct Answer: D. Anastomotic network from anterior tibial, posterior tibial, and peroneal arteries
Detailed Academic Rationale: The talus has a tenuous blood supply derived from an anastomotic network of vessels originating from the anterior tibial (dorsalis pedis branch), posterior tibial (deltoid and tarsal canal branches), and peroneal (sinus tarsi branch) arteries. These vessels form an extracapsular arterial ring around the talar neck. Fractures, particularly talar neck fractures (Hawkins II, III, IV) and dislocations, can disrupt this delicate network, especially the artery of the tarsal canal (a major branch of the posterior tibial artery) and the deltoid branches, leading to a high risk of avascular necrosis (AVN) of the talar body.- A, B, C. While branches from each of these arteries contribute, it is the anastomotic network and the specific branches within it (e.g., deltoid, tarsal canal, sinus tarsi) that are crucial. No single artery is the sole "primary" supply; it's the network that is vulnerable.
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A patient with a displaced intra-articular calcaneal fracture (Sanders Type IIB) is planned for operative management. Which of the following is a common approach for fixation of such fractures?
Correct Answer: C. Lateral extensile approach
Detailed Academic Rationale: For displaced intra-articular calcaneal fractures, especially those involving the posterior facet of the subtalar joint (like Sanders Type IIB), the lateral extensile approach is the most common and widely used surgical approach. This approach provides excellent visualization of the lateral calcaneal wall, the posterior facet, and allows for reconstruction of the subtalar joint surface and restoration of calcaneal height, width, and alignment.- A. Direct anterior approach is not suitable for calcaneal fractures.
- B. Posteromedial approach is used for specific fracture patterns involving the medial wall or sustentaculum tali, often in conjunction with a lateral approach, or for specific talar injuries.
- D. Medial approach is for specific medial fragment fixation (e.g., sustentacular fractures) or certain subtalar fusions.
- E. Dorsal approach is not applicable to calcaneal fractures.
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Which of the following is a key component of the spring ligament complex, crucial for supporting the medial longitudinal arch?
Correct Answer: C. Plantar calcaneonavicular ligament
Detailed Academic Rationale: The spring ligament complex is a critical stabilizer of the medial longitudinal arch and the talar head. It consists primarily of the plantar calcaneonavicular ligament, which runs from the sustentaculum tali of the calcaneus to the plantar aspect of the navicular. It supports the head of the talus, preventing its plantar displacement and maintaining arch height. Its dysfunction is a hallmark of adult acquired flatfoot deformity.- A. Calcaneofibular ligament is a lateral ankle ligament.
- B. Bifurcate ligament is a midfoot ligament (calcaneocuboid and calcaneonavicular components) on the dorsal aspect.
- D. Long plantar ligament spans from the calcaneus to the cuboid and metatarsals, providing longitudinal arch support but is distinct from the spring ligament.
- E. Short plantar ligament runs from the calcaneus to the cuboid, also supporting the lateral arch.
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A 68-year-old patient with severe hallux rigidus (Grade IV) reports significant pain and limited MTP joint motion. They are a low-demand individual. What is the most appropriate surgical option?
Correct Answer: B. MTP joint fusion
Detailed Academic Rationale: For severe hallux rigidus (Grade IV, often involving significant cartilage loss, pain at rest, and minimal motion), especially in an older, low-demand individual, arthrodesis (fusion) of the first metatarsophalangeal (MTP) joint is often considered the gold standard. It provides predictable pain relief, long-term durability, and a stable, functional foot for activities of daily living. While it eliminates motion, the pain relief and stability are often highly valued by patients in this demographic.- A. Cheilectomy is for earlier stages (Grade I/II) with dorsal impingement and preserved joint space.
- C. MTP joint hemiarthroplasty (implant for one side of the joint) can be an option but has variable long-term results and higher rates of revision than fusion.
- D. MTP joint total arthroplasty (implant for both sides) also has unpredictable long-term outcomes, particularly in terms of implant survival and pain relief, and is less favored than fusion for severe disease.
