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Midfoot & Hindfoot MCQs

Practice Set 37 of 39

This practice set contains high-yield board review questions covering key concepts in Midfoot & Hindfoot. Each clinical scenario is designed to test your diagnostic and management skills relevant to this subspecialty.

Question 721

Topic: Midfoot & Hindfoot
A patient with diabetes mellitus and peripheral neuropathy presents with a warm, swollen, and erythematous foot. Radiographs reveal absorption of fine bone debris, early sclerosis, and fusion of the tarsometatarsal joints. According to the Eichenholtz classification of Charcot arthropathy, this represents which stage?
. Stage 0 (Prodromal)
. Stage I (Developmental/Fragmentation)
. Stage II (Coalescence)
. Stage III (Reconstruction/Consolidation)
. Stage IV (Chronic ulceration)

Correct Answer & Explanation

. Stage II (Coalescence)

Explanation

The Eichenholtz classification describes the natural history of Charcot arthropathy. Stage II (Coalescence) is characterized by decreased warmth/swelling clinically, and radiographically by the absorption of fine intra-articular debris, early sclerosis, and fusion of large fragments. Stage I (Fragmentation) shows active debris formation, subluxation, and fracture. Stage III (Consolidation) shows mature bony remodeling, rounded bone ends, and stable deformity.

Question 722

Topic: Midfoot & Hindfoot

A diabetic patient presents with a swollen, erythematous foot and a rocker-bottom deformity. Radiographs show bone fragmentation, periarticular debris, and joint subluxation. What Eichenholtz stage of Charcot arthropathy does this represent?

. Stage 0 (Inflammatory)
. Stage 1 (Developmental/Fragmentation)
. Stage 2 (Coalescence)
. Stage 3 (Reconstruction/Consolidation)
. Stage 4 (Resolution)

Correct Answer & Explanation

. Stage 1 (Developmental/Fragmentation)

Explanation

Eichenholtz Stage 1 (Developmental/Fragmentation) is characterized by acute inflammation, osteopenia, bone fragmentation, and joint subluxation. Stage 2 involves coalescence of fragments, while Stage 3 is the consolidation and remodeling phase.

Question 723

Topic: Midfoot & Hindfoot

A 55-year-old diabetic patient presents with a swollen, erythematous, and warm foot without systemic signs of infection. Radiographs show periarticular debris, fragmentation, and subluxation of the midfoot. According to the Eichenholtz classification, what is the most appropriate initial management for this stage?

. Immediate open reduction and internal fixation
. Total contact casting and non-weight bearing
. Below-knee amputation
. Intravenous antibiotics
. Custom orthotic shoe wear only

Correct Answer & Explanation

. Total contact casting and non-weight bearing

Explanation

The patient is in Eichenholtz Stage I (Developmental/Fragmentation) of Charcot arthropathy. The standard of care is immediate immobilization with a total contact cast and strict non-weight bearing to prevent further deformity until the acute inflammatory phase resolves.

Question 724

Topic: Midfoot & Hindfoot
A 55-year-old patient with long-standing diabetes presents with a swollen, erythematous, and warm foot. Radiographs show periarticular fragmentation, debris, and subluxation at the tarsometatarsal joints. According to the Eichenholtz classification, what stage is this Charcot arthropathy?
. Stage 0
. Stage I
. Stage II
. Stage III
. Stage IV

Correct Answer & Explanation

. Stage I

Explanation

Eichenholtz Stage I (Development/Fragmentation) is characterized clinically by a red, hot, swollen foot and radiographically by bone fragmentation, joint debris, subluxation/dislocation, and loss of joint space. Stage 0 is characterized by clinical warmth/swelling with normal radiographs. Stage II is coalescence, and Stage III is consolidation/remodeling.

Question 725

Topic: Midfoot & Hindfoot
A 55-year-old female presents with medial foot pain and inability to perform a single-leg heel rise. Examination shows a flexible hindfoot valgus and forefoot abduction. AP radiographs show 40% uncoverage of the talonavicular joint head. Which of the following surgical interventions is most appropriate for this stage IIb adult-acquired flatfoot deformity?
. Triple arthrodesis
. Talonavicular arthrodesis alone
. Flexor digitorum longus (FDL) transfer and medial displacement calcaneal osteotomy (MDCO)
. FDL transfer, MDCO, and lateral column lengthening
. Subtalar arthrodesis

Correct Answer & Explanation

. FDL transfer, MDCO, and lateral column lengthening

Explanation

The patient has a Stage IIb adult-acquired flatfoot deformity (tibialis posterior tendon dysfunction). Stage II indicates a flexible deformity. Stage IIb specifically denotes significant forefoot abduction (typically >30% talonavicular uncoverage). Treatment requires a soft tissue reconstruction (FDL transfer), correction of hindfoot valgus (MDCO), and correction of forefoot abduction (lateral column lengthening, such as an Evans osteotomy). A triple arthrodesis is reserved for Stage III (rigid) deformity.

