Cavus Foot Deformity: Assessment, Neurological Workup, and Management

Medically reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatric Surgeon — Balance Foot & Ankle, Howell & Bloomfield Township, MI. Last updated April 2026.

Cavus foot — a foot with an abnormally high longitudinal arch — is a structural deformity associated with disproportionately high plantar pressure, lateral ankle instability, peroneal tendinopathy, and stress fractures. Unlike flatfoot, which is often flexible and idiopathic, a significant proportion of cavus feet have an underlying neurological cause — and failure to identify and address the neurological etiology leads to recurrence after surgical correction.

Neurological Workup

The underlying neurological etiology should be actively sought in any patient with bilateral cavus deformity, cavus deformity with progressive worsening, or cavus deformity with intrinsic muscle weakness. Charcot-Marie-Tooth disease (CMT, hereditary motor and sensory neuropathy) is the most common neurological cause of cavus foot — typically presenting with bilateral symmetric deformity, peroneus brevis weakness (failure of single-leg heel rise), and intrinsic muscle atrophy. Other neurological causes: Friedreich’s ataxia, spinal cord tumors, diastematomyelia, and poliomyelitis. Neurological examination findings suggesting CMT: hammer toe deformity of the lesser toes, intrinsic muscle wasting, weakness on attempted heel eversion, and areflexia. Referral to neurology for EMG/nerve conduction studies and genetic testing is appropriate for patients with suspected neurological cavus.

Biomechanical Assessment and Management

The Coleman block test assesses hindfoot flexibility — placing a block under the lateral forefoot to eliminate the plantarflexed first ray demonstrates whether the hindfoot varus corrects (flexible, amenable to forefoot correction alone) or remains fixed (rigid, requiring hindfoot osteotomy). Conservative management: lateral wedge orthotics redistribute plantar pressure medially, reducing lateral column overload and stress fracture risk; ankle stabilization bracing addresses the recurrent lateral ankle instability. Surgical management is planned from distal to proximal: plantar fascia release (for fixed forefoot equinus), first metatarsal dorsiflexion osteotomy (for plantarflexed first ray), peroneus longus to brevis transfer (addressing the muscle imbalance driving forefoot plantarflexion), and calcaneal osteotomy for fixed hindfoot varus. Dr. Biernacki at Balance Foot & Ankle evaluates cavus foot deformity with clinical and radiographic assessment and coordinates neurological workup when indicated. Call (810) 206-1402 at our Bloomfield Township or Howell office.

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In-Office Treatment at Balance Foot & Ankle

If home care isn’t resolving your your foot or ankle concern, a visit with a board-certified podiatrist is the fastest path to accurate diagnosis and a personalized plan. At Balance Foot & Ankle Specialists, Dr. Tom Biernacki, Dr. Carl Jay, and Dr. Daria Gutkin offer same-day and next-day appointments at both our Howell and Bloomfield Township offices. We perform on-site diagnostic ultrasound, digital X-ray, conservative care, advanced regenerative treatments, and minimally invasive surgery when indicated.

Call (810) 206-1402 or request an appointment online. Most insurance plans accepted, including Medicare, Blue Cross Blue Shield, Aetna, Cigna, and United Healthcare.

Frequently Asked Questions

When should I see a podiatrist?

See a podiatrist for any foot or ankle pain that persists more than 2 weeks, doesn’t improve with rest, limits your daily activities, or is accompanied by swelling, numbness, or skin changes. People with diabetes or circulation problems should see a podiatrist regularly even without symptoms.

What does a podiatrist treat?

Podiatrists diagnose and treat all conditions of the foot, ankle, and lower leg including plantar fasciitis, bunions, hammertoes, toenail problems, heel pain, nerve pain, diabetic foot care, sports injuries, fractures, and foot deformities — both surgically and non-surgically.

What can I expect at my first podiatry visit?

Your first visit includes a full medical history, physical examination of your feet and gait, and in-office diagnostic imaging if needed (X-rays, ultrasound). We’ll discuss your diagnosis and create a plan tailored to your foot type. Most visits take 30–45 minutes.

Need Treatment at Balance Foot & Ankle?

Dr. Tom Biernacki, Dr. Carl Jay, and Dr. Daria Gutkin see patients at our Howell and Bloomfield Township offices.

Book Online or call (810) 206-1402

Most Common Mistake We See

The most common mistake we see is: Waiting too long before seeking care. Fix: any foot pain lasting more than 4 weeks, or any sudden severe symptom, deserves a professional evaluation rather than more rest.

Warning Signs That Need Same-Day Care