- E. Metatarsal shortening osteotomy is not the primary treatment for severe hallux rigidus; it might be used to address specific metatarsal length issues in conjunction with other procedures.
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What is the primary deforming force responsible for the development of claw toes?
Correct Answer: D. Weakness of the intrinsic foot muscles and overactivity of the extrinsic muscles
Detailed Academic Rationale: Claw toe deformity is characterized by hyperextension of the metatarsophalangeal (MTP) joint, flexion of the proximal interphalangeal (PIP) joint, and flexion of the distal interphalangeal (DIP) joint. The primary underlying mechanism is an imbalance between the intrinsic (lumbricals and interossei) and extrinsic (flexor digitorum longus/brevis, extensor digitorum longus/brevis) muscles. Weakness of the intrinsic muscles (often due to neuropathy like in Charcot-Marie-Tooth) allows the stronger extrinsic flexors and extensors to exert their pull unopposed, leading to MTP hyperextension and PIP/DIP flexion.- A. Weakness of interossei muscles is a component but the overall imbalance with extrinsic muscles is key.
- B. Overactivity of the extensor digitorum longus contributes to MTP hyperextension, but it is not the sole or primary deforming force, and intrinsic weakness is fundamental.
- C. Overactivity of the flexor digitorum longus contributes to PIP/DIP flexion but again, intrinsic weakness is critical.
- E. Plantar plate rupture is associated with hammertoes or crossover toes but is not the primary mechanism for generalized claw toe deformity.
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A 25-year-old male sustains a high-energy trauma resulting in a calcaneal fracture. He develops severe pain, paresthesias, and weakness of toe flexion. Examination reveals a tense plantar foot compartment. What is the most appropriate immediate management?
Correct Answer: C. Emergent four-compartment fasciotomy of the foot
Detailed Academic Rationale: This clinical picture (severe pain out of proportion, paresthesias, weakness, tense compartment following high-energy trauma) is highly suggestive of acute compartment syndrome of the foot. Calcaneal fractures, especially high-energy ones, are a common cause. The foot typically has nine compartments, but for practical fasciotomy, usually four incisions (medial, lateral, two dorsal) are performed to release all compartments (medial, lateral, superficial, deep). Emergent fasciotomy is the only effective treatment to prevent irreversible muscle and nerve damage, including Volkmann's ischemia.- A. CT angiography is for vascular injury, not compartment syndrome.
- B, D, E. Close observation, analgesia, elevation, ice, and cast immobilization are contraindicated as they delay definitive treatment and can worsen outcomes in compartment syndrome.
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Which nerve is most at risk during a standard anterolateral approach to the ankle for osteochondral lesion debridement?
Correct Answer: D. Superficial peroneal nerve
Detailed Academic Rationale: The superficial peroneal nerve is highly vulnerable during anterolateral approaches to the ankle. It emerges from the deep fascia approximately 10-15 cm proximal to the ankle joint and then divides into intermediate and medial dorsal cutaneous nerves, which cross the ankle joint anteriorly and laterally. Incisions in this region, especially if not carefully deepened, can easily injure these branches, leading to sensory loss over the dorsum of the foot and potentially a painful neuroma.- A. Sural nerve is on the posterolateral aspect.
- B. Saphenous nerve is on the anteromedial aspect.
- C. Deep peroneal nerve runs deeper, usually between the tibialis anterior and extensor hallucis longus tendons, and is less commonly injured with skin incisions, though it can be at risk with deeper dissection.
- E. Tibial nerve is on the posteromedial aspect, within the tarsal tunnel.
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A patient presents with a chronic ulcer on the plantar aspect of the first metatarsal head. They have a history of diabetes mellitus and palpable pulses. What is the initial priority in the management of this ulcer?
