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 581
Topic: Midfoot & Hindfoot
A 50-year-old diabetic patient presents with a swollen, warm, and red foot without open ulcers. To differentiate an acute Eichenholtz Stage I Charcot arthropathy from acute osteomyelitis, which imaging modality is most specific?
Correct Answer & Explanation
. Indium-111 labeled white blood cell (WBC) scan
Explanation
An Indium-111 labeled WBC scan (especially when combined with a Tc-99m bone marrow scan) is highly specific for differentiating osteomyelitis from acute Charcot arthropathy. Charcot arthropathy alone will typically not show focal accumulation of labeled WBCs.
Question 582
Topic: Midfoot & Hindfoot
A 55-year-old diabetic patient presents with a warm, swollen, erythematous foot without ulceration. Radiographs show extensive fragmentation, periarticular debris, and subluxation of the midfoot joints. According to the Eichenholtz classification, what stage of Charcot arthropathy does this represent?
Correct Answer & Explanation
. Stage 1 (Development/Fragmentation)
Explanation
Eichenholtz Stage 1 (Development/Fragmentation) is characterized clinically by a warm, red, swollen foot and radiographically by joint subluxation/dislocation, bone fragmentation, and debris. Stage 2 (Coalescence) shows absorption of fine debris and early fusion. Stage 3 (Reconstruction) shows rounding of bone ends and solid arthrodesis.
Question 583
Topic: Midfoot & Hindfoot
A 55-year-old diabetic male with severe peripheral neuropathy presents with a rapidly developing, painless swelling and erythema of his left midfoot. Radiographs show disorganization, fragmentation, and subluxation of the tarsometatarsal joints, with significant bone destruction but no overt signs of infection. ESR and CRP are mildly elevated. What is the most crucial initial management strategy?
Correct Answer & Explanation
. Non-weight-bearing in a total contact cast (TCC) or removable walker boot.
Explanation
The patient's presentation (diabetic neuropathy, painless swelling, erythema, rapid onset, radiographic changes of disorganization/fragmentation without infection) is classic for acute Charcot arthropathy (Eichenholtz Stage 1). The paramount initial management is strict non-weight-bearing and immobilization in a total contact cast (TCC) or a custom removable walker boot (CROW boot) to protect the collapsing foot and prevent further destruction. Urgent surgical fusion (A) is typically reserved for stable, chronic deformities or acute unstable fractures that cannot be controlled non-operatively. Aggressive antibiotics (C) are not indicated unless infection is proven. While ruling out osteomyelitis (D) can be important, it's usually secondary to clinical suspicion and imaging, and the primary management for acute Charcot remains immobilization. Physical therapy (E) is contraindicated in the acute phase due to the risk of exacerbating joint destruction.
Question 584
Topic: Midfoot & Hindfoot
A 58-year-old female presents with recurrent right foot and ankle pain, progressively worsening over 5 years. She has a history of type 2 diabetes with peripheral neuropathy. Clinical examination reveals a fixed, rigid planovalgus deformity with a 'rocker-bottom' foot, severe midfoot collapse, and significant hindfoot abduction. Radiographs show extensive disorganization of the midfoot joints, fragmentation, and new bone formation. This presentation is most consistent with what stage of Charcot arthropathy and what is the primary surgical goal?
Correct Answer & Explanation
. Eichenholtz Stage 3 (Reconstruction/Consolidation); correction of deformity and stabilization.
Explanation
The clinical and radiographic findings of a fixed, rigid rocker-bottom foot with severe midfoot collapse and extensive joint disorganization, fragmentation, and new bone formation are characteristic of Eichenholtz Stage 3 (Reconstruction/Consolidation) Charcot arthropathy. At this stage, the primary surgical goal is to correct the severe deformity and achieve stable bony union, which often requires complex reconstructive procedures such as osteotomy, arthrodesis, and robust internal fixation. Stage 0 is preclinical. Stage 1 is acute, characterized by inflammation and joint effusion, requiring immobilization. Stage 2 is coalescence, where fragments begin to heal, still primarily requiring offloading. Stage 4 is not a standard Eichenholtz stage but refers to reactivation of disease, requiring re-evaluation. While offloading is always important for Charcot, the fixed deformity and chronic nature points to Stage 3 and the need for stabilization.
