High Arch Foot Causes 2026: Pes Cavus, CMT & Neurological Causes

High arches are the overlooked sibling of flat feet in podiatric practice — far less common but often more clinically significant because they are more frequently caused by neurological disease. In our clinic, pes cavus that is developing or worsening in an adult patient triggers neurological evaluation before we treat the foot itself, because the foot is telling us something is wrong upstream. A child presenting with progressive toe clawing and high arch formation who has been labeled “just a family trait” may have Charcot-Marie-Tooth disease — diagnosing it changes the entire family’s medical picture, not just the foot treatment plan.

What Is a High Arch (Pes Cavus)

Pes cavus — from the Latin for “hollow foot” — is defined by an excessively high medial longitudinal arch that does not flatten with weight bearing. Unlike flexible flat foot (where the arch normalizes on tiptoe), the pes cavus foot maintains its elevated arch under load. The structural picture involves three key deformities that develop together: plantarflexion of the forefoot relative to the hindfoot (driving the metatarsal heads toward the ground), calcaneal varus (the heel tilts inward, concentrating load on the lateral heel), and lesser toe clawing from intrinsic muscle weakness with preserved extrinsic flexor function.

The arch height itself is measured by the Chippaux-Smirak index (footprint method), the arch angle, or — more clinically useful — the Coleman block test. The Coleman block test determines whether the hindfoot varus is flexible (correctable, driven by the plantarflexed first metatarsal) or fixed (requires hindfoot surgery). A flexible hindfoot corrects when a block is placed under the lateral forefoot, taking the plantarflexed first ray out of the equation — this is critical for surgical planning because flexible hindfoot cavus can be corrected through forefoot procedures alone.

Neurological Causes: Why This Category Matters Most

Neurological disease causes pes cavus through a common mechanism: selective weakness of specific foot muscle groups with preserved strength in antagonist muscles, creating an imbalance that deforms the foot progressively over years. The muscles that are weakened — and which are spared — depend on the specific neurological diagnosis, but the most common pattern in hereditary neuropathy is intrinsic foot muscle wasting with preserved extrinsic muscle strength.

The intrinsic muscles (lumbricales, interossei) extend the toe interphalangeal joints and flex the metatarsophalangeal joints. When they are lost, the extrinsic long toe flexors (FDL, FHL) and extensors become unopposed at the IP joints, producing clawing. Simultaneously, peroneus longus (which plantarflexes the first ray) is often preserved or relatively preserved while tibialis anterior (which dorsiflexes the foot) is weakened — this imbalance drives the forefoot into plantarflexion and elevates the arch.

Charcot-Marie-Tooth Disease: The Foremost Cause

Charcot-Marie-Tooth disease (CMT) — properly called hereditary motor and sensory neuropathy (HMSN) — is the most common inherited peripheral neuropathy, affecting 1 in 2,500 people worldwide. It is the single most important cause of pes cavus to identify because it is inherited in an autosomal dominant pattern (50% chance of transmission to each child), it affects the hands and upper extremities in addition to the feet (potentially affecting career and fine motor function), and it influences family genetic counseling profoundly.

CMT Type 1A (the most common subtype, caused by PMP22 gene duplication) is a demyelinating neuropathy — nerve conduction velocity is dramatically slowed (below 38 m/s in the median nerve) on NCS/EMG. CMT Type 2 is an axonal neuropathy with relatively preserved conduction velocity but reduced amplitudes. Clinically, the foot presentation of CMT is a progressive bilateral pes cavus with toe clawing, distal leg muscle wasting (“inverted champagne bottle” leg appearance), high-stepping gait from foot drop, and reduced ankle reflexes.

The diagnostic pathway when CMT is suspected: nerve conduction studies first (NCS is the most sensitive initial test), then genetic testing. Over 80 CMT-causing gene mutations have been identified — a targeted gene panel covers the most common variants efficiently. Orthopedic treatment of CMT-related cavus includes bracing (AFO for foot drop), soft tissue releases (plantar fascia release, Achilles lengthening, TPLO), tendon transfers, and in severe cases osteotomies and arthrodesis. These procedures treat the foot deformity but do not alter the neurological progression.

Structural, Congenital, and Post-Traumatic Causes

Clubfoot (talipes equinovarus) residual deformity is the most common structural cause. Even with excellent early treatment (Ponseti casting method), a percentage of clubfoot patients develop pes cavus as a residual deformity — particularly if the forefoot component of the clubfoot was incompletely corrected. The cavus in clubfoot is typically combined with residual supination and adductus, distinguishing it from neurological cavus.

Post-traumatic pes cavus develops after compartment syndrome of the foot or leg, which causes ischemic contracture and fibrosis of muscle groups. The classic compartment syndrome cavus presents years after a crush injury or prolonged limb compression — intrinsic muscles scar and shorten, pulling the toes into clawing and the arch into elevation. It is typically rigid, painful, and more likely to require surgical correction.

Burn contractures of the plantar surface produce a plantar fascia and skin contracture that limits arch mobility and can create fixed cavus over time, particularly in childhood burns during growth phases.