Correct Answer: D. Offloading of the affected area
Detailed Academic Rationale: For diabetic foot ulcers, especially neuropathic ulcers on pressure-bearing surfaces with palpable pulses (indicating no critical limb ischemia), offloading is the initial and paramount step. Diabetic neuropathy leads to loss of protective sensation, allowing repetitive pressure and shear forces to cause skin breakdown. Effective offloading (e.g., total contact cast, removable cast walker, specialized shoes/insoles) reduces these forces, allowing the ulcer to heal. While debridement is important, it's secondary to reducing the primary mechanical insult.- A. Surgical revascularization is indicated if there is significant peripheral arterial disease (critical limb ischemia), but the problem statement indicates palpable pulses.
- B. Systemic antibiotic therapy is indicated for infection, which should be assessed, but offloading is essential for healing even without overt infection.
- C. Aggressive surgical debridement is crucial for removing necrotic tissue and biofilm, but without offloading, recurrence is almost guaranteed.
- E. Daily wound packing with antiseptics is part of local wound care but not the initial priority over addressing the mechanical cause.
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A 40-year-old active runner develops chronic pain and tenderness along the posteromedial aspect of the ankle. Imaging shows thickening and signal changes within the flexor hallucis longus (FHL) tendon sheath. What is the most likely diagnosis?
Correct Answer: C. FHL tendinopathy (dancer's tendinitis)
Detailed Academic Rationale: Chronic pain and tenderness along the posteromedial aspect of the ankle, particularly with imaging showing FHL tendon sheath involvement, is characteristic of FHL tendinopathy. While often called "dancer's tendinitis" due to its prevalence in ballet, it can affect runners and other athletes who perform repetitive push-off and toe-off maneuvers, which load the FHL. The FHL tendon runs through the tarsal tunnel (superomedial to the posterior talar process), where it can be irritated.- A. Achilles tendinopathy is posterior, usually proximal to the insertion, and involves the Achilles tendon.
- B. Posterior tibial tendon dysfunction causes medial ankle pain and often results in adult acquired flatfoot deformity, involving the PTT, not FHL.
- D. Tarsal tunnel syndrome is nerve compression, primarily causing neuropathic pain, not typically tendon-specific tendinopathy, though FHL pathology can coexist or contribute.
- E. Peroneal tendinopathy is on the lateral aspect of the ankle.
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Which of the following statements regarding a Jones fracture (fracture at the metadiaphyseal junction of the fifth metatarsal) is true?
Correct Answer: B. It occurs within the watershed area, predisposing to non-union.
Detailed Academic Rationale: A Jones fracture is a transverse fracture at the metadiaphyseal junction of the fifth metatarsal, approximately 1.5-3 cm distal to the tuberosity. This specific location is known as a "watershed area" with a relatively poor blood supply compared to more proximal or distal areas. This vascular vulnerability predisposes Jones fractures to a higher rate of delayed union or non-union, especially with conservative management in active individuals.- A. It has a high rate of non-union, especially in active patients with conservative treatment.
- C. It typically results from an adduction force on the forefoot when the ankle is plantarflexed, not an avulsion injury. Avulsion fractures of the fifth metatarsal tuberosity (pseudo-Jones) are more proximal and caused by peroneus brevis pull.
- D. Due to the high non-union risk, non-weight bearing immobilization is typically recommended for 6-8 weeks (or surgical fixation for athletes/displaced fractures), not early weight-bearing.
- E. Surgical intervention is often indicated for athletes, displaced fractures, or those who fail conservative management, due to the non-union risk.
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What is the most common direction of a traumatic ankle dislocation without associated fracture?
Correct Answer: B. Posterior
Detailed Academic Rationale: Traumatic ankle dislocations without associated fracture are rare, as the ankle mortise is highly stable. When they do occur, posterior dislocations are the most common. This typically results from a severe plantarflexion injury, often with a component of rotational force, tearing the deltoid and lateral collateral ligaments.- A. Anterior dislocations are less common, often associated with forced dorsiflexion.
- C, D. Medial and lateral dislocations are also rare and usually involve extensive ligamentous disruption.
- E. Superior dislocation is extremely rare and implies severe syndesmotic disruption and usually a pilon fracture.
