Cavus

Modern Study Review (AI-Generated)

High-Yield Summary

Pes cavus is a complex foot deformity characterized by an abnormally high medial longitudinal arch, often secondary to underlying neuromuscular disorders. Accurate diagnosis requires a multidisciplinary approach integrating clinical, neurological, and imaging assessments to identify the etiology. Early recognition and targeted treatment aim to improve pain, function, and prevent progression. Management ranges from conservative measures to surgical correction depending on severity and underlying cause.

Key Diagnostic Findings

Anatomy

• Pes Cavus: Elevated medial longitudinal arch with associated forefoot equinus, hindfoot varus, and claw toes in some cases.
• Calcaneal Pitch: Angle >30° suggests hindfoot involvement, often linked to gastrocnemius weakness.

Clinical Presentation

• Deformity: May be unilateral or bilateral; often progressive.
• Neurological Signs: Muscle weakness, atrophy, sensory loss, and reflex changes depending on underlying pathology.
• Common Symptoms: Pain, instability, callosities, difficulty with footwear, and gait abnormalities.

Imaging

• Weight-bearing Foot X-rays: Assess arch height, calcaneal pitch, and alignment of forefoot and hindfoot.
• MRI/CT: Useful for soft tissue and neural structure evaluation if indicated.
• Electrodiagnostic Studies: EMG and nerve conduction studies to identify neuromuscular causes.

Classification Systems

• No universally accepted classification solely for pes cavus; however, clinical classification often based on:
• Etiology: Neuromuscular (e.g., Charcot-Marie-Tooth [CMT], polio), congenital, traumatic.
• Deformity Location: Forefoot cavus vs. hindfoot cavus.
• Severity: Flexible vs. rigid deformity (important for treatment planning).

Current Gold Standard Treatment

Non-operative Indications and Treatment

• Indications: Mild deformity, flexible foot, minimal pain or functional impairment, early-stage neuromuscular disease.
• Treatment:
• Orthotic management (custom insoles to redistribute pressure).
• Physical therapy focusing on strengthening, stretching, and range of motion.
• Neurological consultation and multidisciplinary care.
• Monitoring for progression.

Operative Indications and Treatment

• Indications:
• Rigid deformity causing pain, instability, or ulceration.
• Progressive deformity despite conservative care.
• Significant functional impairment.
• Surgical Options:
• Soft tissue procedures (e.g., tendon transfers, plantar fascia release).
• Osteotomies (e.g., dorsal wedge osteotomy of the metatarsals or calcaneus).
• Arthrodesis in severe, rigid deformities.
• Address underlying neuromuscular imbalance when possible.

Modern Complications & Outcomes

Complications

Outcomes

• Early diagnosis and tailored treatment improve pain and function.
• Surgical correction yields good outcomes in rigid deformities but requires careful patient selection.
• Multidisciplinary care optimizes long-term management, especially in progressive neuromuscular disorders.
• Functional goals focus on pain relief, improved gait, and prevention of ulceration.

Classic Clinical Notes

Cavus

Approach to Pes Cavus – Assessment

• It may not be initially clear what the initial diagnosis is.
• Consider the differential:

Neuromuscular:

• Muscular – muscular dystrophy
• Long Tract and Central Disease – Friedrich’s ataxia, spinocerebellar degeneration, cerebral palsy, syrinx, tumour, tethered cord, dysraphism, diastematomyelia
• Anterior Horn Cell – polio, spinal muscular atrophy (SMA)
• Peripheral Nerves – Charcot-Marie-Tooth (CMT), tumour

Congenital:

• Arthrogryposis

Traumatic:

• Compartment syndrome, crush injury, burn

• Most commonly: CMT, polio, Friedrich’s ataxia, spinal cord tumour, dysraphism, diastematomyelia, tethered cord

• Do a careful history
• Do a full neurological examination
• Do a careful physical examination of the lower extremity

• Additional useful tests: CK, EMG, nerve conduction studies, nerve or muscle biopsy
• Get a neurologist consult
• Get a physiatrist consult
• Get them hooked up with physio for strengthening and range of motion

Questions to Ask:

• Is the deformity bilateral or unilateral?
• Bilateral: CMT, diabetic neuropathy, Friedrich’s ataxia, spinal cord tumour, spinal dysraphism, diastematomyelia, tethered cord
• Unilateral: polio, trauma, incomplete spinal cord injury, crush

• Is the cavus deformity hindfoot or forefoot?
• A calcaneal pitch of >30 is more suggestive of gastrocnemius weakness secondary to polio, cauda equina, incomplete spinal cord injury, or meningomyelocele
• A calcaneal pitch of [incomplete in original notes]

Last Updated on January 25, 2026 by orthonet