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8. Foot and Ankle MCQs

Practice Set 309 of 353

This practice set contains high-yield board review questions covering key concepts in 8. Foot and Ankle. Each clinical scenario is designed to test your diagnostic and management skills relevant to this subspecialty.

Question 6161

Topic: 8. Foot and Ankle

What is the primary significance of noting generalized skin atrophy and fragility over the dorsum of the foot in a patient with rheumatoid arthritis undergoing examination?

. It suggests poor vascular supply to the forefoot.
. It is a normal age-related change and not clinically significant.
. It indicates active inflammation and synovitis.
. It highlights a potential complication for surgical wound healing.
. It is solely related to long-term systemic steroid use, not the disease itself.

Correct Answer & Explanation

. It highlights a potential complication for surgical wound healing.

Explanation

Generalized skin atrophy and fragility, particularly in older patients with RA, is often a consequence of long-term systemic corticosteroid therapy, which is commonly used to manage RA. This skin condition significantly increases the risk of wound healing complications, skin tears, and dehiscence following surgical procedures, making it a critical preoperative assessment. While poor vascular supply can be a factor, and steroids are implicated, thesignificancein examination is surgical risk.

Question 6162

Topic: Forefoot

In evaluating a severe hallux valgus deformity in a rheumatoid foot, what aspect of the deformity is MORE indicative of a poor prognosis for conservative management and higher likelihood for complex surgical intervention, compared to idiopathic hallux valgus?

. The degree of lateral deviation of the great toe
. The presence of a symptomatic bunion
. The extent of first MTP joint subluxation or dislocation and joint destruction
. The patient's age and activity level
. Associated lesser toe hammer deformities

Correct Answer & Explanation

. The extent of first MTP joint subluxation or dislocation and joint destruction

Explanation

In rheumatoid arthritis, the hallux valgus deformity is often characterized by significant MTP joint subluxation or complete dislocation, along with widespread joint destruction (erosions, cartilage loss). This severe joint pathology indicates advanced disease and mechanical instability, making conservative measures largely ineffective and often requiring complex reconstructive surgery (e.g., arthrodesis or arthroplasty) rather than simple bunionectomy. The other factors are important but less specific to therheumatoidnature and its surgical implications.

Question 6163

Topic: 8. Foot and Ankle

Which of the following observations during a patient's self-reported functional assessment would be MOST concerning for advanced rheumatoid foot disease requiring potential surgical consideration?

. Difficulty running a mile
. Inability to wear conventional footwear due to pain and deformity
. Occasional morning stiffness for 30 minutes
. Mild discomfort after prolonged standing
. Requiring custom orthotics for comfort

Correct Answer & Explanation

. Inability to wear conventional footwear due to pain and deformity

Explanation

The inability to wear conventional footwear due to severe pain and deformity is a cardinal sign of significant functional impairment in rheumatoid foot disease and often a primary indication for surgical intervention. It represents a substantial impact on daily life and quality of life. The other options describe lesser degrees of functional limitation that might be manageable conservatively or are characteristic of early/moderate disease.

Question 6164

Topic: 8. Foot and Ankle

During your examination, you note significant forefoot pronation and splaying. This clinical finding is often associated with which specific radiographic change in the rheumatoid forefoot?

. Osteophyte formation at the ankle joint
. Erosion of the talonavicular joint
. Widening of the intermetatarsal angles and MTP joint erosions
. Calcaneal spurring
. Os trigonum syndrome

Correct Answer & Explanation

. Widening of the intermetatarsal angles and MTP joint erosions

Explanation

Forefoot pronation and splaying (spreading of the metatarsals) are classic features of advanced rheumatoid forefoot disease. This is directly correlated with widening of the intermetatarsal angles and significant erosions and destruction of the MTP joints. The loss of joint integrity and support structures (plantar plate, collateral ligaments) allows the metatarsals to spread and the forefoot to pronate. Other options relate to different parts of the foot or pathologies.

Question 6165

Topic: 8. Foot and Ankle

When performing a neurovascular assessment of the rheumatoid foot, what is the MOST reliable indicator of adequate perfusion in the presence of severe deformity and swelling?