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In the assessment of an adult acquired flatfoot deformity, which surgical procedure aims to correct hindfoot valgus and relieve tension on the medial soft tissues?
Correct Answer: D. Medializing calcaneal osteotomy
Detailed Academic Rationale: A medializing calcaneal osteotomy (often a posterior slide osteotomy) is a cornerstone procedure for correcting hindfoot valgus in adult acquired flatfoot deformity (e.g., PTTD Stage II). By shifting the posterior fragment of the calcaneus medially, the mechanical axis of the hindfoot is corrected. This moves the Achilles tendon's insertion more medially, making it a hindfoot supinator and relieving the tensile forces on the attenuated posterior tibial tendon and other medial soft tissues, thus reducing progression of the deformity.- A. Evans calcaneal osteotomy is a lateral column lengthening osteotomy, used to correct forefoot abduction.
- B. Dwyer calcaneal osteotomy is a closing wedge osteotomy for hindfoot varus (pes cavus).
- C. Lateral column lengthening (e.g., Evans) corrects forefoot abduction, not primarily hindfoot valgus.
- E. Cotton osteotomy is a dorsal opening wedge osteotomy of the medial cuneiform, used to correct forefoot varus and plantarflex the medial column, which is often a component of flexible flatfoot, but not directly addressing hindfoot valgus.
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Which of the following is the most sensitive imaging modality for detecting early osteochondral lesions of the talus (OLT)?
Correct Answer: C. MRI
Detailed Academic Rationale: MRI is the most sensitive imaging modality for detecting and characterizing osteochondral lesions of the talus (OLT). It can visualize not only the cartilage defect but also subchondral bone edema, cysts, and the stability of the lesion (e.g., presence of fluid under the fragment). Plain radiographs are often normal in early OLTs, and CT is excellent for bony detail but less sensitive for cartilage assessment or early bone marrow changes.- A. Plain radiographs are usually normal or show only subtle changes in early OLT.
- B. CT scan is excellent for subchondral cysts and bony fragments, but less sensitive for cartilage itself or early edema.
- D. Bone scan is sensitive for increased metabolic activity but not specific for OLT.
- E. Ultrasound is generally not useful for assessing deep bone and cartilage lesions.
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A patient presents with a history of recurrent ankle sprains and complaints of the ankle "giving way" on uneven ground. Clinical examination confirms chronic lateral ankle instability. Which modified Brostrom-Gould procedure involves imbrication of the anterior talofibular ligament and calcaneofibular ligament, augmented by a flap of the inferior extensor retinaculum?
Correct Answer: B. Brostrom-Gould
Detailed Academic Rationale: The Brostrom-Gould procedure is the standard anatomical repair for chronic lateral ankle instability. It involves:- Tightening and imbrication of the attenuated anterior talofibular ligament (ATFL).
- Tightening and imbrication of the calcaneofibular ligament (CFL) if significantly attenuated.
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Augmentation by advancing a flap of the inferior extensor retinaculum to reinforce the repair and provide additional stability.
The original Brostrom technique only involved the direct ligament repair without the retinacular augmentation. - A. Brostrom original: direct repair without retinacular augmentation.
- C. Watson-Jones: non-anatomical reconstruction using peroneus brevis tendon.
- D. Chrisman-Snook: non-anatomical reconstruction using peroneus brevis tendon.
- E. Allograft reconstruction: used for revision or severely deficient native ligaments.
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What is the primary role of the tibialis anterior muscle in foot and ankle biomechanics?
Correct Answer: B. Ankle dorsiflexion and inversion
Detailed Academic Rationale: The tibialis anterior muscle is a powerful ankle dorsiflexor and an invertor of the foot. It is active during the swing phase of gait to clear the foot and during initial contact to control plantarflexion. It also contributes significantly to maintaining the medial longitudinal arch.- A. Ankle plantarflexion and inversion is primarily performed by tibialis posterior and gastrocnemius/soleus.
- C. Ankle eversion and plantarflexion are actions of the peroneal muscles.