Question 726

Topic: Midfoot & Hindfoot

A 58-year-old male with long-standing, poorly controlled diabetes presents with a swollen, red, and warm right foot for 3 weeks. He denies systemic symptoms, and there are no open ulcers. Radiographs show periarticular debris, fragmentation, and subluxation of the midfoot joints. What is the most appropriate initial management?

. Intravenous antibiotics and surgical debridement
. Total contact casting and strict non-weight-bearing
. Primary arthrodesis of the midfoot
. Corticosteroid injection into the affected joints
. Prescription of custom orthotic shoes

Correct Answer & Explanation

. Total contact casting and strict non-weight-bearing

Explanation

The clinical and radiographic presentation is classic for Eichenholtz Stage I (Fragmentation) Charcot arthropathy. The gold standard for initial management in the absence of an open wound or active infection is immobilization and offloading, typically using a total contact cast.

Question 727

Topic: Midfoot & Hindfoot

A 55-year-old diabetic male presents with an acutely swollen, erythematous, and warm right foot without open wounds or signs of systemic infection. Radiographs reveal midfoot osteopenia and early fragmentation of the tarsometatarsal joints. Which treatment is most appropriate at this stage?

. Intravenous antibiotics and urgent debridement
. Total contact casting and strict non-weight bearing
. Midfoot arthrodesis with rigid internal fixation
. Transmetatarsal amputation
. Observation and custom accommodative orthotics

Correct Answer & Explanation

. Total contact casting and strict non-weight bearing

Explanation

The patient is in the acute fragmentation phase (Stage 1) of Eichenholtz Charcot arthropathy. The gold standard treatment during this acute, hyperemic phase is immobilization and offloading, typically achieved using a total contact cast.

Question 728

Topic: Midfoot & Hindfoot

In the pathogenesis of Charcot neuropathic osteoarthropathy in diabetic patients, the 'neurovascular theory' suggests that autonomic neuropathy drives the disease process through which of the following mechanisms?

. Decreased local capillary blood flow causing focal avascular necrosis
. Increased subchondral bone density due to primary decreased osteoclast activity
. Loss of sympathetic tone resulting in localized hyperemia and active bone resorption
. Microvascular thrombosis of nutrient arteries leading to structural collapse
. Decreased neuropeptide release directly inhibiting the inflammatory cascade

Correct Answer & Explanation

. Loss of sympathetic tone resulting in localized hyperemia and active bone resorption

Explanation

The neurovascular theory of Charcot arthropathy postulates that autonomic neuropathy leads to a loss of sympathetic vascular tone in the extremity. This results in significant arteriovenous shunting and localized hyperemia. The increased blood flow 'washes out' bone by enhancing osteoclastic bone resorption, weakening the architecture and predisposing the bone to microfractures and ultimate collapse.

Question 729

Topic: Midfoot & Hindfoot

A 55-year-old overweight female presents with progressive flattening of her left medial longitudinal arch and pain behind the medial malleolus. She is unable to perform a single-leg heel rise on the left. Her hindfoot is in valgus but is flexible and corrects when she stands on her toes on both feet. What is the most appropriate surgical management for this stage of posterior tibial tendon dysfunction (PTTD)?

. Gastrocnemius recession and orthotics
. Flexor digitorum longus (FDL) transfer to the navicular and medializing calcaneal osteotomy
. Subtalar arthrodesis
. Triple arthrodesis
. Tibiotalocalcaneal (TTC) arthrodesis

Correct Answer & Explanation

. Flexor digitorum longus (FDL) transfer to the navicular and medializing calcaneal osteotomy

Explanation

The patient has Stage II PTTD (flatfoot deformity that is flexible, indicated by hindfoot correction on toe rise, but inability to perform a single heel rise due to incompetent PTT). The gold standard surgical treatment for Stage II includes a joint-sparing procedure: FDL transfer (to replace the PTT) combined with a medializing calcaneal osteotomy (to correct the valgus and restore biomechanical axes).

