Medically reviewed by Dr. Tom Biernacki, DPM
Board-certified podiatric surgeon | Balance Foot & Ankle, Howell & Bloomfield Hills, MI
Last reviewed: May 2026
High-arched foot (pes cavus) that develops in adulthood — rather than being present since childhood — is a red flag for underlying neurological disease that has not yet been diagnosed. The specific direction of the arch deformity (anterior vs. posterior cavus) further points to different neurological or structural causes. Call (810) 206-1402 — cavus foot evaluation and neurological referral in Michigan.
Pes cavus (cavus foot) is a structural deformity characterized by an abnormally elevated longitudinal arch with associated plantar flexion of the forefoot on the hindfoot, producing a high-arched, rigid foot with characteristic claw toe deformity and lateral column overload. Unlike flexible flatfoot, which is usually idiopathic and postural, pes cavus is neurologic in origin in approximately 60-80% of cases — the most common underlying cause is Charcot-Marie-Tooth disease (hereditary motor and sensory neuropathy), followed by other peripheral neuropathies, spinal cord lesions, and cerebral palsy. Unilateral cavus foot, or progressive cavus deformity in an adult who previously had a normal arch, mandates a full neurologic workup because these presentations indicate an underlying neurologic lesion rather than idiopathic structural deformity. The foot deformity itself creates predictable problems: lateral ankle instability and recurrent sprains, peroneal tendon pathology, fifth metatarsal stress fractures, plantar fasciitis, and calcaneal stress fractures from the high calcaneal pitch and plantar fascia tension.
Pes Cavus: Etiology, Deformity Components, and Clinical Assessment
| Category | Details |
|---|---|
| Neurologic causes (60-80%) | Charcot-Marie-Tooth (CMT) Type 1 and 2 (most common — 50% of neurologic cavus); Friedreich ataxia; spinal dysraphism (spina bifida, tethered cord); poliomyelitis; Dejerine-Sottas; CIDP; hereditary spastic paraplegia; spinal cord tumor. CMT pattern: intrinsic wasting (claw toes) + peroneus brevis weakness + tibialis posterior overpull → varus hindfoot + plantarflexed first ray |
| Non-neurologic causes | Idiopathic (20-30%); residual clubfoot (congenital); compartment syndrome sequela; burn contracture; plantar fascia contracture; post-traumatic. Idiopathic cavus: typically bilateral, symmetric, familial, non-progressive — but exclude CMT before labeling as idiopathic |
| Deformity components | (1) Plantarflexed first ray: intrinsic-minus toe deformity drives first metatarsal head down. (2) Hindfoot varus: subtalar varus from plantarflexed first ray (forefoot-driven varus) or from posterior tibial muscle imbalance (hindfoot-driven varus). (3) Claw toes: intrinsic weakness → extensor substitution → MTP extension + PIP/DIP flexion. (4) Plantar fascia contracture: shortened plantar fascia further elevates arch and limits ankle dorsiflexion. (5) Calcaneal pitch elevation: calcaneus becomes more vertical, increasing ground reaction force on heel and plantar fascia tension |
| Coleman block test | PURPOSE: Determines if hindfoot varus is flexible (forefoot-driven) or fixed (hindfoot-driven). METHOD: Patient stands with lateral 2/3 of foot on a wooden block, allowing first metatarsal to hang free. INTERPRETATION: Hindfoot corrects to neutral or valgus = flexible varus driven by plantarflexed first ray (correct the forefoot, hindfoot corrects automatically). Hindfoot remains in varus = fixed hindfoot varus (requires calcaneal osteotomy or subtalar fusion). Clinical importance: guides surgical planning — flexible varus = first ray correction ± plantar fascia release sufficient; fixed varus = calcaneal osteotomy required |
| Radiographic assessment | Standing lateral X-ray: Meary angle (line through talus + 1st metatarsal) >4° of plantarflexion = cavus. Calcaneal pitch >30° = elevated. Hibbs angle (calcaneus-1st metatarsal) elevated in cavus. AP foot: forefoot adductus, metatarsal parallelism. Standing AP ankle: tibiotalar alignment, ankle varus tilt. Spine MRI if unilateral or progressive deformity (exclude syrinx, tethered cord) |
| Neurologic workup | Mandatory for all cavus feet: detailed family history (CMT is autosomal dominant — 50% risk per child); nerve conduction studies (CMT shows slowed conduction velocities in Type 1; axonal pattern in Type 2); genetic testing for PMP22 duplication (CMT1A most common); EMG for muscle involvement pattern; orthopedic surgery + neurology co-management for progressive neurologic cavus |
Pes Cavus Treatment: Conservative Management and Surgical Options
| Severity / Goal | Treatment Options | Rationale / Outcome |
|---|---|---|
