Cavus Foot (High Arch): Symptoms, Causes, Complications and Treatment

What is Cavus Foot (High Arch)?

Cavus foot (medically termed pes cavus) is an orthopedic condition that can affect both children and adults. It is characterized by an abnormally elevated longitudinal plantar arch. Specifically, the medial arch of the foot is excessively high. When standing, the foot makes contact with the ground primarily through the forefoot (ball of the foot) and the heel. The midfoot region, however, has little or no contact even when bearing the full load of body weight.

The Opposite of Flat Foot

Cavus foot is essentially the clinical opposite of flat foot (pes planus), where the arch is absent or collapsed. While flat foot is more common and frequently asymptomatic, cavus foot can cause significant pain, instability, and progressive deformity if not appropriately managed.

The condition varies widely in severity. At one end of the spectrum are mild high-arched feet, which cause only minor inconvenience. At the other extreme are severe structural deformities that significantly impair mobility and quality of life.

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Causes

Cavus foot is generally caused by a muscular imbalance between agonist and antagonist muscle groups in the foot and lower leg. The imbalance causes disproportionate forces that progressively mold the foot into an abnormally high-arched configuration.

Bilateral vs. Unilateral Presentation

The pattern of involvement provides important clues about the underlying etiology:

• Bilateral cavus foot (affecting both feet): More commonly genetic or familial in origin; associated with hereditary neurological conditions
• Unilateral cavus foot (one foot only): Strongly suggests a post-traumatic cause or a focal neurological lesion

Clinical alert: When a unilateral presentation cannot be explained by trauma, urgent brain and spinal cord MRI is recommended. This helps exclude progressive and potentially treatable conditions, such as a brain tumor. In growing children, a tethered spinal cord should also be considered. This neurological condition is caused by tissue adhesions that restrict the normal movement of the spinal cord within the vertebral canal.

The Four Main Cause Categories

1. Neurological Conditions

Neurological disorders are the most common identifiable cause of cavus foot. They cause progressive muscle weakness and imbalance that gradually deforms the foot architecture. Key conditions include:

• Hereditary motor and sensory neuropathies (HMSN), most notably Charcot-Marie-Tooth disease (CMT) (the single most frequent neurological cause of cavus foot), are a key consideration.
• Cerebral palsy.
• Post-stroke complications: spastic muscle imbalance.
• Anterior horn cell syndrome (e.g., poliomyelitis, spinal muscular atrophy)
• Spinal cord lesions, such as myelomeningocele and spinal cord tumors.
• Polyneuritic syndromes.
• Parkinson’s disease.
• Huntington’s chorea.
• Friedreich’s ataxia.
• Amyotrophic lateral sclerosis (ALS).
• Leprosy (in endemic regions).
• Roussy-Lévy syndrome, Strümpell-Lorrain disease, Pierre Marie hereditary ataxia.

2. Traumatic Events

Post-traumatic causes include:

• Compartment syndrome, especially after forearm or leg injuries, can result in muscle fibrosis and contracture.
• Talar (astragalus) fracture complications.
• Common peroneal nerve injury: this results in a loss of dorsiflexion and eversion strength.
• Knee dislocation with vascular or nerve injury.
• Scar tissue formation following burns, wounds, or deep tissue injuries.
• Vascular injuries affecting foot perfusion.
• Hindfoot instability following ligamentous injury.
• Distal tibia fractures or calcaneal fracture with malunion.

3. Untreated or Inadequately Treated Clubfoot

Talipes equinovarus (clubfoot), a congenital foot deformity, can develop into a secondary cavus foot deformity if not corrected or only partially treated during childhood.

4. Idiopathic and Other Causes

In some patients, no clear neurological, traumatic, or congenital cause is identified. Other recognized associations include:

• Tarsal coalition: an abnormal fusion of tarsal bones that restricts joint movement.
• Rheumatoid arthritis is an inflammatory joint disease that alters foot mechanics.
• Ankle osteoarthritis refers to degenerative joint changes.
• Plantar fibromatosis is a condition characterized by fibrous tissue proliferation within the plantar fascia.
• Subtalar joint axis anomalies (between the talus and calcaneus).
• Diabetic foot syndrome is a condition involving peripheral neuropathy, which leads to intrinsic muscle imbalance.