- D. Ankle dorsiflexion and eversion are actions of extensor digitorum longus and peroneus tertius.
- E. Toe extension is primarily by the extensor digitorum longus and extensor hallucis longus.
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Which of the following is a common early complication of total ankle arthroplasty (TAA)?
Correct Answer: D. Stiffness
Detailed Academic Rationale: Stiffness (restricted range of motion) is a relatively common early complication after total ankle arthroplasty. While the goal of TAA is to preserve motion, adhesions, soft tissue scarring, component malposition, or residual pain can lead to suboptimal motion post-operatively. Early and aggressive physical therapy is crucial to mitigate this.- A. Component subsidence: More of a late complication, typically related to aseptic loosening or osteolysis.
- B. Deep infection: While a severe complication, its incidence is relatively low (1-5%).
- C. Avascular necrosis of the talus: Less common as a new complication after TAA unless there was pre-existing AVN. TAA is often performed for arthritis secondary to AVN.
- E. Neuroma formation: Can occur, but stiffness is generally a more frequently encountered functional issue post-TAA.
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A 6-month-old infant is diagnosed with idiopathic congenital talipes equinovarus (clubfoot). According to the Ponseti method, what is the initial step in treatment?
Correct Answer: B. Serial manipulation and long leg casting with specific correction principles
Detailed Academic Rationale: The Ponseti method is the gold standard for treating idiopathic clubfoot. The initial and most crucial step involves a series of gentle, specific manipulations of the foot followed by the application of long leg plaster casts. These manipulations are performed weekly, sequentially correcting the cavus, adduction, and varus components of the deformity, while progressively abducting the foot around a stable talus. The equinus is corrected last.- A. Immediate surgical correction is avoided in the Ponseti method unless casting fails or for severe rigid cases resistant to casting.
- C. Application of a foot abduction brace is the final step in the Ponseti protocol, used for maintenance after casting and tenotomy.
- D. Percutaneous Achilles tenotomy is performed after the serial casting has corrected all components except for residual equinus.
- E. Stretching exercises by parents alone are insufficient for correcting clubfoot deformity.
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A patient with severe hallux rigidus undergoes a cheilectomy. What is the primary goal of this procedure?
Correct Answer: B. To decompress the first MTP joint and improve dorsiflexion
Detailed Academic Rationale: A cheilectomy involves the surgical removal of dorsal osteophytes (bone spurs) from the head of the first metatarsal and often a portion of the dorsal aspect of the proximal phalanx. This procedure is typically performed for early to moderate hallux rigidus (Grade I/II) to decompress the first MTP joint, relieve dorsal impingement, and improve the range of motion, particularly dorsiflexion, thereby reducing pain during toe-off.- A. To fuse the first MTP joint is an arthrodesis, a different procedure for more severe cases.
- C. To shorten the first metatarsal is a shortening osteotomy, used to address metatarsus primus elevatus or to balance relative lengths.
- D. To excise the sesamoids is for sesamoiditis or fracture, not primary hallux rigidus.
- E. To correct hallux valgus deformity is the goal of a bunionectomy, not a cheilectomy.
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Which of the following ankle fracture classifications primarily describes the level of the fibular fracture in relation to the syndesmosis?
Correct Answer: B. Danis-Weber
Detailed Academic Rationale: The Danis-Weber classification (often just called Weber classification) categorizes fibular fractures based on their relationship to the syndesmosis:- Weber A: Fracture distal to the syndesmosis.
- Weber B: Fracture at the level of the syndesmosis.
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Weber C: Fracture proximal to the syndesmosis.
This classification is simple and widely used to infer the stability of the syndesmosis. - A. Lauge-Hansen classification describes ankle fractures based on the position of the foot at the time of injury and the deforming force (e.g., Supination-Adduction, Pronation-External Rotation).
- C. AO/OTA classification is a comprehensive alphanumeric system for all fractures, including ankle fractures, based on anatomy and morphology.
- D. Hawkins classification is specifically for talar neck fractures.
- E. Sanders classification is for calcaneal fractures.