Question 585
Topic: Midfoot & Hindfoot
A 68-year-old female presents with severe, progressive adult acquired flatfoot deformity (AAFD) of her left foot. Clinical examination reveals a rigid hindfoot valgus, abduction of the forefoot, and inability to perform a single-limb heel rise. Radiographs confirm severe talonavicular collapse and midfoot break. This presentation corresponds to what stage of Johnson & Strom classification, and what is the generally accepted surgical management?
Correct Answer & Explanation
. Stage III; Triple arthrodesis.
Explanation
The description of rigid hindfoot valgus, forefoot abduction, inability to perform a single-limb heel rise (indicating posterior tibial tendon dysfunction), and talonavicular collapse with midfoot break in an elderly patient is consistent with Stage III AAFD (flexible deformity with fixed hindfoot valgus, severe forefoot abduction, and rigid changes in the talonavicular joint). For Stage III AAFD, the deformity is rigid, and reconstructive procedures like tendon transfers and osteotomies alone are often insufficient. Triple arthrodesis (fusion of the talonavicular, subtalar, and calcaneocuboid joints) is the generally accepted surgical management to correct the deformity and provide stable fusion, allowing the patient to bear weight on a corrected, stable foot. Stage I and II are flexible, managed with more conservative or joint-preserving surgeries. Stage IV involves ankle involvement. Lateral column lengthening is usually part of a Stage II reconstruction.
Question 586
Topic: Midfoot & Hindfoot
In a patient presenting with a Charcot 'rocker-bottom' foot deformity undergoing planning for circular frame correction, the sagittal plane CORA is most frequently located at:
Correct Answer & Explanation
. The tarsometatarsal (Lisfranc) joints
Explanation
In the classic Charcot rocker-bottom foot, the midfoot collapse and primary apex of the sagittal plane deformity (CORA) typically occur at the tarsometatarsal (Lisfranc) joint complex.
Question 587
Topic: Midfoot & Hindfoot
A 60-year-old female with diabetes and absent protective sensation presents with a red, hot, swollen midfoot. Radiographs demonstrate periarticular debris and subluxation at the Lisfranc joint. Erythema resolves upon elevation of the limb. What is the most appropriate initial management?
Correct Answer & Explanation
. Total contact casting and protected weight-bearing
Explanation
Correct Answer: Total contact casting and protected weight-bearingThe patient is presenting with acute Eichenholtz Stage I Charcot arthropathy. The mainstay of initial treatment for acute Charcot foot is strict immobilization and offloading to prevent further deformity and allow the inflammatory process to subside. This is most effectively achieved with a total contact cast (TCC) or a Charcot restraint orthotic walker (CROW), along with protected weight-bearing. Surgery is generally contraindicated in the acute, inflammatory stage due to poor bone quality and high risk of hardware failure, unless there is an impending skin breakdown or severe instability that cannot be managed conservatively.
Question 588
Topic: Midfoot & Hindfoot
A patient with diabetic neuropathy and a history of a swollen foot presents for follow-up. Radiographs of the foot now demonstrate absorption of fine bone debris, fusion of larger fragments, and early sclerosis of the midfoot joints. According to the Eichenholtz classification of neuropathic arthropathy, which stage does this represent?
Correct Answer & Explanation
. Stage II
Explanation
The Eichenholtz classification describes the natural history of Charcot arthropathy. Stage 0 is the prodromal stage (erythema, edema, normal radiographs). Stage I is the development/fragmentation stage (joint laxity, subluxation, osteochondral fragmentation, debris). Stage II is the coalescence stage, characterized by the absorption of fine debris, fusion of larger fragments, and early sclerosis. Stage III is the reconstruction/consolidation stage, characterized by rounding and smoothing of bone fragments, decreased sclerosis, and stable joint arthrosis.
