8. Foot and Ankle MCQs

The pathogenesis of Charcot arthropathy involves multiple factors. The 'French theory' of Charcot pathogenesis specifically emphasizes which of the following mechanisms?

A diabetic patient presents with a red, hot, swollen foot. Radiographs show joint debris, fragmentation of subchondral bone, and subluxation, but no signs of consolidation. According to the Eichenholtz classification, what is the most appropriate initial management?

The "neurovascular theory" of Charcot neuropathic arthropathy pathogenesis primarily implicates which of the following mechanisms?

A 55-year-old man with poorly controlled type 2 diabetes presents with a red, hot, swollen right foot. He denies fevers or chills. Plain radiographs show early fragmentation of the tarsometatarsal joints without frank dislocation. Elevating the leg for 10 minutes leads to a significant decrease in erythema. What is the most appropriate next step in management?

A 55-year-old diabetic male presents with an acutely swollen, erythematous, and warm right foot. He is afebrile and his pedal pulses are bounding. Radiographs show soft tissue swelling and early bony fragmentation of the midfoot without ulceration. What is the best initial management?

A 42-year-old man presents with painless, massive swelling and crepitus of his right shoulder. Radiographs demonstrate severe destruction of the humeral head and glenoid with multiple bony fragments. Which underlying condition is most likely responsible?

A 55-year-old diabetic patient presents with a warm, swollen, erythematous foot. Radiographs show periarticular debris, fragmentation, and joint subluxation. According to the Eichenholtz classification, what is the current stage of this neuropathic arthropathy and the corresponding initial management?

A 55-year-old man with long-standing, poorly controlled diabetes presents with a swollen, erythematous, and warm left foot. He denies pain or recent trauma. Radiographs show osseous fragmentation, joint subluxation, and debris around the midfoot. What is the most appropriate initial management?

A newborn is evaluated in the NICU and noted to have very short limbs, rigid equinovarus foot deformities, 'hitchhiker' thumbs, and cystic swelling of the external ear. The genetic mutation causing this dysplasia affects which of the following?

A 45-year-old male presents with rapid, painless swelling and severe joint destruction of his right shoulder. Neurological examination reveals a loss of pain and temperature sensation in his upper extremities but preserved light touch and proprioception. Which of the following is the most likely underlying diagnosis?

Neuropathic arthropathy in the upper extremity associated with syringomyelia is primarily secondary to the destruction of which of the following spinal cord structures?

A physical exam finding commonly associated with the presence of a syrinx in a pediatric patient with scoliosis, often prompting an MRI even before sensory changes are noticed, is which of the following?

A 35-year-old male sustains a gunshot wound to the posterolateral leg resulting in a partial transection of the common peroneal nerve. Weeks later, he develops severe, burning pain in the foot, hyperalgesia, and trophic skin changes.

Which of the following features specifically distinguishes his condition as Complex Regional Pain Syndrome (CRPS) Type II rather than Type I?

A 60-year-old female presents with glossy skin, joint stiffness, and severe allodynia in her foot 3 months after a treated ankle fracture.

Which of the following findings is most likely to be seen on a triple-phase bone scan in the late stages (Stage 3) of this condition?

A 45-year-old female runner complains of burning pain and tingling in the plantar aspect of her foot, which worsens with activity. Examination reveals a positive Tinel's sign posterior to the medial malleolus. During surgical release of the flexor retinaculum for this condition, which of the following structures is located immediately anterior to the tibial nerve within the tarsal tunnel?

A 42-year-old marathon runner presents with burning pain and tingling in the plantar aspect of his right foot, which worsens with prolonged standing. Tinel's sign is positive posterior to the medial malleolus. Which of the following structures forms the roof of the anatomical tunnel implicated in this patient's condition?

A 4-year-old boy presents with congenital bilateral hallux valgus and short first metatarsals. He recently developed painful, firm soft tissue swellings over his back following a minor fall, which subsequently ossified. A mutation in the ACVR1 gene is suspected. Which of the following interventions is strictly contraindicated in this patient?

A 45-year-old female presents with burning pain and tingling in the plantar aspect of her foot, which worsens with prolonged standing. Tinel's sign is positive posterior to the medial malleolus. She is diagnosed with Tarsal Tunnel Syndrome. Which of the following structures forms the roof of the tarsal tunnel?

A 14-year-old boy presents with recurrent ankle sprains and a rigid flatfoot. On physical examination, there is restricted subtalar motion and spasm of the peroneal muscles. Radiographs reveal an 'anteater nose' sign. Which of the following is the most likely diagnosis?

During the Ponseti method of casting for a newborn with idiopathic clubfoot, the sequence of correction is critical. After correcting the cavus deformity by elevating the first ray, what is the next step in the manipulative correction process?