Idiopathic and Hereditary High Arches

Approximately 20–30% of pes cavus cases have no identifiable neurological or structural cause after thorough evaluation. These are classified as idiopathic or “essential” pes cavus. Many represent mild or fruste forms of hereditary neuropathy where the genetic mutation produces only mild phenotypic expression — the cavus is the sole manifestation because the neuropathy is too mild to cause measurable conduction slowing or clinically apparent weakness.

Familial high arches — where multiple family members have high arches without neurological symptoms — often fall into this category. These patients typically have flexible pes cavus with normal neurological examination, normal NCS, and no progressive element. They experience primarily mechanical symptoms (lateral foot pain, ankle instability, metatarsalgia) without neurological symptoms. Treatment is entirely orthopaedic — accommodative orthotics, lateral heel posting, and rarely surgical correction for severely symptomatic cases.

Biomechanical Consequences of High Arches

Pes cavus creates a rigid, poorly shock-absorbing foot with aberrant load distribution that produces predictable injury patterns. The high arch does not flatten during loading — unlike the normal foot, which supinates at heel strike, pronates through midstance (absorbing impact), and resupinates at push-off. The cavus foot locks in supination throughout the gait cycle, forcing load to the lateral forefoot and heel with no dissipation mechanism.

The specific biomechanical consequences include: lateral ankle instability (hindfoot varus alignment increases the risk of lateral ankle inversion sprains by 3-4×), fifth metatarsal stress fractures (the Jones fracture zone at the base of the 5th metatarsal is particularly vulnerable under lateral forefoot overload), peroneal tendon tears (constant lateral stress from a varus heel abrades the peroneus brevis against the posterior fibular groove), metatarsalgia (the plantarflexed lesser metatarsal heads hammer the forefoot with each step), and plantar fascia tightness (the high arch keeps the plantar fascia chronically shortened and taut, with less capacity to absorb impact).

Pain Patterns in Pes Cavus

The specific pattern of pain in a high-arch foot provides important clues about the predominant structural problem. Patients with pes cavus don’t always hurt in the same place — they hurt where their foot structure concentrates load.

Lateral ankle and hindfoot pain suggests recurrent ankle instability from the varus heel alignment. These patients have a history of multiple ankle sprains and often walk on the outer edge of their shoe, which shows excessive lateral wear. The lateral ankle ligaments are under chronic stress from the varus position even without a discrete sprain event.

Lateral forefoot and 5th metatarsal pain indicates the overloaded lateral column. Callus formation under the 4th and 5th metatarsal heads is characteristic. Stress fractures of the 5th metatarsal base (Jones fracture) occur here at a much higher rate than in normal feet — the bone is repeatedly loaded without adequate arch-mediated shock absorption.

Ball-of-foot pain under the lesser metatarsal heads (metatarsalgia) reflects the plantarflexed metatarsal heads being driven into the ground with each step. The lack of arch pronation means the metatarsal heads take direct impact rather than a glancing load.

Toe pain and dorsal corns come from the clawing deformity — toes retroflexed at the MTP and flexed at the IP joints create dorsal pressure points in shoes.

Recommended Products for High Arch Pain

The Most Common Diagnostic Mistake

The most common mistake with high arches is treating them as a mechanical problem and missing the neurological cause. A patient presents with high arches, lateral foot pain, and multiple ankle sprains — they’re given an orthotic and told to come back in 6 weeks. Meanwhile, they have Charcot-Marie-Tooth disease that’s now affecting their hands, their children’s feet are developing cavus, and the family has no diagnosis. The rule we follow: any cavus that is progressive (arch higher than it was 1–2 years ago), asymmetric (worse on one side), or associated with toe clawing, distal leg weakness, or reduced ankle reflexes requires nerve conduction studies and genetic counseling referral before orthotic fitting. Progressive or asymmetric pes cavus is neurological until proven otherwise.

Red Flags: When High Arches Are a Medical Urgency

In-Office Treatment at Balance Foot & Ankle

At Balance Foot & Ankle, we evaluate pes cavus with the Coleman block test, neurological examination, weight-bearing foot X-rays, and when indicated, nerve conduction studies. Dr. Tom Biernacki provides the complete spectrum from accommodative orthotics and lateral posting to surgical correction — including plantar fascia release, peroneus longus-to-brevis tendon transfer, calcaneal osteotomy, and metatarsal osteotomies for symptomatic pes cavus. We coordinate neurological referral when CMT or other hereditary neuropathy is suspected.

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Frequently Asked Questions

Sources

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3. Beals TC, Manoli A. The peek-a-boo heel sign in the evaluation of hindfoot varus. Foot. 1996;6(4):205-206.
4. Coleman SS, Chesnut WJ. A simple test for hindfoot flexibility in the cavovarus foot. Clin Orthop Relat Res. 1977;(123):60-62.
5. Wicart P. Cavus foot, from neonates to adolescents. Orthop Traumatol Surg Res. 2012;98(7):813-828.
6. Burns J, et al. Interventions for the prevention and treatment of pes cavus. Cochrane Database Syst Rev. 2007;(4):CD006154.

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.