Cavus foot — a foot with an abnormally high arch — is less commonly discussed than flatfoot but can be equally symptomatic and functionally limiting. Unlike the mobile flatfoot that’s common in the general population, a high-arched foot is rigid and unable to absorb shock effectively, placing excessive pressure on the heel and ball of the foot, destabilizing the ankle, and predisposing patients to a characteristic cluster of painful conditions. Critically, cavus foot is frequently neurological in origin, making accurate diagnosis essential before treatment is planned.

What Defines Cavus Foot?

Cavus foot is defined by an elevated longitudinal arch on weight-bearing. Structurally, it involves plantarflexion of the first ray (the first metatarsal drops toward the ground), equinus of the hindfoot, claw toe deformities, and frequently a varus (inward-tilted) heel. The foot is rigid — it does not flatten when weight is applied — and absorbs shock poorly.

Causes of Cavus Foot

Neurological Causes (Most Important to Identify)

A significant proportion of cavus foot cases have an underlying neurological cause, particularly when the deformity is bilateral and progressive. The most common neurological associations include:

• Charcot-Marie-Tooth disease (CMT) — the most common hereditary peripheral neuropathy; produces progressive cavus deformity, peroneal muscle weakness, and intrinsic muscle atrophy over decades
• Friedreich’s ataxia — a spinocerebellar degenerative disease producing cavus foot, balance impairment, and cardiac involvement
• Spinal cord abnormalities — spina bifida, tethered cord, syringomyelia, and diastematomyelia can all produce unilateral cavus deformity
• Cerebral palsy and stroke — spastic equinovarus foot deformity has components of cavus alignment
• Polio sequelae — historic but still seen in older patients

A unilateral progressive cavus foot warrants MRI of the spine and neurological evaluation to rule out intraspinal pathology.

Idiopathic and Residual Causes

Many mild cavus feet are familial without an identifiable neurological disorder, and some result from residual clubfoot deformity inadequately corrected in childhood.

Symptoms and Associated Conditions

High-arched feet produce a characteristic cluster of problems resulting from abnormal pressure distribution and lateral ankle instability:

• Lateral ankle instability — chronic ankle sprains and giving-way from the varus hindfoot, which predisposes to inversion injury
• Metatarsalgia and stress fractures — the rigid forefoot transmits high pressure to the 1st and 5th metatarsal heads, producing calluses, metatarsalgia, and metatarsal stress fractures
• Plantar fasciitis — a high-tensioned plantar fascia under a rigid cavus arch is prone to heel insertion stress
• Claw toes — intrinsic muscle weakness produces hyperextension at the MTP joints and flexion at the IP joints
• Peroneal tendon problems — the varus hindfoot places the peroneals under chronic eccentric stress
• Heel pain — concentrated heel loading in a varus heel produces lateral heel calluses and fat pad irritation

Diagnosis

Dr. Biernacki at Balance Foot & Ankle performs a comprehensive evaluation including weight-bearing X-rays (to measure Meary’s angle, Hibb’s angle, and calcaneal pitch), Coleman block test (to assess whether hindfoot varus is flexible or rigid), and clinical neurological assessment. When CMT or another neurological etiology is suspected, EMG/NCS and genetic testing are coordinated.

Treatment of Cavus Foot

Conservative Management

Flexible or mild cavus feet respond well to non-surgical care:

• Custom orthotics — a custom lateral wedge (valgus posting) corrects hindfoot varus, metatarsal pads offload the forefoot, and arch accommodation reduces plantar fascia tension
• Extra-depth shoes with cushioning — accommodates claw toes and reduces metatarsal head pressure
• Ankle bracing — for chronic lateral ankle instability, a lace-up ankle brace reduces inversion sprain risk
• Physical therapy — peroneal strengthening and proprioception training for lateral ankle stability

Surgical Treatment

Rigid cavus feet with significant deformity, failed conservative management, or progressive neurological involvement frequently require surgical correction. Surgical options are tailored to each component of the deformity:

• Plantar fascia release — reduces the deforming tension on the arch
• First metatarsal dorsiflexion osteotomy (dorsiflexory wedge) — elevates the plantarflexed first metatarsal head, correcting the primary deforming force
• Peroneus longus to brevis tendon transfer — reduces first metatarsal plantarflexion force and augments peroneus brevis eversion strength
• Calcaneal osteotomy (Dwyer lateralizing) — shifts the heel laterally to correct varus alignment
• Claw toe correction — IP joint fusion and MTP joint release for rigid claw toes
• Triple arthrodesis — fusion of the subtalar, talonavicular, and calcaneocuboid joints for severe rigid deformity; provides definitive correction with reliable outcomes

Dr. Tom Biernacki, DPM

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Dr. Tom Biernacki, DPM is a double board-certified podiatrist and foot & ankle surgeon at Balance Foot & Ankle Specialists in Southeast Michigan. With over a decade of clinical experience, he specializes in heel pain, bunions, diabetic foot care, sports injuries, and minimally invasive surgery. Dr. Biernacki is a member of the APMA and ACFAS, and his patient education content on MichiganFootDoctors.com and YouTube has reached over one million views.