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A 70-year-old patient presents with symptomatic Haglund's deformity. Conservative management has failed. What is the surgical procedure typically performed?
Correct Answer: B. Excision of the posterior superior calcaneal tuberosity
Detailed Academic Rationale: Haglund's deformity is a bony prominence (exostosis) on the posterior aspect of the calcaneal tuberosity. When symptomatic, it can cause impingement and irritation of the overlying Achilles tendon (retrocalcaneal bursitis, insertional Achilles tendinopathy). Surgical treatment involves resection of this prominent portion of the calcaneus, known as a retrocalcaneal decompression or calcaneal ostectomy.- A. Calcaneal osteotomy is a broader term for cutting the calcaneus; a specific ostectomy is for Haglund's.
- C. Achilles tendon lengthening is for equinus contracture.
- D. Gastrocnemius recession is for isolated gastrocnemius contracture.
- E. Resection of an os trigonum is for posterior ankle impingement involving an accessory ossicle.
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Which structure forms the roof of the tarsal tunnel?
Correct Answer: A. Flexor retinaculum (laciniate ligament)
Detailed Academic Rationale: The tarsal tunnel is an osseofibrous canal located posterior to the medial malleolus. Its boundaries are:- Roof: Flexor retinaculum (also known as the laciniate ligament).
- Floor: Medial aspect of the talus, sustentaculum tali of the calcaneus, and distal tibia.
- Contents: Tibial nerve, posterior tibial artery and veins, and the tendons of the tibialis posterior, flexor digitorum longus, and flexor hallucis longus (anterior to posterior, often remembered as "Tom, Dick, And Harry").
- B. Abductor hallucis muscle forms part of the floor/lateral wall, not the roof.
- C. Plantar fascia is much more distal and plantar.
- D. Sustentaculum tali is part of the floor/bony wall.
- E. Posterior tibial artery is a content of the tunnel, not a boundary.
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A patient sustains a high-energy trauma leading to a Gustilo-Anderson Type IIIA open pilon fracture. What is the initial management strategy?
Correct Answer: B. External fixation, debridement, and delayed definitive ORIF
Detailed Academic Rationale: High-energy open pilon fractures (fractures of the distal tibia involving the ankle joint) with significant soft tissue compromise (like Gustilo-Anderson Type IIIA) are best managed with a staged protocol. The initial priority is emergent debridement of contaminated and devitalized tissue, copious irrigation, and stabilization of the fracture with external fixation. This allows for soft tissue recovery, reduction of swelling, and re-epithelialization of open wounds. Definitive open reduction and internal fixation (ORIF) is then performed in a delayed fashion (typically 7-14 days later) once the soft tissue envelope has improved, minimizing the risk of wound complications and infection.- A. Immediate definitive ORIF carries a very high risk of wound breakdown and deep infection in the presence of compromised soft tissues.
- C. Amputation is a last resort, usually for irrecoverable limbs.
- D. Close reduction and cast application are inadequate for unstable, open, intra-articular fractures.
- E. Primary TAA is contraindicated in acute trauma and open fractures.
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Which of the following is a key feature differentiating a true Jones fracture from a pseudo-Jones (avulsion) fracture of the fifth metatarsal?
Correct Answer: C. Located at the metadiaphyseal junction
Detailed Academic Rationale:- Jones fracture: Located at the metadiaphyseal junction of the fifth metatarsal, approximately 1.5-3 cm distal to the tuberosity. These are prone to non-union due to their location in a watershed area.
- Pseudo-Jones (avulsion) fracture: Located more proximally, at the base or tuberosity of the fifth metatarsal. It is an avulsion injury caused by the pull of the peroneus brevis tendon or lateral plantar fascia. These typically heal well with conservative treatment.
- A. Location distal to the metatarsal tuberosity (but at the metadiaphyseal junction) describes Jones. Avulsion is at the tuberosity.
- B. Associated with an avulsion fragment describes pseudo-Jones.
- D. Jones fractures have a higher risk of non-union. Pseudo-Jones have a lower risk.