Question 589
Topic: Midfoot & Hindfoot
A 58-year-old female with diabetes mellitus is found to have a loss of protective sensation on her bilateral feet. Which of the following best describes the primary clinical significance of this finding?
Correct Answer & Explanation
. It identifies the patient as being at high risk for neuropathic ulcerations.
Explanation
Correct Answer: CThe primary clinical significance of losing protective sensation (as tested by the 5.07 Semmes-Weinstein monofilament) is that it identifies the patient as being at a high risk for developing neuropathic ulcerations and Charcot arthropathy. It does not confirm peripheral arterial disease, nor does it mandate immediate surgery or amputation.
Question 590
Topic: Midfoot & Hindfoot
A 55-year-old obese female with a history of hypertension and osteoarthritis presents with progressive, severe planovalgus foot deformity. Examination reveals a painful, collapsed medial arch, hindfoot valgus, forefoot abduction, and the 'too many toes' sign. She has intact posterior tibial tendon strength (5/5). Which stage of adult acquired flatfoot deformity (AAFD) according to Johnson & Strom classification does this represent, and what is the typical surgical approach?
Correct Answer & Explanation
. Stage II; flexor digitorum longus (FDL) transfer and calcaneal osteotomy.
Explanation
The Johnson & Strom classification for Adult Acquired Flatfoot Deformity (AAFD) due to Posterior Tibial Tendon Dysfunction (PTTD) is: Stage I: Tenosynovitis, normal alignment. Stage II: Flexible flatfoot deformity, PTT elongated/attenuated. Stage III: Fixed flatfoot deformity. Stage IV: Involvement of the ankle joint. The patient's clinical picture (collapsed arch, hindfoot valgus, forefoot abduction, 'too many toes' sign) is consistent with a Stage II flexible deformity. Despite the 'intact' strength on manual testing, the tendon is functionally insufficient to maintain the arch, leading to the deformity. The standard surgical treatment for Stage II AAFD is FDL transfer and calcaneal osteotomy (Option 1).
Question 591
Topic: Midfoot & Hindfoot
A 35-year-old female presents with bilateral, painful pes planus. She has a history of rheumatoid arthritis (RA) and reports increasing difficulty with ambulation due to pain and stiffness in her feet. Examination reveals a rigid hindfoot valgus and forefoot abduction, with collapse of the longitudinal arch that is not correctable manually. Radiographs confirm severe hindfoot arthritis and talonavicular joint collapse. Which stage of adult acquired flatfoot deformity (AAFD) does this represent, and what is the most appropriate surgical intervention?
Correct Answer & Explanation
. Stage III RA-associated AAFD; triple arthrodesis.
Explanation
This patient's presentation (bilateral painful pes planus, rigid hindfoot valgus, forefoot abduction, uncorrectable arch collapse, severe hindfoot arthritis, and talonavicular joint collapse) in the context of rheumatoid arthritis indicates an advanced, fixed flatfoot deformity. This aligns with Stage III of the RA-associated AAFD classification. Option A (Stage II RA-associated AAFD; FDL transfer and calcaneal osteotomy) describes treatment for a flexible deformity, typically Stage II. The patient's deformity is described as 'rigid' and 'not correctable manually', ruling out Stage II. Option B (Stage III RA-associated AAFD; triple arthrodesis) is the most appropriate diagnosis and surgical intervention. Stage III in RA-associated flatfoot typically involves fixed deformity and significant hindfoot arthritis, often with talonavicular collapse. A triple arthrodesis (fusion of the talonavicular, subtalar, and calcaneocuboid joints) is the gold standard for correcting and stabilizing a rigid, arthritic flatfoot, providing pain relief and improved function by creating a stable platform for ambulation. Option C (Stage I RA-associated AAFD; orthotics and anti-inflammatory medication) is for early stages with synovitis and mild or no deformity. Option D (Stage IV RA-associated AAFD; pantalar fusion) involves ankle joint involvement (valgus tibiotalar tilt), necessitating fusion of the ankle in addition to the hindfoot. Option E (Subtalar arthroereisis) is a less invasive procedure used to limit subtalar joint eversion, mainly in pediatric flexible flatfoot, and is inappropriate for a rigid, arthritic adult flatfoot.