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Symptoms

While some individuals with cavus foot remain asymptomatic throughout their lives, particularly those with mild deformity, many experience a range of functional and painful manifestations.

Primary Symptoms

• Frequent ankle sprains often result from chronic lateral ankle instability. Because the high arch shifts weight toward the outer edge of the foot, the ankle becomes more vulnerable to inversion injuries.
• Foot pain, particularly at the plantar arch, often results from concentrated mechanical stress on specific areas. This stress occurs because of altered foot geometry.
• Knee pain is less common but can still happen due to abnormal lower limb biomechanics.

Location of Pain

Pain in cavus foot is typically localized at points of maximum load concentration:

• Heel (calcaneum): This area experiences increased impact loading at the posterior contact point.
• Cuboid bone: lateral midfoot overloading.
• Lateral foot border: the predominant contact area.
• First metatarsal head: this area bears forefoot loading at the medial column.

Practical Consequences

• Difficulty fitting standard shoes: The high arch and associated forefoot deformity can make it impossible to comfortably wear conventional footwear.
• Rapid and asymmetric shoe wear: shoes tend to wear down mostly on the lateral heel and outer sole.
• Painful calluses and corns, particularly those under the metatarsal heads and on the toes, often result from focal pressure concentrations.

In Neurological Cases

When cavus foot is secondary to a neurological condition, patients may also experience neuropathic pain, which can include burning, tingling, or electric shock-like sensations. These symptoms reflect the underlying nerve pathology.

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Consequences and Complications

The prognosis of cavus foot depends primarily on the underlying condition causing it. Progressive neurological disorders will generally lead to progressive foot deformity if not managed proactively.

Risks of Delayed Diagnosis or Treatment

A delayed diagnosis, or the prolonged and inappropriate use of orthotic insoles in a progressively worsening deformity without specialist review, can result in irreversible structural changes. These changes may eventually require surgical correction (arthrodesis).

Potential Complications

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Diagnosis

Clinical Evaluation

Diagnosis begins with a comprehensive medical history (anamnesis):

• Detailed symptom history: location, onset, triggers, and progression of pain.
• Family history: essential, given the hereditary nature of many neurological causes.
• History of trauma, surgery, or neurological conditions
• Assessment of symptom progression (stable vs. worsening)

The physical examination assesses the patient in both:

• Supine (lying) position: Used to assess passive joint mobility, muscle strength, and sensation.
• Standing and weight-bearing position: This position evaluates the true arch height and foot alignment under load.

Gait Analysis

Analysis of the patient’s walking pattern is a particularly important component, as it reveals:

• Lateral weight-bearing pattern: the characteristic “supinated” foot strike pattern of cavus foot.
• Steppage gait: a high knee lift to compensate for foot drop, often seen in neurological cases.
• Ankle stability during the gait cycle
• Signs of proximal biomechanical compensation (knee, hip, spine)

Imaging Studies

When indicated by the specialist, the following imaging modalities may be used:

• Weight-bearing foot X-rays are the most requested study. They are performed with the patient standing to assess the true arch height, calcaneal pitch angle, and metatarsal alignment under load.
• CT scan is superior for assessing bony detail, identifying tarsal coalition, and planning surgical correction.
• MRI is essential when a neurological cause, such as a spinal cord lesion or brain tumor, is suspected. It is also useful for assessing soft tissues, including tendons, the plantar fascia, and nerves.
• Ultrasound is used for the dynamic assessment of tendons and soft tissue structures.