Question 730

Topic: Midfoot & Hindfoot

In adult-acquired flatfoot deformity secondary to posterior tibial tendon dysfunction (PTTD), progressive collapse of the medial longitudinal arch occurs. What primary structural failure leads directly to talonavicular uncoverage and significant forefoot abduction?

. Rupture of the anterior talofibular ligament
. Attenuation of the spring (calcaneonavicular) ligament
. Contracture of the Achilles tendon
. Tear of the peroneal brevis tendon
. Degeneration of the plantar fascia

Correct Answer & Explanation

. Attenuation of the spring (calcaneonavicular) ligament

Explanation

The posterior tibial tendon acts as the primary dynamic stabilizer of the arch. When it fails, excessive stress is transferred to the static stabilizers, particularly the spring (calcaneonavicular) ligament, leading to its attenuation and subsequent plantarflexion/medial rotation of the talar head.

Question 731

Topic: Midfoot & Hindfoot

A 22-year-old rugby player sustains a purely ligamentous Lisfranc injury with dynamic instability demonstrated on weight-bearing radiographs. Which surgical intervention is associated with the best long-term functional outcome for purely ligamentous variants?

. Closed reduction and percutaneous pinning with K-wires
. Open reduction and internal fixation with transarticular screws
. Primary arthrodesis of the first, second, and third tarsometatarsal joints
. Dorsal bridge plating spanning the midfoot
. Ligamentous reconstruction using a plantaris autograft

Correct Answer & Explanation

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

Explanation

Evidence suggests that primary arthrodesis yields superior long-term outcomes and lower revision rates compared to open reduction and internal fixation (ORIF) for purely ligamentous Lisfranc injuries. ORIF is generally preferred for purely bony variants.

Question 732

Topic: Midfoot & Hindfoot
A 62-year-old woman with a history of medial ankle pain presents with a rigid, non-reducible flatfoot deformity. She has severe pain in the subfibular region. Radiographs demonstrate talonavicular and subtalar arthritis with severe talonavicular uncoverage. Conservative management has failed. What is the most appropriate surgical intervention?
. Flexor digitorum longus transfer and medial displacement calcaneal osteotomy
. Lateral column lengthening and gastrocnemius recession
. Triple arthrodesis
. Subtalar arthrodesis
. Spring ligament reconstruction

Correct Answer & Explanation

. Triple arthrodesis

Explanation

The patient presents with Stage III posterior tibial tendon dysfunction (PTTD), which is characterized by a rigid, non-reducible flatfoot deformity and degenerative changes in the subtalar and/or talonavicular joints. The presence of subfibular pain indicates lateral impingement due to severe hindfoot valgus. The appropriate surgical management for a rigid deformity with arthritic changes is a triple arthrodesis (fusion of the subtalar, talonavicular, and calcaneocuboid joints) to correct the deformity and relieve pain. FDL transfer and calcaneal osteotomy are indicated for Stage II (flexible) deformity without significant arthritis.

Question 733

Topic: Midfoot & Hindfoot
A 55-year-old woman presents with a progressive flatfoot deformity. Examination reveals a flexible hindfoot valgus and forefoot abduction. She is unable to perform a single-leg heel raise on the affected side. She has failed 6 months of conservative management including a custom ankle-foot orthosis and physical therapy. Which of the following surgical interventions is most appropriate?
. Tenosynovectomy and debridement of the posterior tibial tendon
. Flexor digitorum longus (FDL) transfer and medial displacement calcaneal osteotomy
. Subtalar arthrodesis
. Triple arthrodesis
. Tibiotalocalcaneal arthrodesis

Correct Answer & Explanation

. Flexor digitorum longus (FDL) transfer and medial displacement calcaneal osteotomy

Explanation

This patient has Stage II posterior tibial tendon dysfunction (PTTD), characterized by a flexible flatfoot deformity and the inability to perform a single-leg heel raise. The standard of care for Stage II PTTD that has failed conservative management is a joint-sparing procedure, typically consisting of a flexor digitorum longus (FDL) tendon transfer to the navicular combined with a medial displacement calcaneal osteotomy (MDCO) to correct the mechanical axis of the hindfoot. Tenosynovectomy alone is reserved for Stage I (no deformity, able to heel raise). Triple arthrodesis is indicated for Stage III (rigid deformity).