Question 592
Topic: Midfoot & Hindfoot
A 50-year-old obese female presents with a progressive, painful flatfoot deformity of her right foot. Clinical examination reveals a prominent navicular, 'too many toes' sign, hindfoot valgus, and forefoot abduction. She is unable to perform a single-limb heel rise, but the deformity is passively correctable. MRI shows tendinopathy and attenuation of the posterior tibial tendon (PTT). This presentation is consistent with Adult Acquired Flatfoot Deformity (AAFD) Stage IIB. What is the most appropriate surgical management?
This patient has Adult Acquired Flatfoot Deformity (AAFD) Stage IIB, characterized by a flexible deformity, inability to perform a single-limb heel rise, and PTT dysfunction with significant forefoot abduction. Surgical management for Stage II AAFD aims to correct the deformity, offload the PTT, and provide stability. A combination of procedures is typically required. Medializing calcaneal osteotomy (MCO) corrects hindfoot valgus. Flexor digitorum longus (FDL) tendon transfer to the navicular augments or replaces the failing PTT. Lateral column lengthening (LCL), usually via a calcaneal osteotomy (e.g., Evans osteotomy), corrects forefoot abduction. Therefore, medializing calcaneal osteotomy, FDL tendon transfer, and lateral column lengthening (Option B) represent the comprehensive surgical approach for Stage IIB AAFD. Isolated FDL transfer (Option A) would not adequately correct the bony deformity. Triple arthrodesis (Option C) is reserved for rigid (Stage III or IV) deformities. Subtalar fusion (Option D) is often part of a triple arthrodesis but not comprehensive enough for Stage IIB. Isolated lateral column lengthening (Option E) does not address the hindfoot valgus or PTT insufficiency.
Question 593
Topic: Midfoot & Hindfoot
A 22-year-old female presents with a 6-month history of right foot pain and a progressive flatfoot deformity. She has failed conservative management including orthotics and physical therapy. Physical exam reveals a rigid valgus hindfoot, abduction of the forefoot, and tenderness over the sinus tarsi. Radiographs show talonavicular coalition. What is the most appropriate surgical management?
The patient's rigid flatfoot deformity and talonavicular coalition, with failure of conservative treatment, point towards surgical intervention. For symptomatic rigid flatfoot due to talonavicular coalition, the most appropriate initial surgical management in a young adult is often a triple arthrodesis (Option B). This procedure corrects the multi-planar deformity and provides stability for a rigid flatfoot. Isolated excision of the coalition (Option A) is typically reserved for asymptomatic or minimally symptomatic coalitions, or for calcaneonavicular coalitions, and is less effective for a rigid talonavicular coalition. Subtalar arthroereisis (Option C) is generally for flexible flatfoot in younger patients. Isolated subtalar fusion (Option D) would not address the talonavicular pathology or the overall rigidity. Medializing calcaneal osteotomy with FDL transfer (Option E) is used for flexible flatfoot caused by posterior tibial tendon dysfunction, not for rigid flatfoot from a coalition.
Question 594
Topic: Midfoot & Hindfoot
Review the following clinical indication for midfoot trauma:
A 28-year-old athlete sustains a purely ligamentous Lisfranc injury. Plantar ecchymosis is present. According to prospective randomized trials comparing open reduction internal fixation (ORIF) to primary arthrodesis for purely ligamentous Lisfranc injuries, which of the following represents the primary advantage of primary arthrodesis?
Correct Answer & Explanation
. Lower rate of symptomatic hardware requiring removal and lower risk of subsequent secondary fusion
Explanation
Prospective randomized trials (e.g., Ly and Coetzee, Henning et al.) have demonstrated that for purely ligamentous Lisfranc injuries (involving the 1st, 2nd, and 3rd TMT joints), primary arthrodesis results in better functional outcomes and avoids the high rate of secondary procedures (e.g., hardware removal, late salvage arthrodesis for post-traumatic arthritis) associated with ORIF. Note: the lateral column (4th and 5th TMT) is highly mobile and should NOT be primarily fused.
