Tarsal Tunnel Syndrome: Nerve Compression in the Ankle and Foot

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

What Is Tarsal Tunnel Syndrome?

Tarsal tunnel syndrome is a compressive neuropathy of the posterior tibial nerve as it travels through the tarsal tunnel — a narrow fibro-osseous canal on the medial side of the ankle formed by the flexor retinaculum and the underlying bones. The condition is analogous to carpal tunnel syndrome in the wrist and produces similar symptoms of nerve compression including pain, burning, tingling, and numbness.

The posterior tibial nerve divides into the medial plantar nerve, lateral plantar nerve, and calcaneal branches within or just distal to the tarsal tunnel. Compression at any point along this pathway can produce symptoms in the corresponding distribution — the arch, heel, ball of the foot, or toes depending on which branch is affected.

Tarsal tunnel syndrome can be caused by anything that reduces the space within the tunnel or increases pressure on the nerve. Common causes include flat feet or overpronation that stretches the nerve, ganglion cysts or varicose veins within the tunnel, scar tissue from previous ankle sprains, and systemic conditions like diabetes or hypothyroidism that make nerves more susceptible to compression.

Symptoms and How Tarsal Tunnel Syndrome Is Diagnosed

The hallmark symptom is burning, tingling, or electrical shooting pain along the inner ankle that radiates into the arch and bottom of the foot. Symptoms are typically worse with prolonged standing or walking and often intensify at night. Some patients describe numbness or a sensation that the foot is falling asleep. Unlike plantar fasciitis, the pain from tarsal tunnel syndrome has a distinctly neurological character.

Diagnosis begins with a thorough clinical examination. The Tinel sign — tapping over the tarsal tunnel to reproduce tingling or electrical sensations shooting into the foot — is a key diagnostic finding. Your podiatrist will also assess foot alignment, check for masses within the tunnel, and evaluate sensation throughout the foot.

Electrodiagnostic studies including nerve conduction velocity testing and electromyography confirm the diagnosis and help determine the severity of nerve involvement. Advanced imaging with MRI can identify space-occupying lesions such as ganglion cysts, lipomas, or varicose veins that may be compressing the nerve and guide treatment planning.

Conservative Treatment Options

Initial treatment focuses on reducing pressure on the posterior tibial nerve and controlling inflammation. Custom orthotic devices that control overpronation are foundational — by supporting the medial arch and preventing excessive flattening, they reduce the tensile and compressive forces on the nerve within the tarsal tunnel.

Oral anti-inflammatory medications and neuropathic pain medications such as gabapentin can help manage symptoms during the acute phase. Corticosteroid injections into the tarsal tunnel under ultrasound guidance can provide significant relief by reducing inflammation around the nerve, though repeated injections should be limited.

Physical therapy plays an important role with nerve gliding exercises, posterior tibial nerve mobilization techniques, and calf stretching to improve the nerve’s ability to slide freely within the tunnel. Activity modification — avoiding prolonged standing on hard surfaces and wearing supportive footwear — reduces the repetitive stress that aggravates the condition.

When Surgery Is Recommended: Tarsal Tunnel Release

Surgical intervention is recommended when conservative treatment fails to provide adequate relief after three to six months, when electrodiagnostic studies show progressive nerve deterioration, or when an identifiable space-occupying lesion is compressing the nerve. The goal of surgery is to decompress the tarsal tunnel and release all points of nerve entrapment.

The procedure — called a tarsal tunnel release — involves incising the flexor retinaculum (the ligament forming the roof of the tunnel) to open the canal and free the nerve. The surgeon carefully traces the posterior tibial nerve and its branches, releasing any adhesions, removing cysts or masses, and ensuring each branch passes freely through its respective tunnel.

The surgery is performed as an outpatient procedure under regional or general anesthesia. Recovery involves two weeks of non-weight-bearing followed by a gradual return to walking in a supportive boot. Most patients experience progressive improvement in nerve symptoms over three to six months as the nerve heals and regenerates, though some numbness may persist if the nerve was severely compressed before surgery.

Tarsal Tunnel Syndrome vs Plantar Fasciitis: Key Differences

Tarsal tunnel syndrome and plantar fasciitis are frequently confused because both cause pain in the bottom of the foot. However, the character and distribution of pain differ significantly. Plantar fasciitis produces a sharp, localized heel pain that is worst with the first steps in the morning and improves with activity. Tarsal tunnel syndrome causes burning, tingling, and numbness that often worsens with activity and radiates from the inner ankle into the arch and toes.

The location of tenderness provides another distinguishing clue. Plantar fasciitis produces tenderness at the medial calcaneal tubercle — the bottom of the heel where the fascia attaches. Tarsal tunnel syndrome produces tenderness and a positive Tinel sign behind and below the medial malleolus — the bony bump on the inner ankle.

These conditions can coexist, and one can mask or be mistaken for the other. A thorough clinical examination with appropriate electrodiagnostic testing ensures accurate diagnosis and prevents patients from receiving prolonged treatment for the wrong condition.

Risk Factors and Prevention Strategies

Flat feet and overpronation are the most common biomechanical risk factors for tarsal tunnel syndrome. The excessive inward rolling of the foot during gait stretches the posterior tibial nerve and increases pressure within the tarsal tunnel. Addressing this with proper arch support and motion-control footwear is the most effective preventive strategy.

Previous ankle injuries — particularly ankle sprains that cause scarring or swelling near the tarsal tunnel — increase the risk of nerve compression. Patients with diabetes, hypothyroidism, or other systemic conditions that affect nerve health are also more susceptible and should be vigilant about foot symptoms.

Occupations that require prolonged standing on hard surfaces, repetitive ankle movements, or wearing constrictive footwear increase the risk. Maintaining a healthy weight, wearing properly supportive shoes, and performing regular calf stretching and ankle mobility exercises all help reduce the likelihood of developing tarsal tunnel syndrome.

Expert Tarsal Tunnel Treatment at Balance Foot & Ankle

At Balance Foot & Ankle Specialists, Dr. Tom Biernacki uses advanced diagnostic techniques including in-office nerve conduction studies and high-resolution ultrasound to accurately identify the cause and location of nerve compression. This comprehensive evaluation ensures each patient receives a targeted treatment plan rather than a generic approach.

When surgical intervention is needed, our meticulous decompression technique traces every branch of the posterior tibial nerve to ensure complete release. We combine the tarsal tunnel release with correction of any contributing biomechanical factors to prevent recurrence and optimize long-term outcomes.

With locations in Howell and Bloomfield Hills, we serve patients throughout Southeast Michigan who are dealing with unexplained burning, tingling, or numbness in their feet. Early diagnosis is critical — if you are experiencing nerve-type symptoms in your foot, schedule an evaluation before permanent nerve damage occurs.