- E. Pseudo-Jones are often treated with weight-bearing immobilization; Jones often require non-weight bearing or surgical intervention.
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A patient presents with acute, severe pain and swelling in the hindfoot after jumping from a height. Radiographs reveal a significantly decreased Bohler's angle (less than 20 degrees) and a loss of Gissane's angle. What is the most likely diagnosis?
Correct Answer: C. Calcaneal fracture
Detailed Academic Rationale: This is a classic presentation for an intra-articular calcaneal fracture (often a "lover's fracture" from a fall from height).- Bohler's angle: Formed by lines connecting the superior aspect of the posterior tuberosity, the superior portion of the posterior facet, and the superior aspect of the anterior process. Normal is 20-40 degrees. A decreased angle indicates collapse of the posterior facet.
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Gissane's angle (Crucial angle of Gissane):
Formed by the intersection of two lines on the lateral calcaneus (one along the posterior facet, one along the anterior process/cuboid facet). Normal is 95-105 degrees. A loss of Gissane's angle (approaching 180 degrees) indicates collapse of the lateral calcaneal mass.
Both findings are hallmarks of a displaced intra-articular calcaneal fracture. - A. Talus fracture would involve different angles or anatomical areas.
- B. Pilon fracture involves the distal tibia.
- D. Lisfranc injury involves the midfoot (tarsometatarsal joints).
- E. Navicular stress fracture involves the navicular bone and does not present with these specific angle changes.
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What is the primary concern with a symptomatic Type II accessory navicular?
Correct Answer: B. Chronic irritation or rupture of the posterior tibial tendon insertion
Detailed Academic Rationale: A Type II accessory navicular is a fibrocartilaginous or synchondrotic union between the accessory bone and the navicular body. The posterior tibial tendon (PTT) inserts directly into this accessory navicular. When symptomatic (often due to trauma or repetitive stress), the primary concern is chronic irritation, inflammation, or even rupture of the PTT at its insertion site, leading to pain on the medial arch and potentially contributing to a progressive flatfoot deformity.- A. Impingement on the subtalar joint is not the primary concern.
- C. Development of hallux valgus is not directly related.
- D. Restriction of ankle dorsiflexion is not a primary concern.
- E. Lateral ankle instability is unrelated.
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In the context of flexible adult acquired flatfoot deformity (Stage IIb PTTD), which procedure involves an opening wedge osteotomy of the medial cuneiform to address a forefoot varus component?
Correct Answer: A. Cotton osteotomy
Detailed Academic Rationale: A Cotton osteotomy is a dorsal opening wedge osteotomy of the medial cuneiform. It is performed in the surgical correction of flexible adult acquired flatfoot deformity (especially in Stage II PTTD) when there is a component of forefoot varus or plantarflexion insufficiency of the medial column. By opening the wedge dorsally and inserting a bone graft, it plantarflexes the medial cuneiform, bringing the first ray down and improving the arch.- B. Evans calcaneal osteotomy is a lateral column lengthening.
- C. Dwyer calcaneal osteotomy is a closing wedge for hindfoot varus.
- D. Medializing calcaneal osteotomy corrects hindfoot valgus.
- E. Kidner procedure is for symptomatic accessory navicular.
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A 32-year-old active male sustains a Lisfranc injury. Imaging shows a dorsal displacement of the second metatarsal base from the medial cuneiform. What is the recommended treatment for this unstable injury?
Correct Answer: C. Open reduction and internal fixation with screws or plates
Detailed Academic Rationale: Lisfranc injuries, particularly those with displacement or instability (as indicated by dorsal displacement), are unstable and typically require surgical stabilization. Open reduction and internal fixation (ORIF) with screws or plates is the standard of care. The goal is anatomical reduction of the TMT joints, especially the critical first and second TMT joints, to restore the midfoot architecture and prevent post-traumatic arthritis and chronic pain. The second metatarsal base to medial cuneiform is the keystone of the Lisfranc joint.- A. Non-weight-bearing cast is only for stable, non-displaced Lisfranc sprains, not for a displaced injury.
