MCQs – Peds Foot 2

Modern Study Review (AI-Generated)

High-Yield Summary

Clubfoot deformity and its management are a staple of the Royal College exam, focusing heavily on pathoanatomy, timing of intervention, and surgical decision-making. The critical clinical trade-off is the timing and sequence of correction—early serial casting starting at birth versus surgical intervention typically between 4-12 months. The examiner often forces a choice between conservative casting and surgical correction based on deformity rigidity and age. While classic teaching emphasizes extensive soft tissue release surgery, modern practice increasingly favors minimally invasive tendon transfers and Ponseti casting protocols to minimize morbidity.

High-Yield Decision Matrix

Active Recall Q&A

Clubfoot Deformity and Treatment

Q: What is the best treatment for a residual dynamic clubfoot deformity seen in the swing phase?
A: Tendon transfer such as SPLAT (split anterior tibialis transfer) or tibialis posterior transfer through the interosseous membrane.
Related Pearl: Dynamic deformities reflect muscle imbalance; tendon transfers restore balanced foot mechanics during gait, improving swing phase clearance.

Q: What are the key pathoanatomic rotations in clubfoot deformity?
A: Medial rotation of the talar neck, lateral rotation of the talar body, and medial rotation of the calcaneus.
Related Pearl: The 3D multiplanar deformity requires correction in all planes; isolated correction risks residual deformity.

Q: When should treatment of clubfoot begin?
A: On the day of birth with serial casting.
Related Pearl: Early casting exploits neonatal ligamentous laxity and cartilage plasticity, optimizing deformity correction and reducing need for surgery.

Q: What is the sequence of correction during serial casting of clubfoot?
A: Correct forefoot supination and adduction first, then correct equinus; avoid simultaneous correction to prevent midfoot break.
Related Pearl: Premature equinus correction risks midfoot collapse and residual deformity, a common exam trap.

Q: What is the ideal age range for clubfoot surgery?
A: Controversial, but generally between 4-12 months.
Related Pearl: Surgery too early risks stiffness; too late risks fixed deformity and poor outcomes; timing must balance these risks.

Neonatal Rigid Clubfoot and Associations

Q: What should be suspected in a neonate with rigid clubfeet and inability to fully extend hips or knees?
A: Arthrogryposis.
Related Pearl: Arthrogryposis causes joint contractures; congenital dislocations usually present with hyperextension, not limited extension.

Q: What is the typical knee position in congenital knee dislocation?
A: Hyperextension, not limitation of extension.
Related Pearl: Differentiates congenital dislocation from arthrogryposis in neonates; important for diagnosis and management.

Q: What syndromes are associated with clubfoot?
A: PFFD, Pierre Robin, Larsen’s syndrome, amniotic bands, myelodysplasia, arthrogryposis, diastrophic dysplasia.
Related Pearl: Recognizing syndromic associations guides comprehensive management and genetic counseling.

Q: Which syndromes are not associated with clubfoot?
A: Alpert’s syndrome, Albright’s syndrome, Alper’s disease, Apert’s syndrome.
Related Pearl: Avoid diagnostic confusion by knowing non-associated syndromes; critical for differential diagnosis.

Tarsal Coalition and Foot Deformities

Q: What is the recommended treatment for a 16-year-old with painful tarsal coalition and talonavicular arthritis?
A: Triple arthrodesis including talonavicular, subtalar, and calcaneocuboid joints.
Related Pearl: Arthritis contraindicates bar excision; fusion provides pain relief and restores foot stability.

Q: What determines the success of treatment for calcaneonavicular coalition?
A: Adequate resection and interposition of fat or extensor digitorum brevis origin; peroneus tertius is not suitable for interposition.
Related Pearl: Proper interposition prevents reossification and recurrence, a common cause of treatment failure.

Q: In congenital metatarsus varus, where is the navicular dislocated?
A: Lateral to the talus.
Related Pearl: This lateral displacement differentiates metatarsus varus from clubfoot, which has medial displacement.

Q: What is the natural history of congenital calcaneal valgus foot deformity?
A: Most resolve spontaneously or with gentle stretching; serial casting if persistent.
Related Pearl: It is a packaging deformity, not a fixed structural problem, so aggressive intervention is rarely needed.

Neurologic and Prognostic Indicators

Q: What diagnosis is suggested by bilateral pes cavus, hairy patch on the back, and foot ulcer?
A: Diastematomyelia or myelomeningocele with tethered cord.
Related Pearl: Unilateral foot deformities and limb asymmetry are common in diastematomyelia; early diagnosis prevents neurologic deterioration.

Q: What Kite’s angle range predicts a good result from clubfoot casting?
A: 20-40 degrees.
Related Pearl: Kite’s angle reflects talocalcaneal divergence; parallel talus and calcaneus indicate poor correction potential.

