Tarsal Tunnel Syndrome Ankle Pain 2026 | DPM

Nerve Branch	Distribution	Structures at Risk	Clinical Findings	Entrapment Point
Posterior Tibial Nerve (main trunk)	Plantar heel; arch; toes	Under flexor retinaculum; tarsal tunnel	Diffuse plantar burning; Tinel at medial ankle	Tarsal tunnel (medial malleolus to calcaneus)
Medial Plantar Nerve	Medial 3.5 toes; medial plantar surface	Medial plantar compartment	Burning medial sole; runners	Master knot of Henry (navicular-1st met crossing)
Lateral Plantar Nerve	Lateral 1.5 toes; lateral plantar	Lateral plantar compartment	Burning lateral sole; Baxter nerve compression	Abductor hallucis muscle tunnel
First Branch Lateral Plantar (Baxter Nerve)	Abductor digiti minimi; heel	Between abductor hallucis and quadratus plantae	Medial plantar heel pain; mimics plantar fasciitis; no morning pain pattern	Between FHB origin and quadratus plantae

Treatment	Indication	Protocol	Success Rate	Notes
Activity Modification + Supportive Footwear	All patients; first-line	Reduce standing; supportive arch shoe; avoid flat shoes	30-40% relief for mild symptoms	Reduces nerve compression from prolonged loading
Custom Orthotics	Pronation-associated tarsal tunnel	Medial arch support; reduces valgus hindfoot strain on flexor retinaculum	50-60% improvement in pronation-driven cases	Addresses biomechanical cause of nerve tethering
Corticosteroid Injection (perineural)	Moderate symptoms; confirmed TTS	Ultrasound-guided injection into tarsal tunnel adjacent to PTN	60-70% temporary relief; diagnostic if confirms TTS	Repeated injections risk tendon damage in tarsal tunnel
Nerve Conduction Study / EMG	Diagnostic; confirms TTS and severity	Electrodiagnostic study of posterior tibial nerve across tarsal tunnel	Sensitivity 60-90%; specificity 70-90%	Normal NCS does not rule out TTS (clinical diagnosis)
Surgical Tarsal Tunnel Release	Failed 6-12 months conservative; confirmed TTS on EDX	Release flexor retinaculum; decompress all 4 tunnels (medial, lateral, calcaneal, Baxter)	70-90% if structural cause identified; 40-60% if idiopathic	Best results when space-occupying lesion (ganglion, varicosity) is cause

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What Is Tarsal Tunnel Syndrome?

Tarsal tunnel syndrome (TTS) is compression of the posterior tibial nerve within the tarsal tunnel — a fibro-osseous canal along the inner ankle bordered by the medial malleolus above and the flexor retinaculum below. Like carpal tunnel syndrome in the wrist, sustained pressure on this nerve produces progressive burning, tingling, numbness, and electric-shock pain that radiates from the inner ankle into the arch, heel, and sometimes all five toes.

At Balance Foot & Ankle PLLC, Dr. Tom Biernacki sees tarsal tunnel syndrome in a many patients — from flatfoot deformity that collapses the arch and stretches the nerve, to post-traumatic scarring after an ankle sprain, to space-occupying lesions such as ganglion cysts, lipomas, or varicose veins inside the tunnel. Identifying and correcting the underlying cause is the key to lasting relief.

Common Causes of Tarsal Tunnel Syndrome

Anything that increases pressure inside the tarsal tunnel or tethers the posterior tibial nerve can trigger TTS. The most frequent culprits include:

Flatfoot deformity (pes planus): Overpronation causes the heel to roll inward, placing traction stress on the posterior tibial nerve with every step. This is the single most common biomechanical driver of TTS seen at our clinic.

Ankle sprains and trauma: Scar tissue, fibrosis, or post-traumatic swelling inside the tunnel can compress or tether the nerve. Patients sometimes develop TTS weeks to months after what seemed like a routine sprain.

Space-occupying lesions: Ganglion cysts, lipomas, varicose veins, and enlarged tendons can physically crowd the tunnel and compress the nerve directly.

