Tarsal Tunnel Release Surgery: Tibial Nerve Decompression for Tarsal Tunnel Syndrome

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When Conservative Treatment for Tarsal Tunnel Syndrome Is Not Enough

Tarsal tunnel syndrome — entrapment of the tibial nerve and its branches within the tarsal tunnel behind the medial malleolus — causes burning, tingling, and numbness along the plantar foot and toes that significantly limits daily activity. While many patients with tarsal tunnel syndrome respond to conservative management including custom orthotics, corticosteroid injection, and activity modification, a subset of patients with structural compression, significant nerve conduction abnormalities, or symptoms refractory to conservative care require surgical decompression. At Balance Foot & Ankle, our Michigan foot surgeons perform tarsal tunnel release for appropriately selected patients throughout Southeast Michigan.

Understanding the Tarsal Tunnel

The tarsal tunnel is a fibro-osseous canal located posterior and inferior to the medial malleolus, bounded by the medial malleolus and bones of the hindfoot on one side and the flexor retinaculum (laciniate ligament) on the other. The tibial nerve and its branches — the medial plantar nerve, lateral plantar nerve, and medial calcaneal nerve — pass through this tunnel along with the posterior tibial tendon, flexor digitorum longus tendon, and posterior tibial artery. Any structure that reduces the available tunnel volume can compress the tibial nerve: a varicose vein, lipoma, ganglion cyst, accessory muscle, tarsal coalition, or posttraumatic scarring from prior ankle fracture or sprain.

Surgical Indications

Tarsal tunnel release is indicated when symptoms are confirmed by nerve conduction velocity studies showing slowed conduction or reduced amplitude of the medial and lateral plantar nerves, when a space-occupying lesion within the tunnel is identified on MRI, and when conservative management including orthotics, bracing, and corticosteroid injection has been inadequate. Patients with identifiable structural causes of tarsal tunnel compression — varicose veins, cysts, lipomas, accessory muscles — have the best surgical outcomes because removing the compressive structure directly decompresses the nerve.

The Surgical Procedure

Tarsal tunnel release is performed through an incision posterior to the medial malleolus, extending from the distal calf to the plantar heel in a gentle curve. The flexor retinaculum — the primary constrictive roof of the tarsal tunnel — is released under direct visualization with careful protection of the nerve branches it overlies. The tunnel is inspected for space-occupying lesions (cysts, varicosities, fibrosis, or accessory muscles) that are excised when found. The medial plantar and lateral plantar nerve branches are followed distally and any secondary entrapment points at the abductor hallucis muscle fascia are released. The medial calcaneal nerve branch is identified and decompressed if it contributes to heel symptoms.

Recovery After Tarsal Tunnel Release

Protected weight bearing in a CAM boot for 2 to 4 weeks is typical following tarsal tunnel release. Physical therapy focusing on ankle mobilization and scar management begins at 2 to 4 weeks. Nerve recovery follows a gradual timeline — patients may notice burning or tingling as the nerve recovers, which is a positive sign of neural regeneration. Meaningful symptom improvement typically occurs at 3 to 6 months, with maximum improvement at 12 months. Outcomes are significantly better when surgery is performed before severe or prolonged nerve compression has caused irreversible neural damage.

If you have burning, tingling, or numbness on the bottom of the foot that has not responded to conservative treatment, contact Balance Foot & Ankle for evaluation. We serve Southeast Michigan with same-week appointments.

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Frequently Asked Questions

How successful is tarsal tunnel release surgery?

Success rates range from 70-85%, with higher success when a clear compression is identified preoperatively. Early intervention produces better results than delayed surgery.

How long does it take to recover from tarsal tunnel release?

Most patients are protected weight-bearing for 2-4 weeks, return to regular shoes around 6 weeks, and experience gradual symptom improvement over 3-6 months.

Will tarsal tunnel surgery fix my numbness?

Numbness often improves gradually as the nerve recovers. Full sensation return can take 6-12 months, and some patients have residual numbness depending on how long the nerve was compressed.

Your Board-Certified Podiatrists

Dr. Tom Biernacki, DPM

Board-Certified · FACFAS

Dr. Carl Jay, DPM

Board-Certified Podiatrist

Dr. Daria Gutkin, DPM

Podiatrist

Dr. Tom Biernacki, DPM

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.