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Question 3621

Topic: 8. Foot and Ankle

A professional wide receiver sustains a severe hyperextension injury to his first MTP joint ('turf toe'). MRI demonstrates a complete disruption of the plantar plate with 4 mm of proximal retraction of the sesamoids. Which of the following is an absolute indication for operative repair in turf toe injuries?

. Grade 1 sprain with normal sesamoid position
. Grade 2 sprain with capsular tearing but no retraction
. Grade 3 sprain with >3 mm of sesamoid retraction
. Chondromalacia of the metatarsal head
. Presence of a bipartite medial sesamoid

Correct Answer & Explanation

. Grade 3 sprain with >3 mm of sesamoid retraction


Explanation

Operative intervention for turf toe (plantar plate rupture) is indicated for Grade 3 injuries with significant instability. Absolute indications include >3 mm of proximal migration of the sesamoids, intra-articular sesamoid fractures with diastasis, or traumatic hallux valgus/varus deformity.

Question 3622

Topic: 8. Foot and Ankle

During the physical examination of a patient with a suspected syndesmotic injury, the examiner stabilizes the tibia and externally rotates the foot. This test primarily stresses which of the following syndesmotic ligaments?

. Anterior inferior tibiofibular ligament (AITFL)
. Posterior inferior tibiofibular ligament (PITFL)
. Transverse tibiofibular ligament
. Interosseous membrane
. Calcaneofibular ligament

Correct Answer & Explanation

. Anterior inferior tibiofibular ligament (AITFL)


Explanation

External rotation of the talus within the mortise pushes the fibula laterally and posteriorly, placing the greatest initial stress on the anterior inferior tibiofibular ligament (AITFL), making it the most frequently injured component of the syndesmosis.

Question 3623

Topic: 8. Foot and Ankle

A 58-year-old male with long-standing, poorly controlled type 2 diabetes presents with a red, hot, swollen right foot. He denies any recent trauma or systemic symptoms. White blood cell count and ESR are normal. Radiographs reveal soft tissue swelling, periarticular osteopenia, and early fragmentation at the tarsometatarsal joints. What is the most appropriate initial management?

. Intravenous antibiotics and urgent surgical debridement
. Immediate open reduction and internal fixation of the midfoot
. Primary midfoot arthrodesis with a rigid plate
. Non-weight-bearing in a total contact cast
. Prescription of a customized functional orthotic

Correct Answer & Explanation

. Non-weight-bearing in a total contact cast


Explanation

This patient has an acute (Eichenholtz Stage I) Charcot neuroarthropathy. The gold standard for initial management is strict immobilization and offloading, typically achieved with a total contact cast, to halt the progression of deformity until the active inflammatory phase resolves.

Question 3624

Topic: Forefoot

A 40-year-old female presents with a painful bunion. Clinical examination and weight-bearing radiographs demonstrate a hallux valgus angle (HVA) of 28 degrees and an intermetatarsal angle (IMA) of 11 degrees. The first tarsometatarsal joint shows no hypermobility. Which of the following procedures is most appropriate?

. Lapidus procedure (First TMT arthrodesis)
. Distal chevron osteotomy
. Proximal crescentic osteotomy
. Keller arthroplasty
. Akin osteotomy alone

Correct Answer & Explanation

. Distal chevron osteotomy


Explanation

A distal chevron osteotomy is indicated for mild-to-moderate hallux valgus deformities (HVA < 30-40 degrees, IMA < 13 degrees) without first ray hypermobility. More severe deformities or those with hypermobility typically require proximal procedures or a Lapidus fusion.

Question 3625

Topic: Forefoot

A 35-year-old woman complains of burning pain in the plantar aspect of her forefoot that radiates into her third and fourth toes. Symptoms worsen with tight shoes and improve when barefoot. A Mulder's click is present. Which of the following best describes the underlying histologic pathology of her condition?

. Proliferation of atypical Schwann cells
. Malignant degeneration of a peripheral nerve sheath
. Perineural fibrosis and nerve degeneration
. Granulomatous inflammation of the plantar fascia
. Crystal deposition within the flexor tendon sheath

Correct Answer & Explanation

. Perineural fibrosis and nerve degeneration


Explanation

The patient has a Morton's neuroma, most commonly occurring in the third webspace. Histologically, it is not a true neoplasm but rather a compressive neuropathy characterized by perineural fibrosis, local vascular changes, and degeneration of the nerve fibers.

