Tarsal Tunnel Syndrome: The Ankle’s Version of Carpal Tunnel

Quick answer: Tarsal Tunnel Syndrome Ankle Nerve Pain has multiple potential causes including mechanical, neurological, vascular, and inflammatory. The patterns we see most often are overuse, poorly-fitted shoes, and biomechanical imbalance. Red flags requiring urgent evaluation: warmth/redness (infection), inability to bear weight (fracture), and unilateral swelling without injury (DVT). Call (810) 206-1402.

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

Tarsal tunnel syndrome (TTS) is entrapment of the posterior tibial nerve as it passes through a narrow canal (the tarsal tunnel) behind the inner ankle bone. It is often called the “carpal tunnel of the foot” — and like its wrist counterpart, it causes burning, tingling, and numbness along the nerve’s distribution in the sole of the foot.

Anatomy: What Is the Tarsal Tunnel?

The tarsal tunnel is a narrow passageway behind and beneath the medial malleolus (the bony bump on the inside of the ankle). It contains the posterior tibial nerve, its two branches (the medial and lateral plantar nerves), the posterior tibial artery, and several tendons. Any condition that reduces the space within this tunnel can compress the posterior tibial nerve, causing tarsal tunnel syndrome.

Causes of Tarsal Tunnel Syndrome

• Flat feet (overpronation) — the most common cause; the collapsing arch stretches the posterior tibial nerve as the foot rolls inward
• Space-occupying lesions — ganglion cysts, lipomas, or accessory muscles within the tunnel reduce available space
• Ankle trauma — post-fracture scar tissue, swelling, or tendon injury can compress the tunnel contents
• Systemic conditions — diabetes, hypothyroidism, and rheumatoid arthritis can inflame nerve tissue or tunnel contents
• Varicose veins — enlarged veins within the tunnel create direct nerve compression

Symptoms of Tarsal Tunnel Syndrome

• Burning, tingling, or electric-shock pain along the inner ankle and sole of the foot
• Numbness in the heel, arch, or toes (in the distribution of the plantar nerves)
• Pain that worsens with prolonged standing, walking, or physical activity
• Symptoms that improve with rest and elevation
• Positive Tinel’s sign — tapping over the tarsal tunnel reproduces the tingling (the same way tapping the wrist reproduces carpal tunnel symptoms)

How Is Tarsal Tunnel Syndrome Diagnosed?

Diagnosis combines clinical examination with nerve conduction studies (EMG/NCS) to confirm posterior tibial nerve slowing, and MRI or ultrasound to identify any space-occupying lesion. Tarsal tunnel syndrome is frequently misdiagnosed as plantar fasciitis — the key difference is the burning/tingling neurological quality of TTS symptoms versus the mechanical morning pain of plantar fasciitis.

Treatment Options

Conservative

• Custom orthotics — correcting overpronation reduces the nerve stretch that is the most common cause of TTS; often highly effective
• Night splints — keep the foot in a neutral position overnight, reducing nerve irritation
• Anti-inflammatory medications — oral NSAIDs or targeted corticosteroid injection into the tarsal tunnel
• Physical therapy — nerve mobilization techniques (neural flossing) combined with strengthening

Advanced and Surgical

• Ultrasound-guided injection — precise corticosteroid delivery into the tarsal tunnel for targeted relief
• Surgical decompression (tarsal tunnel release) — the lacinate ligament forming the roof of the tunnel is released, creating more space for the nerve; highly effective when a structural cause is present
• Lesion excision — ganglion cysts or other space-occupying lesions are removed under local anesthesia

Differential Diagnosis: What Else Could It Be?

Not every case of tarsal tunnel syndrome is straightforward. In our clinic we routinely rule out three look-alike conditions before confirming the diagnosis. If your symptoms don’t match the classic presentation, one of these may explain the pain — which is why physical exam matters more than self-diagnosis.

Condition	How It Differs
Plantar fasciitis	Sharp morning heel pain at the medial calcaneal tubercle, NOT numbness or shooting pain into the toes.
Diabetic peripheral neuropathy	Bilateral stocking-glove distribution, progressive, affects toes first — NOT reproduced by Tinel’s at medial ankle.
S1 radiculopathy	Pain originates in low back, follows S1 dermatome, positive straight-leg raise.

Red Flags — When to See a Podiatrist Now

In Our Clinic: What We See

In-Office Treatment at Balance Foot & Ankle

If home treatment isn’t providing relief for your neuropathy, our podiatry team at Balance Foot & Ankle can help with same-day evaluations and advanced in-office care.