What Is Tarsal Tunnel Syndrome? For specialized treatment, see our tarsal tunnel syndrome treatment Michigan.
Tarsal tunnel syndrome (TTS) is compression of the tibial nerve as it passes through the tarsal tunnel—a narrow fibro-osseous channel on the inner side of the ankle, just behind and below the medial malleolus (the bony bump on the inside of your ankle). Like carpal tunnel syndrome in the wrist, tarsal tunnel syndrome produces pain, numbness, tingling, and burning sensations in the distribution of the compressed nerve—the bottom of the foot, heel, and toes.
The tarsal tunnel contains the tibial nerve (and its branches), the posterior tibial artery and vein, and three tendons (flexor digitorum longus, flexor hallucis longus, and tibialis posterior). The roof of the tunnel is formed by the flexor retinaculum—a thick fibrous band. Any process that increases pressure within this confined space can compress the tibial nerve and produce symptoms. TTS is significantly less common than carpal tunnel syndrome and is frequently misdiagnosed as plantar fasciitis, peripheral neuropathy, or ankle arthritis.
Causes and Risk Factors
TTS has multiple potential causes. Space-occupying lesions within the tunnel—ganglion cysts, lipomas, varicose veins, accessory muscles, or bony prominences from prior fractures—directly compress the nerve. Flat feet (pes planus) and overpronation stretch and angulate the tibial nerve as it courses through the tunnel, producing dynamic compression during gait. Ankle swelling from any cause (including chronic venous insufficiency, inflammatory arthritis, or trauma) increases tunnel pressure. Post-traumatic TTS can follow ankle fractures, ligament sprains, or direct contusion to the medial ankle.
Systemic conditions associated with TTS include diabetes (which also causes peripheral neuropathy—both conditions can coexist), hypothyroidism (which causes soft tissue swelling), and rheumatoid arthritis (synovial inflammation expands tunnel contents). Some cases are idiopathic with no identifiable cause found even at surgical exploration.
Symptoms
TTS produces symptoms primarily in the distribution of the tibial nerve and its branches. Patients describe burning pain, numbness, tingling, or electric shock sensations along the inner ankle and the sole of the foot. Symptoms are often worse with prolonged standing, walking, or tight footwear that compresses the medial ankle, and may improve with rest and elevation. Some patients report symptoms worse at night, with the sensation of needing to move or massage the foot for relief.
Physical examination findings include a positive Tinel’s sign—tapping over the tarsal tunnel reproduces or radiates tingling into the foot. Tenderness over the tibial nerve path and a positive dorsiflexion-eversion test support the diagnosis. Nerve conduction studies (NCS) and EMG can confirm nerve compression and assess severity, though a normal NCS does not rule out TTS—sensitivity is only 60–80%.
Diagnosis and Differential
Diagnosis of TTS is primarily clinical—based on history, symptom distribution, and physical examination findings. MRI of the ankle is valuable for identifying space-occupying lesions within the tunnel (ganglion cysts, accessory muscles, lipomas, varicosities) and planning surgical decompression. Differential diagnosis includes plantar fasciitis (heel pain without tingling in the sole), peripheral neuropathy (typically bilateral, stocking distribution), lumbar radiculopathy (pain from the spine), and Baxter’s nerve entrapment (branch of lateral plantar nerve causing isolated heel pain). TTS and plantar fasciitis can coexist—approximately 10% of patients with refractory plantar fasciitis have concurrent TTS.
Treatment
Conservative Treatment
Conservative treatment is the appropriate first step for most TTS cases. Custom orthotics with medial arch support address overpronation and reduce nerve traction during gait—this is the most consistently effective conservative intervention. Anti-inflammatory medications (NSAIDs) reduce perineural inflammation. Corticosteroid injection into the tarsal tunnel provides temporary relief in approximately 50–60% of patients and can be both diagnostic and therapeutic. Activity modification, supportive footwear, and ankle bracing reduce mechanical stress. Physical therapy addressing ankle joint mobility and intrinsic foot muscle strengthening provides supplemental benefit.
Surgical Decompression
Surgical tarsal tunnel release is indicated when conservative treatment fails after 3–6 months, when a space-occupying lesion requires removal, or when NCS demonstrates severe nerve compression with axonal loss. The procedure involves releasing the flexor retinaculum under direct vision to decompress the tunnel, identifying and removing any intrinsic lesions, and releasing the individual branches of the tibial nerve as needed. Recovery takes 3–6 months; full nerve recovery may take 12–18 months. Patients with an identifiable space-occupying lesion, positive preoperative Tinel’s sign, and symptoms for less than 1 year have the most favorable surgical outcomes.
Frequently Asked Questions
Is tarsal tunnel syndrome the same as plantar fasciitis?
No—they are distinct conditions, though they can coexist and are sometimes confused with each other. Plantar fasciitis is inflammation of the plantar fascia causing heel pain worst with the first steps in the morning. Tarsal tunnel syndrome is nerve compression at the ankle causing tingling, burning, and numbness along the bottom of the foot and toes. The key distinction is the neurological quality of TTS symptoms (electric, burning, tingling) versus the mechanical aching of plantar fasciitis. Tapping over the tarsal tunnel (Tinel’s sign) reproduces TTS symptoms but not plantar fasciitis. A podiatrist can distinguish between the two with clinical examination and, if needed, nerve conduction studies.
Can flat feet cause tarsal tunnel syndrome?
Yes. Flat feet and excessive pronation are among the most common contributing factors to tarsal tunnel syndrome. As the foot pronates, the tibial nerve is subjected to increased traction and angulation as it passes through the tunnel. Custom orthotics with medial arch support that correct overpronation are often the most effective conservative treatment for TTS in flatfooted patients. In some cases, surgical correction of the flatfoot deformity combined with tarsal tunnel release provides better long-term outcomes than nerve release alone.
Will tarsal tunnel syndrome go away on its own?
Mild TTS with an identifiable, correctable cause (such as overpronation addressed with orthotics) can improve substantially with conservative treatment. However, TTS caused by a space-occupying lesion, significant structural compression, or longstanding nerve injury is unlikely to resolve without intervention. Prolonged nerve compression leads to progressive nerve damage that becomes harder to reverse. If conservative treatment does not produce meaningful improvement within 3–4 months, evaluation for surgical decompression is appropriate—earlier treatment generally produces better nerve recovery.
Medical References & Sources
- PubMed Research — Tarsal Tunnel Syndrome Studies
- American Orthopaedic Foot & Ankle Society — Tarsal Tunnel Syndrome
- PubMed Research — Tarsal Tunnel Surgical Outcomes
Dr. Tom Biernacki, DPM is a board-certified podiatric surgeon at Balance Foot & Ankle in Howell and Bloomfield Hills, Michigan. He evaluates and treats tarsal tunnel syndrome with nerve conduction studies, orthotic therapy, corticosteroid injection, and surgical decompression when indicated.
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Dr. Tom Biernacki, DPM is a double board-certified podiatrist and foot & ankle surgeon at Balance Foot & Ankle Specialists in Southeast Michigan. With over a decade of clinical experience, he specializes in heel pain, bunions, diabetic foot care, sports injuries, and minimally invasive surgery. Dr. Biernacki is a member of the APMA and ACFAS, and his patient education content on MichiganFootDoctors.com and YouTube has reached over one million views.