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Pes Cavovarus (High-Arched Foot Deformity)

A complex three-dimensional foot deformity with elevated medial arch (cavus), forefoot pronation/plantarflexion, hindfoot varus, and forefoot adductus, frequently associated with neuromuscular disorders (Charcot-Marie-Tooth most common); requires neurologic workup and orthopedic correction.

Written by: Saygı Hospital Health Guide Editorial Board
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This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

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What is Pes Cavovarus (High-Arched Foot Deformity)?

Pes cavovarus is a complex three-dimensional pediatric and adult foot deformity characterized by an abnormally high medial longitudinal arch (pes cavus), with associated hindfoot varus (heel inversion), forefoot adductus, and plantarflexion of the first ray. The Coleman block test distinguishes flexible from rigid deformity by neutralizing the first ray on a block — flexible cavovarus corrects to neutral hindfoot, rigid does not.

Etiology is critical to identify and most cases are neuromuscular — Charcot-Marie-Tooth (CMT) hereditary motor and sensory neuropathy is the leading cause (78 percent of bilateral cavovarus, especially CMT1A, the most common form; PMP22 duplication on chromosome 17p11.2); other causes include cerebral palsy, hereditary spastic paraplegia, Friedreich ataxia, polio sequelae, spinal dysraphism (spina bifida, tethered cord), post-traumatic (compartment syndrome with intrinsic muscle contracture), Lyme disease, syringomyelia, and idiopathic (minority of unilateral, mild bilateral, and adult-onset cases).

Pathomechanics: the deformity is driven by muscle imbalance — typically a strong peroneus longus (plantar flexor of first ray) overpowering a weak tibialis anterior, combined with a strong tibialis posterior (inverter) overpowering weak peroneus brevis (everter). This pulls the first ray into plantarflexion, drives the forefoot into pronation, and the compensatory hindfoot inversion produces the typical varus alignment. Diagnosis: weight-bearing AP and lateral foot radiographs (Meary angle > 4 degrees abnormal — indicates cavus; calcaneal pitch > 30 degrees; Hibbs angle < 150 degrees), Coleman block test (flexible vs rigid), comprehensive neurologic exam (intrinsic foot muscle wasting, claw toes, hand atrophy, hammer toes, deep tendon reflex evaluation, sensation testing), nerve conduction studies and electromyography (NCS/EMG — CMT1 demonstrates uniform demyelination), genetic testing for CMT (PMP22 duplication for CMT1A, others), MRI lumbosacral spine if spinal dysraphism suspected.

Symptoms

Visible high arch, hindfoot inversion (heel turning inward)
Lateral foot pain, especially at fifth metatarsal base
Recurrent ankle sprains (limited subtalar eversion, lateral ankle instability)
Claw toes (intrinsic minus, hyperextended MTP, flexed IP joints)
Peroneus brevis tendinopathy or tears
Fifth metatarsal stress fractures (Jones fracture, base of fifth metatarsal)
Calluses on lateral border of foot, fifth metatarsal head, and first metatarsal head
Hand intrinsic muscle wasting, hand weakness (CMT)
Family history of foot deformity or neurologic disease (CMT)
Difficulty fitting shoes
Foot fatigue, cramping, weakness with walking

Risk Factors

Charcot-Marie-Tooth disease (most common — 78 percent of bilateral cavovarus, especially CMT1A — PMP22 duplication 17p11.2)
Hereditary spastic paraplegia, Friedreich ataxia, hereditary sensory autonomic neuropathy
Cerebral palsy
Spinal dysraphism (spina bifida, tethered cord, syringomyelia)
Polio sequelae
Post-traumatic (compartment syndrome, foot trauma with intrinsic muscle contracture)
Family history of foot deformity (autosomal dominant CMT, others)
Bilateral involvement strongly suggests neurologic cause
Adult onset may indicate progressive neurologic disease (Friedreich, syringomyelia)
Idiopathic cavovarus (less common — diagnosis of exclusion)

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Visible high arch with hindfoot varus deformity in child or adult
  • Recurrent ankle sprains in child
  • Lateral foot pain, fifth metatarsal pain
  • Claw toes with hand intrinsic muscle wasting (suspect CMT — neurologic referral)
  • Family history of CMT or foot deformity
  • Spinal cutaneous abnormalities with foot deformity (suspect spinal dysraphism)
  • Progressive foot deformity in adult (suspect neurologic disease)
  • Failed orthotics with persistent pain
  • Difficulty walking or running

Treatment Methods

01
Diagnostic workup: comprehensive neurologic exam, weight-bearing AP and lateral foot radiographs (Meary angle, calcaneal pitch, Hibbs angle), Coleman block test, nerve conduction studies and EMG, genetic testing for CMT (PMP22 duplication), MRI lumbosacral spine if spinal dysraphism suspected, neurology referral for definitive diagnosis of underlying neuromuscular disease
02
Conservative therapy first-line for mild and flexible deformity: rigid lateral wedge orthosis with first-ray cutout (Coleman insert) to derotate the foot, recessed heel, accommodative custom inserts; physical therapy for stretching tight Achilles, plantar fascia, peroneus longus and strengthening tibialis anterior, peroneus brevis; ankle stabilization exercises; activity modification
03
AFO (ankle-foot orthosis) for foot drop in CMT or other neurologic causes
04
Bracing for stable but symptomatic deformity not amenable to surgery
05
Surgical indications: failed conservative therapy with persistent disabling pain, recurrent ankle instability, progressive deformity, neuromuscular cause with progressive disease
06
Soft tissue procedures (combined with bony procedures): plantar fascia release (Steindler), peroneus longus to brevis transfer (decreases first ray plantarflexion force, augments evertor), tibialis posterior transfer to dorsum (Bridle procedure, addresses foot drop in CMT), Achilles tendon lengthening (Hoke triple-cut or open Z-lengthening), claw toe correction (Girdlestone-Taylor or Jones procedure)
07
Bony procedures (rigid deformity, mature skeleton): first metatarsal dorsiflexion osteotomy (corrects forefoot equinus driving cavus), Dwyer lateral closing-wedge calcaneal osteotomy or lateralizing calcaneal osteotomy (corrects hindfoot varus), midfoot dorsiflexion osteotomy (Cole, Japas, Akron) for severe rigid cavus, triple arthrodesis (last resort for adult rigid deformity with arthritis)
08
CMT-specific considerations: progressive disease may require staged procedures; bilateral often required; post-op AFO bracing essential; long-term peroneal weakness despite tendon transfers; family genetic counseling
09
Postoperative: non-weight-bearing in cast or boot for 6–8 weeks, gradual return to weight bearing, physical therapy 6–12 months, custom orthotics post-op, gradual return to activities by 6–12 months
10
Multidisciplinary team: orthopedic foot and ankle surgery, neurology (CMT and other neuromuscular disease management), physical therapy, orthotist, genetic counseling, pediatric orthopedics for pediatric cases
11
Long-term follow-up: deformity progression with growth, recurrent symptoms, adjacent joint degeneration, bracing adjustment, monitor for progression of underlying neuromuscular disease

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.