Question 3626

Topic: 8. Foot and Ankle

A 32-year-old male sustains an acute Achilles tendon rupture. He is managed with a functional rehabilitation protocol. Compared to surgical repair, which of the following is true regarding his expected outcome?

. Higher risk of deep infection
. Higher re-rupture rate with functional rehab
. Similar re-rupture rate but lower wound complication risk
. Decreased plantarflexion strength at 1 year
. Higher risk of sural nerve injury

Correct Answer & Explanation

. Similar re-rupture rate but lower wound complication risk


Explanation

Recent literature shows that functional rehabilitation for acute Achilles ruptures yields similar re-rupture rates compared to surgical repair, while completely avoiding surgical wound complications.

Question 3627

Topic: 8. Foot and Ankle

A 24-year-old football player sustains an axial load injury to a plantarflexed foot. Clinical examination reveals plantar ecchymosis. Weight-bearing radiographs demonstrate a 3 mm diastasis between the base of the first and second metatarsals. What is the most appropriate surgical management for a purely ligamentous injury in this patient?

. Closed reduction and casting
. Open reduction and internal fixation with transarticular screws
. Primary arthrodesis of the first, second, and third tarsometatarsal joints
. Spanning external fixation
. Percutaneous K-wire fixation

Correct Answer & Explanation

. Primary arthrodesis of the first, second, and third tarsometatarsal joints


Explanation

Primary arthrodesis for purely ligamentous Lisfranc injuries has been shown to yield better functional outcomes and lower reoperation rates compared to open reduction and internal fixation (ORIF).

Question 3628

Topic: 8. Foot and Ankle

A 55-year-old woman presents with medial ankle pain and a progressive flatfoot deformity. She can perform a single-leg heel rise but it is painful and accompanied by hindfoot valgus. On examination, the deformity is entirely flexible. Which of the following procedures is most appropriate?

. Ankle arthrodesis
. Subtalar arthrodesis
. Flexor digitorum longus transfer and medial displacement calcaneal osteotomy
. Triple arthrodesis
. Gastrocnemius recession alone

Correct Answer & Explanation

. Flexor digitorum longus transfer and medial displacement calcaneal osteotomy


Explanation

This patient has Stage II posterior tibial tendon dysfunction characterized by a flexible deformity. The gold standard surgical treatment involves a flatfoot reconstruction, typically an FDL transfer combined with a calcaneal osteotomy.

Question 3629

Topic: 8. Foot and Ankle

During open reduction and internal fixation of a pronation-external rotation ankle fracture, the syndesmosis is found to be unstable after fibular fixation. Two trans-syndesmotic screws are placed. According to recent evidence, what is the recommendation regarding routine removal of these screws?

. Must be removed at 6 weeks prior to weight-bearing
. Must be removed at 12 weeks
. Should be removed only if they cause symptomatic irritation
. Removal is required to restore normal ankle dorsiflexion
. Should be replaced with a suture button device at 3 months

Correct Answer & Explanation

. Should be removed only if they cause symptomatic irritation


Explanation

Routine removal of asymptomatic syndesmotic screws is no longer recommended. Retained or broken screws do not significantly worsen clinical outcomes, and elective removal carries unnecessary surgical risks.

Question 3630

Topic: 8. Foot and Ankle

A 60-year-old diabetic male presents with a red, hot, swollen unilateral foot. There are no open ulcers. To clinically differentiate acute Charcot arthropathy from a deep infection, which of the following bedside tests is most useful?

. Monofilament testing
. Tuning fork test
. Elevation of the leg for 10 minutes
. Dependent rubor test
. Tinel's sign over the tarsal tunnel

Correct Answer & Explanation

. Elevation of the leg for 10 minutes


Explanation

Elevating the leg for 5 to 10 minutes will typically result in a decrease in erythema in acute Charcot arthropathy. Conversely, erythema caused by acute infection will persist despite elevation.

Question 3631

Topic: Forefoot

A 45-year-old woman presents with a symptomatic hallux valgus deformity. Radiographs show a hallux valgus angle (HVA) of 26 degrees and an intermetatarsal angle (IMA) of 11 degrees. Clinical examination reveals hypermobility of the first tarsometatarsal joint. What is the most appropriate surgical procedure?