- B. Primary arthrodesis is an option, especially for chronic injuries, highly comminuted fractures, or in older, less active individuals, but ORIF is generally preferred for acute, reducible injuries in younger, active patients.
- D. Custom orthotics and physical therapy are for rehabilitation after definitive treatment, not primary management of a displaced injury.
- E. Isolated soft tissue repair is generally insufficient for a displaced Lisfranc injury, which often involves bony and ligamentous disruption.
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Which structure is most commonly injured in a supination-adduction (SA) ankle fracture mechanism, according to Lauge-Hansen classification?
Correct Answer: C. Anterior talofibular ligament
Detailed Academic Rationale: In the Lauge-Hansen supination-adduction (SA) mechanism:- SA Stage I: Involves transverse fracture of the lateral malleolus below the level of the syndesmosis (Weber A equivalent) or rupture of the anterior talofibular ligament (ATFL). Given the adduction force, the ATFL is often the primary soft tissue structure to fail.
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SA Stage II:
Adds an oblique or vertical fracture of the medial malleolus.
Therefore, the ATFL is the structure most commonly injured in the initial stages of a supination-adduction injury. - A. Anterior inferior tibiofibular ligament is part of the syndesmosis, involved in pronation-external rotation or supination-external rotation injuries, not primary SA.
- B. Deltoid ligament is on the medial side and typically tears in pronation injuries.
- D. Posterior talofibular ligament is injured in severe external rotation injuries, typically along with ATFL and CFL.
- E. Calcaneofibular ligament is injured in more severe inversion injuries, often with ATFL.
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What is the primary indication for surgical debridement of a diabetic foot ulcer?
Correct Answer: B. To remove necrotic tissue and reduce bacterial load
Detailed Academic Rationale: Surgical debridement is a critical component in the management of diabetic foot ulcers, particularly those with signs of infection or necrosis. The primary indications are to remove necrotic tissue (slough, eschar), callus, and biofilm. This effectively reduces the bacterial load in the wound, removes impediments to healing, allows for better assessment of the wound bed, and promotes the formation of healthy granulation tissue.- A. Surgical debridement does not directly improve local circulation; that is the role of revascularization procedures.
- C. While it facilitates new skin growth, this is a secondary effect, not the primary indication.
- D. Surgical debridement is for ulcers, not primarily to prevent Charcot arthropathy.
- E. While debridement helps in initiating systemic antibiotic therapy by improving tissue penetration, the debridement itself is to remove infected/necrotic tissue, not just to enable antibiotics.
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A patient presents with recurrent episodes of pain and swelling in the ankle joint. Arthrography reveals a defect in the superior aspect of the talar dome. Which treatment is typically reserved for large ( >1 cm^2) or deep, symptomatic osteochondral lesions of the talus that have failed conservative management and microfracture?
Correct Answer: C. Autologous osteochondral transplantation (OATS) or autologous chondrocyte implantation (ACI)
Detailed Academic Rationale: For large (>1 cm^2) or deep, symptomatic osteochondral lesions of the talus (OLT) that have failed less invasive treatments like conservative management and bone marrow stimulation techniques (e.g., microfracture, drilling), more advanced cartilage repair strategies are indicated. Autologous osteochondral transplantation (OATS), also known as mosaicplasty, involves transplanting healthy cartilage and bone plugs from a less weight-bearing area to the defect. Autologous chondrocyte implantation (ACI) involves harvesting chondrocytes, culturing them, and then reimplanting them into the defect. Both are sophisticated techniques reserved for larger lesions where simpler methods are unlikely to provide durable results.- A. Arthroscopic debridement alone is typically for smaller lesions or as a preliminary step.
- B. Exostectomy is for bony impingement, not primary OLT.
- D. Steroid injection has very limited, if any, role in OLT treatment.
- E. Fusion of the ankle joint is a salvage procedure for end-stage ankle arthritis, not a primary treatment for OLT.