Question 595
Topic: Midfoot & Hindfoot
A 55-year-old male with poorly controlled diabetes mellitus presents with a massively swollen, warm, and erythematous right foot. He denies pain and lacks protective sensation. Radiographs reveal midfoot bony fragmentation, joint subluxation, and extensive debris. There are no skin ulcerations. What is the most appropriate initial management?
Correct Answer & Explanation
. Total contact casting
Explanation
The patient is in the acute (Eichenholtz stage I) phase of Charcot neuroarthropathy. The gold standard for initial management of acute, non-ulcerated Charcot arthropathy is offloading and immobilization using a total contact cast (TCC).
Question 596
Topic: Midfoot & Hindfoot
A 55-year-old male with long-standing, poorly controlled type 2 diabetes presents with a swollen, erythematous, and painless right foot. The erythema resolves significantly when the leg is elevated. Radiographs reveal soft tissue swelling, periarticular osteopenia, and early fragmentation at the tarsometatarsal joint. What is the most appropriate initial management?
Correct Answer & Explanation
. Total contact casting (TCC) and non-weight-bearing
Explanation
The clinical picture describes acute Charcot arthropathy (Eichenholtz stage 0 or 1). The gold standard for initial management is immobilization and offloading, typically achieved with a Total Contact Cast (TCC) to prevent further joint destruction.
Question 597
Topic: Midfoot & Hindfoot
A 60-year-old diabetic patient presents with a red, hot, swollen foot. Radiographs demonstrate acute bony fragmentation, joint subluxation, and periarticular debris. Inflammatory markers are mildly elevated, but there is no ulceration. This presentation corresponds to Eichenholtz Stage 1. What is the most appropriate initial management?
Correct Answer & Explanation
. Total contact casting and strict non-weight bearing
Explanation
The patient has Eichenholtz Stage 1 (Developmental/Fragmentation) Charcot arthropathy. The standard of care is immediate immobilization and offloading, typically using a total contact cast, until the active inflammatory phase subsides.
Question 598
Topic: Midfoot & Hindfoot
A 30-year-old construction worker drops a heavy beam on his midfoot. Radiographs and CT imaging
demonstrate a purely ligamentous Lisfranc injury with significant lateral and dorsal displacement of the 2nd through 5th metatarsals. Based on recent literature comparing operative techniques, what is the favored surgical management for purely ligamentous Lisfranc injuries?
Correct Answer & Explanation
. Primary arthrodesis of the medial column tarsometatarsal joints
Explanation
Recent level 1 orthopedic trauma literature (such as the study by Coetzee et al. and subsequent meta-analyses) has shown that primary arthrodesis for purely ligamentous Lisfranc injuries provides superior short- and mid-term functional outcomes and lower rates of hardware removal and secondary surgery compared to Open Reduction and Internal Fixation (ORIF).
Question 599
Topic: Midfoot & Hindfoot
A 55-year-old diabetic patient presents with a warm, swollen, erythematous left foot. Radiographs show fragmentation, joint subluxation, and debris at the tarsometatarsal joints. According to the Eichenholtz classification, what stage of Charcot arthropathy is this?
Correct Answer & Explanation
. Stage II
Explanation
Eichenholtz Stage I is the developmental (fragmentation) stage, characterized by clinical inflammation and radiographic evidence of osteopenia, periarticular fragmentation, subluxation, and debris.
Question 600
Topic: Midfoot & Hindfoot
Which of the following is the most common cause of painful pes planus (flatfoot) in an adult?
Correct Answer & Explanation
. Posterior tibial tendon dysfunction (PTTD)
Explanation
Posterior tibial tendon dysfunction (PTTD), often progressing to adult acquired flatfoot deformity, is the most common cause of painful pes planus in adults. It results from a progressive attenuation and eventual failure of the posterior tibial tendon, leading to collapse of the medial longitudinal arch. While congenital pes planus, ligamentous laxity, tarsal coalition, and accessory navicular can cause flatfoot, PTTD is the predominant cause of adult-onset painful progressive flatfoot.
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