Question 734

Topic: Midfoot & Hindfoot
A 60-year-old woman presents with chronic pain along the medial aspect of her ankle. Examination reveals tenderness and swelling along the course of the posterior tibial tendon. She is able to perform a single-leg heel raise symmetrically, and there is no flexible or rigid flatfoot deformity present. She has undergone 8 weeks of cast immobilization, nonsteroidal anti-inflammatory drugs (NSAIDs), and physical therapy without significant relief. What is the most appropriate next step in management?
. Flexor digitorum longus transfer and medial displacement calcaneal osteotomy
. Subtalar arthrodesis
. Posterior tibial tendon tenosynovectomy
. Triple arthrodesis
. Spring ligament reconstruction

Correct Answer & Explanation

. Posterior tibial tendon tenosynovectomy

Explanation

This patient presents with Stage I posterior tibial tendon dysfunction (PTTD). Stage I is characterized by pain and swelling along the tendon, no clinical deformity, and the preserved ability to perform a single-leg heel raise. The initial treatment for Stage I PTTD is conservative, including immobilization (cast or boot), orthotics, NSAIDs, and physical therapy. When conservative management fails after an adequate trial (typically 3-6 months), surgical intervention is indicated. For isolated Stage I disease without deformity, a posterior tibial tendon tenosynovectomy is the treatment of choice. Flexor digitorum longus (FDL) transfer and medial displacement calcaneal osteotomy are indicated for Stage II PTTD (flexible flatfoot deformity, inability to perform a single heel raise). Triple arthrodesis is reserved for Stage III PTTD (rigid deformity with subtalar arthrosis).

Question 735

Topic: Midfoot & Hindfoot
A 60-year-old woman presents with a 6-month history of medial ankle pain. Examination reveals tenderness along the course of the posterior tibial tendon, but she is able to perform a single-leg heel raise symmetrically without difficulty. MRI demonstrates tenosynovitis of the posterior tibial tendon without evidence of a tear. She has undergone 8 weeks of cast immobilization, nonsteroidal anti-inflammatory drugs (NSAIDs), and physical therapy, but continues to have debilitating pain. What is the most appropriate next step in management?
. Flexor digitorum longus (FDL) transfer to the navicular
. Medial displacement calcaneal osteotomy
. Tenosynovectomy of the posterior tibial tendon
. Subtalar arthrodesis
. Triple arthrodesis

Correct Answer & Explanation

. Tenosynovectomy of the posterior tibial tendon

Explanation

This patient presents with Stage I posterior tibial tendon dysfunction (PTTD), characterized by pain and swelling along the tendon, tenosynovitis on MRI, but no deformity and an intact ability to perform a single-leg heel raise. Conservative management includes immobilization, custom orthotics, NSAIDs, and physical therapy. When conservative treatment fails after a sufficient trial (typically 3-6 months), surgical intervention is indicated. For Stage I PTTD, a tenosynovectomy with or without tendon debridement is the procedure of choice. FDL transfer and medial displacement calcaneal osteotomy are indicated for Stage II PTTD, which involves a flexible flatfoot deformity and inability to perform a single heel raise. Arthrodesis procedures (subtalar or triple) are reserved for Stage III (rigid deformity) or Stage IV (ankle joint involvement) PTTD.

Question 736

Topic: Midfoot & Hindfoot
A 60-year-old woman presents with medial ankle pain. Examination reveals tenderness along the posterior tibial tendon, but she is able to perform a single-leg heel raise symmetrically. She has undergone 8 weeks of cast immobilization, taken nonsteroidal anti-inflammatory medications, and completed physical therapy without relief. What is the most appropriate next step in management?
. Flexor digitorum longus transfer and medial displacement calcaneal osteotomy
. Triple arthrodesis
. Tenosynovectomy and debridement of the posterior tibial tendon
. Subtalar arthrodesis
. Gastrocnemius recession alone

Correct Answer & Explanation

. Tenosynovectomy and debridement of the posterior tibial tendon

Explanation

This patient presents with Stage I posterior tibial tendon dysfunction (PTTD), characterized by tenosynovitis, normal tendon length, and the ability to perform a single-leg heel raise. The initial treatment for Stage I PTTD is conservative, including immobilization (cast or boot), orthotics, NSAIDs, and physical therapy. When conservative management fails after an adequate trial (typically 3-6 months), surgical intervention is indicated. For Stage I disease, tenosynovectomy and debridement of the posterior tibial tendon is the procedure of choice. Flexor digitorum longus (FDL) transfer and medial displacement calcaneal osteotomy are indicated for Stage II PTTD, where the tendon is elongated and the hindfoot is in a flexible valgus deformity (inability to perform a single heel raise). Triple arthrodesis is reserved for Stage III PTTD, which involves a rigid hindfoot valgus deformity.