. Strong palpable dorsalis pedis pulse
. Capillary refill time of less than 2 seconds in the toes
. Warmth of the skin over the forefoot
. Intact sensation to light touch in the toes
. Absence of night cramps

Correct Answer & Explanation

. Capillary refill time of less than 2 seconds in the toes

Explanation

Capillary refill time of less than 2 seconds in the toes is the most reliable and objective clinical indicator of adequate perfusion, especially in the setting of severe deformity and swelling where pulses might be difficult to palpate. While strong pulses are ideal, they can be elusive. Warmth can be due to inflammation, and sensation assesses neurological function, not vascular status directly.

Question 6166

Topic: 8. Foot and Ankle

A 45-year-old male with early rheumatoid arthritis complains of mild pain and stiffness in the ankle and hindfoot. On physical exam, what would be the MOST subtle but significant early sign of subtalar joint involvement?

. Gross hindfoot valgus deformity
. Limited ankle dorsiflexion
. Tenderness and mild swelling over the sinus tarsi region with restricted inversion/eversion
. Pain with palpation of the Achilles tendon
. Positive 'too many toes' sign

Correct Answer & Explanation

. Tenderness and mild swelling over the sinus tarsi region with restricted inversion/eversion

Explanation

Early subtalar joint involvement in RA often manifests as tenderness and subtle swelling over the sinus tarsi (the depression anterior to the lateral malleolus) and, more importantly, restricted and painful range of motion for inversion and eversion. Gross hindfoot valgus and the 'too many toes' sign are typically later findings. Ankle dorsiflexion primarily involves the tibiotalar joint. Achilles tendon pain points to tendinopathy.

Question 6167

Topic: 8. Foot and Ankle

Which of the following differentiates the 'rheumatoid foot' from a common idiopathic adult acquired flatfoot on physical examination?

. Presence of a rigid pes planovalgus deformity.
. Medial arch collapse and hindfoot valgus.
. Tenderness along the posterior tibial tendon.
. Widespread inflammatory polyarthritis affecting multiple joints of the foot, often with prominent MTP joint involvement and forefoot splaying.
. Limited ankle dorsiflexion.

Correct Answer & Explanation

. Widespread inflammatory polyarthritis affecting multiple joints of the foot, often with prominent MTP joint involvement and forefoot splaying.

Explanation

While both conditions can present with a flatfoot deformity, the hallmark of the rheumatoid foot is the widespread inflammatory polyarthritis affecting multiple joints, often including characteristic forefoot deformities like MTP joint subluxation/dislocation, splaying, and severe hallux valgus, alongside midfoot and hindfoot involvement. Idiopathic adult acquired flatfoot is typically initiated by posterior tibial tendon dysfunction and primarily involves midfoot/hindfoot collapse. Widespread inflammatory changes are key to RA.

Question 6168

Topic: 8. Foot and Ankle

When assessing the forefoot for surgical planning in rheumatoid arthritis, the 'toe-to-ground' distance is a critical measurement. A large toe-to-ground distance, particularly for the lesser toes, indicates:

. Flexible claw toe deformity amenable to simple soft tissue release.
. Mild MTP joint synovitis.
. Fixed MTP joint dorsiflexion contracture and likely dislocation, requiring bony resection or fusion.
. An associated Morton's neuroma.
. Good prognosis for conservative treatment with orthotics.

Correct Answer & Explanation

. Fixed MTP joint dorsiflexion contracture and likely dislocation, requiring bony resection or fusion.

Explanation

A large toe-to-ground distance signifies a severe, fixed MTP joint dorsiflexion contracture, often with underlying MTP joint dislocation. The toes are held in a 'cock-up' position, preventing them from touching the ground. This degree of deformity is usually rigid and requires significant surgical intervention, such as metatarsal head resection, MTP joint fusion, or complex realignment, to bring the toes back into functional contact with the ground for proper weightbearing and footwear. Simple soft tissue release is insufficient for fixed dislocations.

