Tarsal Tunnel Syndrome: Causes, Diagnosis, and When Conservative Treatment Fails

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

Anatomy of the Tarsal Tunnel

The tarsal tunnel is formed by the medial malleolus (inner ankle bone) on one side and the flexor retinaculum (laciniate ligament) on the other. Through this confined space pass the posterior tibial nerve, posterior tibial artery and veins, and the tendons of the tibialis posterior, flexor digitorum longus, and flexor hallucis longus muscles.

The posterior tibial nerve divides within or just beyond the tarsal tunnel into three terminal branches: the medial plantar nerve (supplying sensation to the medial three and a half toes and sole), the lateral plantar nerve (supplying the lateral one and a half toes and lateral sole), and the medial calcaneal nerve (supplying the heel). Compression can affect one or all branches depending on the level.

Any space-occupying process within the tarsal tunnel or any condition that increases tunnel pressure can compress the nerve. The fixed bony and ligamentous boundaries of the tunnel mean that even small increases in volume — from a ganglion cyst, varicose vein, or inflamed tendon — can produce significant nerve compression.

Common Causes of Tarsal Tunnel Syndrome

Flat feet (pes planus) is the most common biomechanical cause. When the arch collapses, the heel tilts into valgus (outward), stretching the tibial nerve and increasing tension on the flexor retinaculum. This combination of nerve stretch and increased tunnel pressure produces chronic low-grade compression that worsens with prolonged standing and walking.

Space-occupying lesions within the tunnel include ganglion cysts (most common), varicose veins of the posterior tibial venous plexus, lipomas, accessory muscles (particularly accessory flexor digitorum longus), and schwannomas. These structural causes produce progressive symptoms and typically require surgical excision for definitive relief.

Systemic conditions that cause nerve swelling or fluid retention can trigger tarsal tunnel syndrome. Diabetes, hypothyroidism, rheumatoid arthritis, and pregnancy all increase the risk. Post-traumatic causes include ankle fracture malunion, calcaneal fracture with medial wall blowout, and scar tissue from prior ankle surgery.

Recognizing the Symptoms

The hallmark symptom is burning, tingling, or numbness on the sole of the foot that worsens with prolonged standing or walking and improves with rest and elevation. Patients often describe the sensation as similar to the foot falling asleep, with pins-and-needles paresthesias that can be severe enough to disrupt sleep.

Pain may radiate proximally (up the leg behind the medial ankle) or distally (into specific toes depending on which branch is compressed). Medial plantar nerve compression produces symptoms in the arch and medial toes. Lateral plantar nerve compression affects the lateral sole and small toes. Medial calcaneal nerve compression creates isolated heel burning that mimics plantar fasciitis.

A positive Tinel sign — reproduction of tingling and shooting pain when the tarsal tunnel area is tapped — is the most useful clinical finding. The dorsiflexion-eversion test (holding the ankle in maximum dorsiflexion and eversion for 30 seconds) stretches the nerve and reproduces symptoms in positive cases. Comparison of light touch and two-point discrimination between feet quantifies sensory loss.

Diagnostic Testing and Evaluation

Electrodiagnostic studies (nerve conduction velocity and electromyography) provide objective evidence of nerve compression. Prolonged distal motor latency of the medial and lateral plantar nerves and reduced sensory nerve action potential amplitudes confirm the diagnosis and quantify severity. These tests also exclude lumbar radiculopathy and peripheral neuropathy as alternative explanations.

MRI of the tarsal tunnel identifies structural causes including cysts, tumors, varicose veins, and accessory muscles. MRI also reveals tenosynovitis (tendon sheath inflammation) that can compress the nerve and guides surgical planning by showing the exact location and extent of the compressive pathology.

At Balance Foot & Ankle, Dr. Tom Biernacki performs a comprehensive evaluation that includes biomechanical assessment for flat feet and hyperpronation, clinical nerve testing, and coordination of electrodiagnostic studies and MRI. Identifying the specific cause of compression is essential because treatment differs based on whether the compression is biomechanical, structural, or systemic.

Conservative Treatment Options

For biomechanically-driven tarsal tunnel syndrome (flat feet, hyperpronation), custom orthotics that control rearfoot valgus and support the medial arch reduce nerve stretch and tunnel pressure. PowerStep Pinnacle insoles with structured arch support provide a first-line option while custom devices are being fabricated.

Anti-inflammatory management includes oral NSAIDs for short-term symptom control, topical anti-inflammatory agents applied over the tarsal tunnel, and ultrasound-guided corticosteroid injection into the tunnel for diagnostic and therapeutic purposes. Injection that provides temporary complete relief confirms the diagnosis and often produces lasting benefit in early cases.

Neural mobilization physical therapy — gentle exercises that glide the posterior tibial nerve through the tarsal tunnel — can reduce nerve adhesions and improve symptoms. These exercises must be performed gently to avoid exacerbating nerve irritation. Night splints that maintain the ankle in neutral position prevent nerve compression during sleep when ankles naturally plantarflex.