Question 737

Topic: Midfoot & Hindfoot

A 55-year-old male with poorly controlled diabetes presents with a red, warm, and swollen right foot. He has no open ulcers. Radiographs reveal fragmentation, periarticular debris, and subluxation of the tarsometatarsal joints. Which of the following is the most appropriate initial management?

. Total contact casting and non-weight bearing
. Intravenous antibiotics and surgical debridement
. Primary arthrodesis of the midfoot
. Below-knee amputation
. Corticosteroid injection into the affected joints

Correct Answer & Explanation

. Total contact casting and non-weight bearing

Explanation

The patient has an acute (Eichenholtz Stage 1) Charcot arthropathy. The mainstay of initial treatment is offloading and immobilization, typically achieved with a total contact cast, to prevent further deformity while the acute inflammation subsides.

Question 738

Topic: Midfoot & Hindfoot

A 59-year-old female with a history of Charcot arthropathy presents with a stable, rigid rocker-bottom deformity of her left foot. She has a recurrent ulcer on the plantar aspect of the midfoot over a bony prominence, despite compliant use of a CROW (Charcot Restraint Orthotic Walker) boot. There are no signs of acute infection. What is the most appropriate surgical management?

. Below-knee amputation
. Exostectomy of the bony prominence
. Arthrodesis of the midfoot
. Application of a circular external fixator
. Split-thickness skin grafting of the ulcer

Correct Answer & Explanation

. Exostectomy of the bony prominence

Explanation

Correct Answer: BIn a patient with a stable, rigid Charcot deformity (Eichenholtz Stage 3) who develops a recurrent ulcer over a bony prominence despite maximal conservative offloading (like a CROW boot), an exostectomy (shaving down the bony prominence) is the most appropriate surgical intervention. Arthrodesis or osteotomy is generally reserved for unstable deformities or when exostectomy is insufficient. Amputation is a last resort for uncontrollable infection or non-reconstructable, non-braceable limbs.

Question 739

Topic: Midfoot & Hindfoot

A 54-year-old male with a 20-year history of diabetes mellitus is diagnosed with Charcot arthropathy. Which of the following anatomic locations is most frequently affected by Charcot arthropathy in diabetic patients?

. Ankle joint (tibiotalar)
. Hindfoot (subtalar joint)
. Midfoot (tarsometatarsal / Lisfranc joint)
. Forefoot (metatarsophalangeal joints)
. Knee joint

Correct Answer & Explanation

. Midfoot (tarsometatarsal / Lisfranc joint)

Explanation

Correct Answer: CIn diabetic patients, Charcot arthropathy most commonly affects the midfoot, specifically the tarsometatarsal (Lisfranc) and transverse tarsal (Chopart) joints. This often leads to the classic "rocker-bottom" deformity due to collapse of the medial longitudinal arch. While the hindfoot and ankle can also be involved, the midfoot is the most frequent site (up to 60% of cases). The knee is more commonly affected in patients with neurosyphilis (tabes dorsalis), and the shoulder/elbow in patients with syringomyelia.

Question 740

Topic: Midfoot & Hindfoot

A 58-year-old diabetic male presents with a painless, swollen left foot. Radiographs demonstrate extensive periarticular debris, fragmentation of the navicular and cuboid, and subluxation of the midtarsal joint. According to the Eichenholtz classification, what is the most appropriate initial management for this stage of the disease?

. Immediate open reduction and internal fixation
. Total contact casting and non-weight bearing
. Custom orthotic shoe wear
. Midfoot arthrodesis with rigid fixation
. Below-knee amputation

Correct Answer & Explanation

. Total contact casting and non-weight bearing

Explanation

Correct Answer: Total contact casting and non-weight bearingThe patient is in Eichenholtz Stage I (Developmental/Fragmentation stage) of Charcot arthropathy, characterized by joint edema, erythema, periarticular debris, fragmentation, and subluxation. The gold standard for initial management of acute (Stage I) Charcot arthropathy is immobilization and offloading, typically achieved with a total contact cast (TCC). Surgery is generally contraindicated in the acute inflammatory phase due to poor bone quality, active hyperemia, and a high risk of hardware failure, unless there is an impending skin breakdown that cannot be managed conservatively.

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