Question 6169

Topic: Midfoot & Hindfoot

Which specific finding during the examination of the rheumatoid ankle and hindfoot suggests rupture or significant dysfunction of the posterior tibial tendon (PTT)?

. Pain with resisted eversion
. Inability to perform a single heel-rise and progressive pes planovalgus deformity
. Pain with palpation over the peroneus brevis tendon
. Positive Tinel's sign at the medial malleolus
. Restricted subtalar inversion but preserved eversion

Correct Answer & Explanation

. Inability to perform a single heel-rise and progressive pes planovalgus deformity

Explanation

Inability to perform a single heel-rise test and progressive pes planovalgus deformity are classic clinical signs of posterior tibial tendon dysfunction (PTTD), which can range from tendinopathy to complete rupture. The PTT is the primary dynamic stabilizer of the medial longitudinal arch, and its failure leads to progressive flatfoot. Pain with resisted eversion would suggest peroneal tendinopathy. Tinel's sign is for nerve compression. Restricted subtalar inversion/eversion assesses joint motion rather than tendon function directly.

Question 6170

Topic: 8. Foot and Ankle

A patient with severe rheumatoid forefoot disease presents with ulceration over a prominent metatarsal head. What is the MOST crucial initial step in managing this finding during the examination?

. Prescribe broad-spectrum oral antibiotics.
. Recommend immediate surgical resection of the metatarsal head.
. Assess for infection, offload the ulcer, and initiate local wound care.
. Perform a vascular assessment to rule out peripheral artery disease.
. Apply a rigid cast to immobilize the foot.

Correct Answer & Explanation

. Assess for infection, offload the ulcer, and initiate local wound care.

Explanation

The most crucial initial step is to assess for infection (clinical signs, cultures), offload the ulcer to reduce pressure on the affected area, and initiate meticulous local wound care. This aims to heal the ulcer and prevent worsening or deep infection. Surgical intervention is typically deferred until the ulcer is healed. While vascular assessment is important in any patient with foot ulcers, the immediate management focuses on the local wound. Antibiotics might be needed if infected, but initial assessment and offloading are paramount.

Question 6171

Topic: 8. Foot and Ankle

When assessing for a chronic rupture of the Achilles tendon in a patient with rheumatoid arthritis, what clinical sign might be masked or less obvious compared to an acute rupture?

. A palpable gap in the tendon
. Positive Thompson test
. Inability to bear weight
. Decreased ankle dorsiflexion
. Chronic swelling around the posterior ankle

Correct Answer & Explanation

. Positive Thompson test

Explanation

In a chronic Achilles tendon rupture, the muscle-tendon unit may have retracted, but over time, scar tissue can fill the gap, making a palpable defect less obvious than in an acute rupture. However, the Thompson test (squeezing the calf muscle) remains a reliable indicator of tendon integrity, showing absence of plantarflexion. Inability to bear weight is a functional consequence, and swelling is a general inflammatory sign, not specific to rupture.

Question 6172

Topic: 8. Foot and Ankle

A 50-year-old patient with rheumatoid arthritis reports new-onset pain in the plantar aspect of the heel, worse with the first steps in the morning. This symptom, in the context of RA, should first prompt consideration of:

. Stress fracture of the calcaneus
. Inflammatory plantar fasciitis (enthesitis)
. Tarsal Tunnel Syndrome
. Retrocalcaneal bursitis
. Degenerative arthritis of the subtalar joint

Correct Answer & Explanation

. Inflammatory plantar fasciitis (enthesitis)

Explanation

Plantar fasciitis, or more specifically, inflammatory enthesitis at the plantar fascia insertion, is a common manifestation of seronegative spondyloarthropathies, but can also occur in rheumatoid arthritis as a consequence of systemic inflammation or altered biomechanics. The classic symptom of morning pain and pain after rest ('post-static dyskinesia') is characteristic. While a stress fracture is a differential, inflammatory plantar fasciitis is a more common RA-related cause of this symptom pattern. Tarsal Tunnel causes nerve pain, and retrocalcaneal bursitis is posterior heel pain.