. Distal chevron osteotomy
. Proximal crescentic osteotomy
. Lapidus procedure (first tarsometatarsal arthrodesis)
. Akin osteotomy alone
. Keller resection arthroplasty

Correct Answer & Explanation

. Lapidus procedure (first tarsometatarsal arthrodesis)


Explanation

While a distal chevron osteotomy is suitable for mild deformities, the presence of first ray hypermobility necessitates a Lapidus procedure (first TMT arthrodesis) to prevent recurrence and fully correct the deformity.

Question 3632

Topic: Forefoot

A 60-year-old man complains of severe pain and stiffness in his right great toe. Examination reveals less than 10 degrees of dorsiflexion with pain throughout the entire range of motion. Radiographs show joint space obliteration and large dorsal osteophytes of the first MTP joint. What is the most reliable surgical treatment for pain relief?

. Dorsal cheilectomy
. Moberg osteotomy
. First MTP joint arthrodesis
. Keller arthroplasty
. Silicone implant arthroplasty

Correct Answer & Explanation

. First MTP joint arthrodesis


Explanation

For advanced (Grade 3 or 4) hallux rigidus with pain throughout the range of motion and joint space obliteration, first MTP arthrodesis provides the most reliable, durable, and functional pain relief.

Question 3633

Topic: Midfoot & Hindfoot

A 55-year-old female presents with progressive medial ankle pain and a severe flatfoot deformity. Examination reveals a flexible hindfoot and forefoot abduction with greater than 30 percent talonavicular uncoverage on weight-bearing radiographs. She cannot perform a single-leg heel rise. What is the most appropriate surgical management for this Stage IIb adult acquired flatfoot deformity?

. Medial displacement calcaneal osteotomy and flexor digitorum longus transfer
. Lateral column lengthening, medial displacement calcaneal osteotomy, and flexor digitorum longus transfer
. Isolated triple arthrodesis
. Isolated subtalar arthrodesis
. Gastrocnemius recession and spring ligament repair alone

Correct Answer & Explanation

. Lateral column lengthening, medial displacement calcaneal osteotomy, and flexor digitorum longus transfer


Explanation

Stage IIb posterior tibial tendon dysfunction is characterized by a flexible hindfoot with significant forefoot abduction (greater than 30% talonavicular uncoverage). Lateral column lengthening is necessary to correct the severe forefoot abduction and restore talonavicular joint alignment, combined with a medial displacement calcaneal osteotomy and FDL transfer.

Question 3634

Topic: 8. Foot and Ankle

A 22-year-old collegiate football player sustains a hyperplantarflexion injury to his midfoot. He complains of severe midfoot pain and inability to bear weight. Non-weight-bearing radiographs of the foot appear completely normal. What is the most appropriate next step in confirming the diagnosis of a subtle Lisfranc injury?

. Non-weight-bearing CT scan of the foot
. Ultrasound of the dorsal midfoot
. Weight-bearing radiographs of the foot
. Tc-99m bone scan
. Immediate diagnostic arthroscopy of the tarsometatarsal joints

Correct Answer & Explanation

. Weight-bearing radiographs of the foot


Explanation

Weight-bearing radiographs are the essential next initial step to provoke and demonstrate subtle diastasis or instability at the Lisfranc (tarsometatarsal) articulation when non-weight-bearing films are negative. If weight-bearing films remain equivocal, an MRI or weight-bearing CT is indicated.

Question 3635

Topic: 8. Foot and Ankle

A 40-year-old male is undergoing a percutaneous repair of an acute Achilles tendon rupture. During the passage of sutures in the proximal aspect of the tendon, which nerve is at the greatest risk of iatrogenic injury, and what is its typical anatomical relationship to the tendon?

. Tibial nerve, lying immediately medial to the tendon
. Sural nerve, crossing the lateral border of the tendon 10 to 12 cm proximal to the insertion
. Sural nerve, lying medial to the tendon 2 cm proximal to the insertion
. Saphenous nerve, crossing the medial border 5 cm proximal to the insertion
. Deep peroneal nerve, lying directly anterior to the tendon

Correct Answer & Explanation

. Sural nerve, crossing the lateral border of the tendon 10 to 12 cm proximal to the insertion


Explanation

The sural nerve crosses the lateral border of the Achilles tendon roughly 10 to 12 cm proximal to its calcaneal insertion. This anatomical path places it at significant risk of capture or injury during percutaneous or minimally invasive Achilles repairs.