Q: What are poor prognostic signs in clubfoot casting?
A: Deep medial crease, parallel talus and calcaneus, short first ray.
Related Pearl: These signs indicate rigid deformity and soft tissue contracture, often requiring surgical intervention.

Q: What is the position of the calcaneus in clubfoot?
A: In varus, not valgus.
Related Pearl: Varus calcaneus contributes to the cavovarus foot shape characteristic of clubfoot.

Q: What is the heel position in metatarsus adductus?
A: Valgus, not varus.
Related Pearl: Heel valgus helps differentiate metatarsus adductus from clubfoot, which has heel varus.

Q: What condition is metatarsus adductus associated with?
A: Torticollis.
Related Pearl: Both may result from intrauterine positioning, important for holistic patient assessment.

Q: What is the typical ankle range of motion in metatarsus adductus?
A: Usually normal.
Related Pearl: Normal ankle ROM helps distinguish metatarsus adductus from other foot deformities with joint stiffness.

Classic Clinical Notes

• A residual clubfoot deformity that appears to be dynamic (seen in swing phase) is best treated with some sort of tendon transfer like a SPLAT (split anterior tibialis transfer) or a tib post transfer through the interosseous membrane.

• The pathoanatomy behind clubfoot deformity includes medial and plantar rotation of the talar neck, relative lateral rotation of the body (the ankle mortise I think is EXTERNALLY rotated), and medial rotation of the calcaneus. There is some controversy about whether there is internal or external rotation of the talus and whether there is internal rotation of the tibia.

• Treatment of clubfoot should begin the day of birth with serial casting.

• In terms of some of the abnormalities in clubfoot – the calf circumference is small (and likely will remain so); there is shortening and medial deviation of the neck of the talus; the answers suggest that there is increased thickness of the nerve fibers and dysplasia of the tendons in the foot – but I’m not sure about this – there is no mention in Lovell and Winter about abnormalities of the nerve fibers or of dysplasia of the tendons.

• During serial casting of the clubfoot, the supination and adduction of the forefoot is corrected first; after that, then try to correct the equinus. Don’t try to do both at once – you may get a midfoot break.

• The ideal time for clubfoot surgery is controversial, but probably sometime between 4-12 months.

• Beware the neonate with rigid clubfeet and inability to fully extend the hips or knees – probably an arthrogrypotic. Consider congenital dislocations of the knees and hips, but usually the knees are hyperextended in congenital dislocation – ie. extension is not a problem in congenital knee dislocation; nor is a problem in the dislocated hip either (they have incomplete abduction.)

• Clubfoot is associated with a number of disorders: PFFD, Pierre Robin, Larsen’s syndrome, amniotic bands, myelodysplasia, arthrogryposis, diastrophic dysplasia); it is not, as far as people have looked, associated with Alpert’s syndrome, Albright’s syndrome, or Alper’s disease, or Apert’s syndrome.

• Options for the 16 year old with pain and a tarsal coalition associated with talonavicular arthritis – tough question, but probably this child should have a triple arthrodesis. If you are gonna do the TN joint, then probably should do the subtalar and calcaneocuboid. Her arthritis makes her not a candidate for excision of bar.

• The results of treatment of calcaneal navicular coalition are dependent on the adequacy of resection and interposition of something – usually fat or extensor digitorum brevis origin. Peroneus tertius is way lateral and not available for interposition.

• In congenital metatarsus varus, the navicular is dislocated LATERAL to the talus.

• In congenital calcaneal valgus foot deformity, this is a common finding and is a packaging problem. Most resolve spontaneously or with the help of the parents doing gentle stretching exercises; if not, serial casting can be applied.

• A patient with bilateral pes cavus with a hairy patch on her back, and an ulcer on her one foot likely has a diastematomyelia or some form of myelomeningocele (which almost always has a tethered cord). Clinical findings of diastematomyelia include hair patches, anisomelia (calf or thigh circumference asymmetry) and foot deformities (usually cavus). Interestingly, they have often UNILATERAL foot deformities or calf/thigh asymmetry.

• In terms of predicting a good result from casting a clubfoot – look for divergence of the calcaneus and talus on Kite’s angle (a Kite’s angle of 20-40 is good). Bad findings include a deep medial crease, parallelism of the calcaneus and talus, and a short first ray.

• Pathoanatomy of clubfoot: lateral rotation of the talar body, medial rotation of the talar neck, medial rotation of the calcaneus which is in VARUS, not valgus.

• Metatarsus adductus is associated with torticollis. The heel is in valgus, not varus. Usually ankle ROM is normal.

Last Updated on January 25, 2026 by Christian Veillette