Question 6173

Topic: 8. Foot and Ankle

Which of the following represents the MOST accurate assessment of the functional impact of rheumatoid foot disease on a patient's activities of daily living (ADLs)?

. Measurement of MTP joint range of motion
. Radiographic assessment of joint erosion scores
. Observational gait analysis and patient-reported outcome measures (e.g., HAQ-DI, AOFAS)
. Palpation for synovitis in the forefoot
. Assessment of skin integrity

Correct Answer & Explanation

. Observational gait analysis and patient-reported outcome measures (e.g., HAQ-DI, AOFAS)

Explanation

While clinical examination and radiographic findings are crucial for diagnosis and surgical planning, patient-reported outcome measures (PROMs) like the Health Assessment Questionnaire Disability Index (HAQ-DI) or the American Orthopaedic Foot & Ankle Society (AOFAS) scores, combined with observational gait analysis, provide the most comprehensive and patient-centric assessment of the functional impact on ADLs and quality of life. These tools directly capture the patient's subjective experience and functional limitations.

Question 6174

Topic: 8. Foot and Ankle
When assessing for Achilles tendon tightness in a rheumatoid patient, how is true ankle dorsiflexion distinguished from compensation through midfoot collapse or subtalar joint motion?
. By performing the Thompson test.
. By assessing dorsiflexion with the knee flexed to 90 degrees.
. By stabilizing the subtalar joint and midfoot while performing the Silfverskiöld test.
. By observing the 'too many toes' sign.
. By palpating for a Haglund's deformity.

Correct Answer & Explanation

. By stabilizing the subtalar joint and midfoot while performing the Silfverskiöld test.

Explanation

The Silfverskiöld test is specifically designed to differentiate between gastrocnemius contracture and soleus/Achilles contracture, but more importantly, to ensure true ankle dorsiflexion is measured. By stabilizing the subtalar joint and midfoot, and keeping the knee extended and then flexed, one can ensure that ankle dorsiflexion is occurring solely at the tibiotalar joint, preventing compensatory motion from the midfoot or subtalar joint, which can falsely increase the perceived dorsiflexion.

Question 6175

Topic: 8. Foot and Ankle

A male patient with rheumatoid arthritis presents with chronic pain and swelling over the dorsal midfoot. On examination, you notice a palpable, firm mass. Which of the following is the MOST likely diagnosis?

. Morton's neuroma
. Plantar fibromatosis
. Dorsal ganglion cyst
. Rheumatoid nodule
. Haglund's deformity

Correct Answer & Explanation

. Rheumatoid nodule

Explanation

A palpable, firm mass over the dorsal midfoot in a rheumatoid patient is most likely a rheumatoid nodule. These subcutaneous nodules are common extra-articular manifestations of RA and can occur over bony prominences and tendons, including the foot. While dorsal ganglion cysts can occur, and other masses are possible, the context of RA makes rheumatoid nodule a high probability. Morton's neuroma is interdigital, plantar fibromatosis is plantar, and Haglund's deformity is posterior heel.

Question 6176

Topic: 8. Foot and Ankle

Which of the following is the MOST challenging aspect to accurately assess during a clinical examination of the rheumatoid foot due to widespread joint involvement and compensatory mechanisms?

. The degree of hallux valgus deformity
. The presence of callosities
. The specific contribution of individual joint pathologies (e.g., MTP vs. midfoot vs. ankle) to overall pain and dysfunction
. Skin temperature and color
. Toe-to-ground distance

Correct Answer & Explanation

. The specific contribution of individual joint pathologies (e.g., MTP vs. midfoot vs. ankle) to overall pain and dysfunction

Explanation

Due to the widespread and often synchronous involvement of multiple joints (forefoot, midfoot, hindfoot, ankle) in rheumatoid arthritis, along with complex compensatory mechanisms, it is often extremely challenging to precisely identify thespecificcontribution of each individual joint or deformity to the patient's overall pain and functional limitations. This requires careful differential diagnosis and sometimes diagnostic injections or imaging to isolate sources of pain. The other options are generally more straightforward to assess clinically.