Question 3636

Topic: Midfoot & Hindfoot
A 35-year-old male presents after a high-speed motor vehicle collision with a displaced talar neck fracture. Radiographs confirm a Hawkins Type III injury. By definition, this classification indicates dislocation or subluxation of which of the following joints?
. Subtalar joint only
. Tibiotalar joint only
. Subtalar and tibiotalar joints
. Subtalar, tibiotalar, and talonavicular joints
. Calcaneocuboid and talonavicular joints

Correct Answer & Explanation

. Subtalar and tibiotalar joints


Explanation

The Hawkins classification for talar neck fractures is based on displacement. Type I is nondisplaced; Type II involves subtalar subluxation/dislocation; Type III involves both subtalar and tibiotalar dislocation; Type IV adds talonavicular dislocation.

Question 3637

Topic: 8. Foot and Ankle

When performing open reduction and internal fixation of a displaced intra-articular calcaneus fracture with a flattened Bohler angle, what is the primary biomechanical and anatomical goal of the reconstruction?

. Restore subtalar joint congruity, calcaneal height, and reduce lateral wall blowout
. Perform a primary subtalar arthrodesis to prevent post-traumatic arthritis
. Lengthen the Achilles tendon to neutralize deforming forces
. Restore talonavicular alignment and medial column length
. Excise comminuted articular fragments and interpose a fat pad

Correct Answer & Explanation

. Restore subtalar joint congruity, calcaneal height, and reduce lateral wall blowout


Explanation

The primary goals of calcaneal ORIF are anatomical restoration of the posterior facet congruity, restoration of calcaneal height (Bohler's angle), and reduction of calcaneal width (lateral wall blowout) to prevent subfibular impingement.

Question 3638

Topic: Forefoot

A 45-year-old female presents with a painful bunion. Radiographs reveal a hallux valgus angle (HVA) of 45 degrees, an intermetatarsal angle (IMA) of 18 degrees, and obvious hypermobility at the first tarsometatarsal (TMT) joint on clinical exam. What is the most appropriate surgical intervention?

. Distal chevron osteotomy
. Proximal crescentic osteotomy without fusion
. First TMT arthrodesis (Lapidus procedure) with distal soft tissue release
. First metatarsophalangeal joint arthrodesis
. Keller arthroplasty

Correct Answer & Explanation

. First TMT arthrodesis (Lapidus procedure) with distal soft tissue release


Explanation

In the setting of a severe hallux valgus deformity (IMA greater than 15 degrees) complicated by first ray hypermobility, a first TMT arthrodesis (Lapidus procedure) provides optimal multiplanar correction and restores stability to the medial column.

Question 3639

Topic: 8. Foot and Ankle

A 28-year-old downhill skier sustains an acute lateral ankle injury characterized by a popping sensation and subsequent retromalleolar pain. Examination reveals a subluxating peroneus brevis tendon. What is the most common mechanism of injury leading to acute disruption of the superior peroneal retinaculum (SPR)?

. Sudden plantarflexion and inversion of the ankle
. Sudden dorsiflexion and inversion of the ankle
. Sudden dorsiflexion and eversion of the ankle with forceful contraction of the peroneal muscles
. Plantarflexion and internal rotation of the foot
. Direct axial load on a maximally plantarflexed foot

Correct Answer & Explanation

. Sudden dorsiflexion and eversion of the ankle with forceful contraction of the peroneal muscles


Explanation

Acute tears of the superior peroneal retinaculum typically occur from sudden dorsiflexion and eversion of the ankle while the peroneal muscles are undergoing a strong reflexive eccentric contraction.

Question 3640

Topic: 8. Foot and Ankle

A 60-year-old male with poorly controlled diabetes presents with a unilaterally red, hot, and swollen foot. There is no open ulceration. Radiographs show early bone fragmentation and joint subluxation at the tarsometatarsal joints. Inflammatory markers are mildly elevated. What is the most appropriate initial management?

. Immediate open reduction and internal fixation of the midfoot
. Intravenous antibiotics and emergent surgical debridement
. Total contact casting and strict non-weight-bearing
. Midfoot arthrodesis with robust intramedullary hardware
. Below-knee amputation

Correct Answer & Explanation

. Total contact casting and strict non-weight-bearing


Explanation

This presentation is characteristic of acute Eichenholtz stage I (fragmentation stage) Charcot neuroarthropathy. The gold standard for initial management is strict immobilization and offloading using a total contact cast to arrest deformity progression until the acute inflammatory phase resolves.