Neurological Workup

When a neurological cause is suspected, further investigations are essential:

• Nerve conduction studies and electromyography (EMG) are used to identify the type and severity of neuropathy.
• Genetic testing, such as a CMT gene panel, can help identify hereditary neuropathies.
• Brain and spinal cord MRI, particularly for unilateral cavus foot without a clear traumatic cause.

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Treatment

Conservative (Non-Surgical) Management

Conservative treatment is the first-line approach and aims to:

• Reduce and redistribute plantar pressure, minimizing pain and protecting joint structures.
• Improve function and stability.
• Prevent or delay progression of deformity.

Orthotic Devices and Footwear

• Custom orthotic insoles (foot orthoses): Designed to distribute plantar pressure more evenly, accommodate the high arch, and provide lateral heel support to improve stability; essential in reducing pain and preventing recurrent ankle sprains
• Specialized cushioned footwear: Wide, deep toe boxes, cushioned soles, and adequate arch support; some patients benefit from custom-made shoes
• Ankle-foot orthoses (AFOs): In neurological cases with significant muscle weakness or foot drop

Physical Therapy

• Stretching exercises: Focus on the plantar fascia, Achilles tendon, and intrinsic foot muscles. These exercises help improve flexibility and reduce contracture.
• Muscle strengthening: Targeted exercises to strengthen the peroneal muscles, intrinsic foot muscles, and ankle stabilizers.
• Balance and proprioceptive training: To reduce ankle sprain risk and improve neuromuscular control.
• Manual therapy: Physiotherapeutic manipulation of the foot and ankle joints to maintain mobility and reduce stiffness.
• Callus management: Regular professional treatment of plantar calluses to relieve focal pain.

Surgical Treatment

Surgical intervention is indicated when:

• Pain is severe, persistent, and unresponsive to conservative measures
• Progressive neurological deformity threatens long-term function
• Structural changes are too advanced for orthotic management

Surgical procedures are selected based on the type and severity of deformity, the underlying cause, and the patient’s age and functional demands. They include:

Soft Tissue Procedures

• Plantar fascia release (plantar fasciotomy): Releases tight fibrous tissue contributing to the high arch, often combined with other procedures
• Achilles tendon lengthening: Corrects equinus deformity (plantarflexed hindfoot position)
• Tendon transfers: Reallocating tendon insertions to rebalance muscle forces; commonly used in neurological cavus foot (e.g., transferring the posterior tibial tendon)

Osteotomies (Bone Corrections)

Osteotomy involves surgically cutting and repositioning a bone to correct alignment:

• Calcaneal osteotomy: Corrects hindfoot varus (inverted heel alignment)
• Metatarsal osteotomy: Corrects forefoot plantarflexion (dropped metatarsal heads)
• Midfoot osteotomy: For midfoot structural deformity correction

Joint Stabilization Procedures

• Triple arthrodesis: Surgical fusion of three hindfoot joints (subtalar, talonavicular, and calcaneocuboid). This procedure is used in cases of severe, rigid, or recurrent deformity. It provides definitive stability but eliminates hindfoot motion.

Note: Surgical management of cavus foot is technically complex and carries risks including infection, wound healing problems, nerve injury, non-union of fused joints, and the need for revision surgery. It is reserved for patients with significant functional impairment unresponsive to conservative care.

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Sources and Bibliography

• Pes Cavus - Travis J. Seaman; Thomas A. Ball. StatPearls, NCBI Bookshelf
• Manoli A 2nd, Graham B. “The subtle cavus foot, ‘the underpronator’”. Foot & Ankle International. 2005;26(3):256–263.
• Gould N. “Graphical assessment of pes cavus”. Foot & Ankle. 1983;3(5):290–294.
• Valmassy RL, ed. Clinical Biomechanics of the Lower Extremities. Mosby; 1996.
• American Academy of Orthopaedic Surgeons (AAOS) Cavus Foot (High-Arched Foot)
• Mayo Clinic: Cavus Foot
• Steindler A. “The treatment of pes cavus (hollow claw foot)”. Archives of Surgery. 1921;2(2):325–337.