8. Foot and Ankle MCQs

When performing an extensive external fixation lengthening of the tibia, what is the most common adjacent joint complication that often necessitates extending the frame across the joint?

A 22-year-old basketball player sustains an acute ankle sprain. Clinical examination reveals laxity with the anterior drawer test of the ankle. The most commonly injured ligament in this scenario is primarily under maximal tension in which of the following foot positions?

A 22-year-old basketball player lands awkwardly on another player's foot, sustaining a severe inversion injury to his right ankle. He presents with localized swelling and ecchymosis over the anterolateral aspect of the ankle. An anterior drawer test of the ankle is positive. Which of the following ligaments is most likely ruptured?

Acute ruptures of the Achilles tendon most frequently occur in its vascular "watershed" zone. Anatomically, approximately how far proximal to the superior tuberosity of the calcaneus is this susceptible region located?

A 55-year-old male with long-standing, poorly controlled diabetes presents with a swollen, erythematous, and warm left foot. Radiographs reveal fragmentation of the tarsometatarsal joints, periarticular debris, and subluxation. There are no open ulcers. What is the most appropriate initial management?

A 30-year-old woman presents with severe midfoot pain after missing a step and forcefully plantarflexing her foot. Weight-bearing radiographs show a 3 mm widening between the bases of the 1st and 2nd metatarsals. Which anatomic structure provides the primary stabilizing force against this specific lateral displacement?

Dysplasia Epiphysealis Hemimelica (Trevor disease) is characterized by an asymmetric cartilage overgrowth that histologically resembles an osteochondroma. Which of the following is the most common anatomical location for this lesion?

A 42-year-old male presents to the emergency department after feeling a "pop" in his posterior ankle while playing basketball. He has weakness with plantar flexion and a palpable gap 4 cm proximal to the calcaneal insertion. The Thompson test is positive. If the patient elects for nonoperative management, which of the following is the most critical component of the early rehabilitation protocol to optimize tendon healing and minimize the risk of re-rupture?

A 42-year-old male presents with a palpable gap in his posterior ankle and a positive Thompson test after feeling a "pop" while playing basketball. He is diagnosed with an acute Achilles tendon rupture. The rupture most commonly occurs in a hypovascular zone. How far proximal to the calcaneal insertion is this watershed area typically located?

A 55-year-old diabetic patient presents with a swollen, red, and warm left foot. Radiographs show joint fragmentation, debris, and early subluxation at the midfoot, consistent with Eichenholtz Stage I Charcot arthropathy. There is no open ulcer. What is the most appropriate initial management?

A 22-year-old football player sustains a high-energy axial load to a plantarflexed foot. Imaging confirms a purely ligamentous Lisfranc injury. During surgical reconstruction, the surgeon must restore the anatomical function of the Lisfranc ligament. What are its true anatomical attachments?

A 25-year-old male lands awkwardly on his midfoot while playing rugby. Examination reveals pronounced plantar midfoot ecchymosis and severe pain with pronation and abduction of the forefoot. Weight-bearing radiographs demonstrate a "fleck sign" and 3 mm of widening between the medial cuneiform and the base of the second metatarsal. The primary restraining ligament injured in this condition connects which two osseous structures?

During gradual tibial lengthening using a circular external fixator, the patient develops a progressive equinus deformity of the ankle. What is the most common underlying cause of this specific complication?

During a proximal tibial lengthening procedure, a patient acutely develops an inability to actively dorsiflex the ankle and extend the great toe. Which structure is compromised, and what is the immediate initial management?

On a weight-bearing long leg radiograph, the mechanical axis deviation (MAD) is measured in a patient with a severe varus thrust during gait. Where does the mechanical axis line typically pass relative to the knee center in this patient?

A 5-year-old child is evaluated for asymmetric swelling and restricted motion of the medial aspect of the ankle. Radiographs show an osteochondromatous overgrowth arising from the medial epiphysis of the talus. What is the most likely diagnosis?

A 10-year-old boy presents with marked hypertrophy of his left leg compared to his right. Examination reveals a large, lateral cutaneous capillary malformation (port-wine stain) extending from the hip to the foot, along with prominent superficial varicosities. Which of the following is the most likely diagnosis?

A 5-year-old boy presents with isolated, disproportionate overgrowth of the 2nd and 3rd toes of his left foot, accompanied by thick plantar soft tissue. Which nerve territory is classically involved and hypertrophied in this specific pedal presentation?

In a patient presenting with an isolated paresis of the tibialis anterior, which of the following gait abnormalities is most likely to be observed during the loading response phase?

During the terminal stance phase of normal gait, what is the anatomical relationship of the ground reaction force (GRF) vector relative to the major joints of the lower extremity?