Question 6177

Topic: 8. Foot and Ankle

When examining a patient with rheumatoid arthritis who reports symptoms of 'burning and tingling' in the toes after walking, you suspect a neurological component. What is the MOST appropriate next step in your focused physical examination?

. Assess for crepitus in the MTP joints.
. Evaluate ankle range of motion.
. Perform a neurovascular assessment, including sensation, motor strength, and Tinel's test at relevant entrapment sites.
. Check for a positive 'too many toes' sign.
. Palpate the Achilles tendon.

Correct Answer & Explanation

. Perform a neurovascular assessment, including sensation, motor strength, and Tinel's test at relevant entrapment sites.

Explanation

Burning and tingling are classic neuropathic symptoms. Therefore, a comprehensive neurovascular assessment is paramount. This includes testing sensation (light touch, pinprick, two-point discrimination), motor strength (intrinsic and extrinsic foot muscles), and specifically performing a Tinel's test at potential nerve entrapment sites (e.g., posterior tibial nerve in the tarsal tunnel, common peroneal nerve at the fibular head, interdigital nerves for Morton's neuroma). The other options are less directly related to neuropathic symptoms.

Question 6178

Topic: 8. Foot and Ankle

Which of the following physical examination findings is MOST indicative of the need for custom shoewear rather than modified off-the-shelf shoes for a patient with rheumatoid arthritis?

. Mild hallux valgus with a small bunion
. Flexible hammer toe of the second digit
. Significant forefoot splaying and severe MTP joint dislocations with prominent metatarsal heads
. Mild ankle stiffness with some loss of dorsiflexion
. Plantar fasciitis symptoms

Correct Answer & Explanation

. Significant forefoot splaying and severe MTP joint dislocations with prominent metatarsal heads

Explanation

Significant forefoot splaying and severe MTP joint dislocations with prominent metatarsal heads create a foot shape that is extremely difficult to accommodate in standard or even modified off-the-shelf footwear. These deformities cause severe pressure points, pain, and instability, necessitating custom-molded shoes to provide adequate volume, cushioning, and support, thus preventing skin breakdown and improving comfort and function. The other conditions can often be managed with wider shoes, orthotics, or minor modifications.

Question 6179

Topic: 8. Foot and Ankle

When examining the ankle of a rheumatoid patient, what clinical sign indicates significant ankle instability, often due to ligamentous laxity or joint destruction?

. Pain with passive range of motion
. Crepitus during movement
. Positive anterior drawer or talar tilt test with laxity beyond physiological limits
. Generalized swelling around the joint
. Limited dorsiflexion

Correct Answer & Explanation

. Positive anterior drawer or talar tilt test with laxity beyond physiological limits

Explanation

A positive anterior drawer test (assessing anterior talofibular ligament) or talar tilt test (assessing calcaneofibular ligament and deltoid ligament depending on inversion/eversion stress) with demonstrable laxity beyond what is considered physiological indicates significant ankle instability. In rheumatoid arthritis, chronic inflammation can lead to ligamentous attenuation and joint destruction, compromising stability. Pain, crepitus, swelling, and limited ROM are signs of arthritis or inflammation but not necessarily instability.

Question 6180

Topic: 8. Foot and Ankle

A patient with rheumatoid arthritis undergoing a preoperative foot examination has a history of severe peripheral neuropathy. Which of the following findings would be MOST concerning for potential surgical complications?

. Absence of light touch sensation in the toes
. Diminished ankle reflexes
. Presence of a Charcot joint in the midfoot
. Decreased vibratory sense in the forefoot
. Chronic venous insufficiency

Correct Answer & Explanation

. Presence of a Charcot joint in the midfoot

Explanation

The presence of a Charcot joint (neuropathic arthropathy) in the midfoot is an absolute contraindication to most elective foot surgeries in a patient with severe neuropathy. Charcot arthropathy indicates profound joint destruction, instability, and an inability of the patient to protect the limb due to loss of sensation and proprioception. Operating on a Charcot joint dramatically increases the risk of nonunion, infection, further collapse, and limb loss. While other neuropathic signs and venous insufficiency are concerning, Charcot joint is uniquely problematic for surgery.

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