| Conservative (mild-moderate, flexible, asymptomatic to mildly symptomatic) | Custom lateral-posted orthotic to control hindfoot varus and offload lateral column; accommodative padding for plantar calluses under metatarsal heads; wide toe-box footwear with deep heel cup; physical therapy for Achilles/plantar fascia stretching and intrinsic strengthening; ankle bracing (lace-up or semi-rigid) for recurrent lateral ankle sprains | Conservative management controls symptoms in 50-70% of mild-moderate flexible cavus; does not correct structural deformity; indicated when deformity is compensated and pain managed; most appropriate for CMT patients without progressive motor loss who have adapted |
| Plantar fascia release | Percutaneous or open plantar fascia release at medial calcaneal origin; corrects arch elevation from fascial contracture; often combined with first ray correction in surgical reconstruction | Part of the soft tissue release package in flexible cavus reconstruction; alone insufficient for fixed bony deformity; improves arch flexibility before osteotomy; 60-70% reduction in plantar fascia tension |
| First ray correction (flexible forefoot-driven) | Dorsiflexion osteotomy of first metatarsal (dorsiflexion base wedge osteotomy); corrects plantarflexed first ray; allows hindfoot to correct to neutral (confirmed by Coleman block). Combined with plantar fascia release and peroneus longus to brevis transfer (corrects peroneus longus overpull on first ray) | Primary surgical procedure for flexible cavus with forefoot-driven hindfoot varus; Coleman block test positive; 75-85% hindfoot correction after first ray osteotomy; prevents need for calcaneal osteotomy in appropriate candidates |
| Calcaneal osteotomy (fixed hindfoot varus) | Dwyer closing wedge osteotomy (lateral wedge removal from calcaneus — corrects hindfoot varus); Lateralizing calcaneal slide osteotomy; Z-osteotomy for large corrections. Combined with soft tissue releases and tendon transfers as needed | Required when Coleman block shows fixed hindfoot varus not corrected by unloading first ray; corrects heel strike pattern; reduces lateral ankle sprain risk; 80-85% success for hindfoot realignment |
| Claw toe correction | PIP joint fusion (PIPJ arthrodesis) for fixed claw toes; extensor tendon lengthening + MTPJ release for flexible claw toes; intrinsic transfer (Girdlestone-Taylor flexor-to-extensor) for dynamic deformity | Claw toes in cavus are driven by intrinsic weakness — flexible deformity in early stages, fixed over time; correction improves forefoot load distribution; performed concurrently with arch reconstruction |
| Triple arthrodesis (severe fixed deformity) | Fusion of subtalar, talonavicular, and calcaneocuboid joints; achieves permanent realignment of severe rigid cavus-varus deformity; last resort after failed osteotomy or in adult rigid deformity | 90% pain improvement for rigid cavus; eliminates hindfoot motion permanently; union rates 85-90%; reserved for failed prior correction, advanced deformity, or salvage situation; not appropriate for CMT patients with progressive neurologic involvement if further deformity expected |
At Balance Foot & Ankle in Howell and Bloomfield Hills, every cavus foot deformity is assessed with the Coleman block test to determine whether the hindfoot varus is forefoot-driven or fixed, and unilateral or progressive cavus triggers neurologic workup and NCS/EMG before any surgical planning — because the root cause (CMT vs. spinal lesion vs. idiopathic) determines the long-term surgical strategy and whether tendon transfers or fusions are appropriate. Call (810) 206-1402.
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High-arched (cavus) feet need a structured care plan
Cavus foot raises the risk of lateral ankle sprains, peroneal tendon pathology, and stress fractures. The right care plan starts with a precise structural exam (subtle vs reducible deformity matters), a Coleman block test, and imaging when indicated. Bracing and a properly built orthotic resolve the majority of symptomatic cases; surgery is reserved for progressive deformities.
Balance Foot & Ankle — Howell & Bloomfield Hills, MI: board-certified podiatrists, same-week appointments, most insurance accepted.
Book a Cavus-Foot Evaluation → or call (810) 206-1402
Related reading: peroneal tendon tear · best ankle braces · cavus foot overview
📋 Dr. Tom Biernacki, DPM, FACFAS answers:
Pes cavus (high arch foot) is caused by muscle imbalances, often neurological in origin — Charcot-Marie-Tooth disease is the most common underlying condition. Idiopathic (unknown cause) pes cavus is also common. High arches cause lateral ankle instability, metatarsal stress fractures, plantar fasciitis, and hammertoes due to abnormal pressure distribution. Treatment includes custom orthotics with lateral forefoot posting to redistribute load, ankle bracing for instability, physical therapy, and proper footwear with extra depth and cushioning. Severe structural deformity may require surgical reconstruction including tendon transfers and osteotomies.