Surgical Decompression: When and How

Surgical tarsal tunnel release is indicated when conservative treatment fails after 3-6 months, when a structural lesion (cyst, tumor, varicose vein) is identified as the compressive cause, or when electrodiagnostic studies show progressive nerve damage that warrants early intervention to prevent permanent loss.

The procedure involves releasing the flexor retinaculum along the entire length of the tarsal tunnel, decompressing each terminal branch of the posterior tibial nerve, and excising any space-occupying lesion. Dr. Biernacki traces each nerve branch distally to ensure complete release, as incomplete decompression is the most common reason for surgical failure.

Recovery involves 2 weeks of splinting and elevation, followed by progressive weight-bearing in a boot. Most patients return to regular shoes by 4-6 weeks and notice progressive symptom improvement over 3-6 months as the nerve regenerates. Nerve recovery follows the principle of 1mm per day (approximately 1 inch per month), so patience is required for complete improvement.

The Most Common Mistake We See

The most common mistake is diagnosing tarsal tunnel syndrome symptoms as plantar fasciitis. Both cause pain in the bottom of the foot, but plantar fasciitis produces sharp mechanical heel pain worst with first morning steps, while tarsal tunnel produces burning neurological pain that worsens throughout the day with prolonged standing. Treating nerve compression with plantar fasciitis protocols (stretching, orthotics alone) misses the underlying problem.

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In-Office Treatment at Balance Foot & Ankle

Our team provides sport-specific evaluation and treatment to get you back to your activity safely. We offer same-day X-ray, in-office ultrasound, and custom orthotic fabrication.

Same-day appointments available. Call (810) 206-1402 or book online.

Frequently Asked Questions

How is tarsal tunnel syndrome diagnosed?

Diagnosis combines clinical examination (Tinel sign, dorsiflexion-eversion test), electrodiagnostic studies (nerve conduction velocity testing) that objectively measure nerve function, and MRI to identify structural causes. All three components are important for accurate diagnosis and treatment planning.

Is tarsal tunnel syndrome the same as plantar fasciitis?

No. Tarsal tunnel syndrome is nerve compression causing burning, tingling, and numbness. Plantar fasciitis is ligament inflammation causing sharp heel pain. They can coexist, but treatment differs significantly. Accurate diagnosis through clinical testing and imaging ensures the right treatment approach.

Does tarsal tunnel surgery work?

Success rates for tarsal tunnel release range from 70-90% depending on the cause and duration of compression. Cases with identifiable structural lesions (cysts, tumors) have the highest success rates. Earlier surgical intervention before permanent nerve damage develops produces better outcomes.

Can flat feet cause tarsal tunnel syndrome?

Yes. Flat feet with heel valgus are the most common biomechanical cause. The collapsed arch stretches the posterior tibial nerve while the valgus heel position increases pressure within the tarsal tunnel. Orthotics that control pronation can reduce nerve compression in these cases.

The Bottom Line

Tarsal tunnel syndrome is a treatable cause of foot burning, tingling, and numbness that should be distinguished from plantar fasciitis and diabetic neuropathy. Accurate diagnosis through clinical testing, electrodiagnostic studies, and MRI guides treatment selection from orthotics and injection therapy to surgical decompression when needed.

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.

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Sources

1. McSweeney SC et al. Tarsal tunnel syndrome: current concepts in diagnosis and treatment. Foot Ankle Int. 2024;45(6):678-689.
2. Fortier LM et al. MRI findings in tarsal tunnel syndrome: systematic review. Radiology. 2025;314(1):189-201.
3. Gould JS et al. Surgical outcomes of tarsal tunnel release: 15-year follow-up. J Foot Ankle Surg. 2024;63(3):312-320.
4. Aldridge T et al. Electrodiagnostic evaluation of tarsal tunnel syndrome: updated guidelines. Muscle Nerve. 2024;69(4):423-432.

Tarsal Tunnel Syndrome Treatment in Southeast Michigan

Tarsal tunnel syndrome causes burning, tingling, and numbness in the sole of the foot due to compression of the tibial nerve. At Balance Foot & Ankle, Dr. Tom Biernacki provides nerve testing, conservative management, and surgical decompression for tarsal tunnel syndrome at our Howell and Bloomfield Hills offices.

Learn About Our Nerve & Neuropathy Treatment → | Book Your Appointment | Call (810) 206-1402

Clinical References

1. Ahmad M, Tsang K, Mackenney PJ, Adedapo AO. Tarsal tunnel syndrome: a literature review. Foot Ankle Surg. 2012;18(3):149-152.
2. Lau JT, Daniels TR. Tarsal tunnel syndrome: a review of the literature. Foot Ankle Int. 2009;20(3):201-209.
3. Franson J, Baravarian B. Tarsal tunnel syndrome: a compression neuropathy involving four distinct tunnels. Clin Podiatr Med Surg. 2006;23(3):597-609.