Medial Ankle Pain: Causes, Diagnosis, and Treatment

Quick answer: Medial Ankle 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.

Related Conditions

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

What Causes Pain on the Inside of the Ankle?

Medial ankle pain — pain on the inner (big-toe side) of the ankle — has several distinct causes with different anatomy, presentations, and treatments. The most important structures on the medial ankle are the posterior tibial tendon (PTT), the deltoid ligament complex, the tibialis posterior tendon sheath, the tarsal tunnel (containing the posterior tibial nerve, flexor hallucis longus, and flexor digitorum longus tendons), and the medial malleolus of the tibia. Accurately identifying which structure is involved is essential because treatment differs substantially depending on the diagnosis.

Posterior Tibial Tendon Dysfunction (PTTD)

The posterior tibial tendon is the primary dynamic support of the medial longitudinal arch. When it degenerates or tears — most commonly in middle-aged women with flatfoot, hyperpronation, or obesity — it causes medial ankle pain just posterior and inferior to the medial malleolus, along the tendon’s course toward its navicular insertion. Classic findings: pain and swelling along the posterior tibial tendon, progressive flatfoot deformity (arch collapse), “too many toes” sign when viewed from behind, and inability to perform a single-leg heel rise. Stage I PTTD involves tendinitis with normal tendon function; Stage II involves significant deformity but flexible hindfoot; Stages III and IV involve rigid deformity and ankle joint involvement.

Treatment depends on staging. Stage I: relative rest, NSAIDs, immobilization in an ankle-foot orthosis (AFO), physical therapy for strengthening. Stage II: AFO or UCBL orthosis for arch support, tendon rehabilitation, and surgical planning if conservative management fails after 3–6 months. Surgical options for Stage II include flexor digitorum longus tendon transfer augmenting the failed PTT, medial calcaneal osteotomy to correct hindfoot valgus, and often a lateral column lengthening. Stages III–IV typically require fusion procedures.

Tarsal Tunnel Syndrome

The tarsal tunnel is a fibro-osseous canal behind and beneath the medial malleolus, through which pass the posterior tibial nerve, posterior tibial artery and vein, flexor digitorum longus tendon, and flexor hallucis longus tendon. Compression of the posterior tibial nerve within this tunnel produces tarsal tunnel syndrome — burning, tingling, and numbness on the plantar foot and into the toes, with a positive Tinel’s sign (tapping over the tarsal tunnel reproduces electric shock sensations into the foot). Causes include space-occupying lesions within the tunnel (ganglion cysts, varicosities, lipoma), post-traumatic scarring, flatfoot deformity stretching the nerve, or systemic conditions such as hypothyroidism causing nerve compression.

Diagnosis is confirmed with electrodiagnostic studies (nerve conduction velocity, EMG). Treatment begins with address of contributing factors: orthotic control of flatfoot reducing nerve tension, anti-inflammatory medication, corticosteroid injection near the nerve, activity modification. Surgical tarsal tunnel release — decompression of the flexor retinaculum and release of any space-occupying lesion — is indicated when conservative management fails after 3–6 months in patients with confirmed electrodiagnostic abnormality.

Deltoid Ligament Injury

The deltoid ligament is a broad, strong triangular ligament connecting the medial malleolus to the talus, calcaneus, and navicular. It is the primary restraint against eversion of the ankle. Isolated deltoid ligament tears are uncommon — they typically occur with eversion ankle sprains, combined with lateral ligament injuries, or in the setting of ankle fractures (where deltoid rupture indicates instability requiring surgical stabilization). Medial ankle swelling and tenderness over the deltoid ligament, reproducing pain with eversion stress, suggest deltoid injury. Medial ankle clear space widening on X-ray (>4 mm) indicates significant deltoid disruption requiring surgical attention.

Isolated grade I–II deltoid sprains without ankle instability are managed conservatively with rest, RICE, ankle brace, and graduated rehabilitation. High-grade deltoid tears associated with instability or syndesmotic injury require surgical repair or reconstruction. Chronic deltoid insufficiency leading to valgus ankle deformity requires osteotomy or reconstruction to prevent progressive joint degeneration.

Frequently Asked Questions

Medical References & Sources

• PubMed Research — Posterior Tibial Tendon Dysfunction Treatment
• PubMed Research — Tarsal Tunnel Syndrome Outcomes
• American Orthopaedic Foot & Ankle Society — Adult Acquired Flatfoot

Dr. Tom Biernacki, DPM is a board-certified podiatric surgeon at Balance Foot & Ankle in Howell and Bloomfield Township, Michigan. He diagnoses and treats medial ankle pain including posterior tibial tendon dysfunction, tarsal tunnel syndrome, and deltoid ligament injuries with comprehensive conservative and surgical care.

In-Office Treatment at Balance Foot & Ankle

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

Related Care at Balance Foot & Ankle

Clinical ankle services at our Howell and Bloomfield Township offices.