Systemic conditions: Diabetes, hypothyroidism, and rheumatoid arthritis all increase susceptibility to nerve compression by affecting nerve function, joint inflammation, and soft tissue composition.

Idiopathic TTS: In some patients no clear anatomical cause is found. Comprehensive electrodiagnostic workup and imaging are essential in these cases.

Signs and Symptoms

The hallmark of tarsal tunnel syndrome is a burning, tingling, or electric quality to the pain — distinctly different from the sharp, point-specific pain of plantar fasciitis. Patients often describe symptoms that are:

Located along the inner ankle, radiating into the arch and sole. Worse with prolonged standing, walking, or at night. Temporarily relieved by rest or elevating the foot. Associated with a positive Tinel’s sign — tapping over the tarsal tunnel reproduces the electric tingling sensation.

Because TTS can mimic plantar fasciitis, peripheral neuropathy, or lumbar radiculopathy, accurate diagnosis requires a thorough clinical examination combined with nerve conduction studies and, when warranted, diagnostic ultrasound or MRI.

Diagnosis: What to Expect at Balance Foot & Ankle

Dr. Biernacki performs a systematic evaluation that begins with a detailed history of symptom onset, activity levels, footwear habits, and any prior ankle injuries. Physical examination assesses foot alignment, pronation, Tinel’s sign at the tarsal tunnel, and neurological deficits in the distribution of the medial and lateral plantar nerves.

Nerve conduction studies (NCS) and electromyography (EMG) objectively measure how efficiently the posterior tibial nerve transmits electrical signals. Slowed conduction velocity or prolonged distal latency confirms nerve compression. In-office diagnostic ultrasound allows real-time visualization of the tarsal tunnel to identify cysts, varicosities, or thickened tendons compressing the nerve.

Conservative Treatment Options

Most patients with tarsal tunnel syndrome improve significantly with a structured conservative program before surgical intervention is considered.

Custom foot orthotics: For flatfoot-driven TTS, a custom-molded orthotic that controls pronation and restores normal arch mechanics dramatically reduces traction stress on the posterior tibial nerve. This is the cornerstone of conservative care at our clinic.

Anti-inflammatory management: Oral NSAIDs reduce perineural inflammation. Corticosteroid injections delivered precisely into the tarsal tunnel under ultrasound guidance can decompress the nerve and provide months of relief while other treatments take effect.

Physical therapy and nerve gliding: Targeted exercises mobilize the posterior tibial nerve within its tunnel, reducing adhesions and improving nerve excursion. Strengthening the intrinsic foot muscles and posterior tibial tendon supports the arch and reduces nerve stress.

Activity modification and supportive footwear: Avoiding prolonged standing on hard surfaces, wearing motion-control shoes, and temporarily reducing high-impact activity gives the nerve time to recover.

Surgical Treatment: Tarsal Tunnel Release

When conservative measures fail after 3–6 months, or when a space-occupying lesion is confirmed on imaging, tarsal tunnel release surgery is highly effective. Dr. Biernacki performs this procedure under local or regional anesthesia as an outpatient.

The flexor retinaculum is divided to fully decompress the posterior tibial nerve and its branches. Any cysts, fibrotic adhesions, or varicosities found inside the tunnel are excised simultaneously. Success rates exceed 85% when the underlying cause is clearly identified before surgery and the correct patient is selected.

Recovery involves a period of protected weight-bearing, followed by progressive return to full activity over 6–12 weeks. Post-operative physical therapy accelerates nerve recovery and restores function.

Why Choose Dr. Biernacki for Tarsal Tunnel Syndrome in Michigan?

Dr. Tom Biernacki is a board-certified podiatric physician and surgeon with advanced training in foot and ankle nerve conditions. His diagnostic approach combines clinical expertise with nerve conduction studies and advanced imaging to pinpoint the exact cause of nerve compression — avoiding unnecessary surgery and ensuring each patient gets the most appropriate care. Patients travel from across Southeast Michigan for his precise, results-driven treatment of tarsal tunnel syndrome.

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