Tarsal tunnel syndrome
A rare disorder arising from abnormal pressure on the tibial nerve in the foot. Where this nerve curves around the inside of the ankle, it passes through the tarsal tunnel, a space formed between the bones of the ankle joint and bands of supporting fibrous tissue. If this space becomes constricted, the nerve is trapped and compressed.
Tarsal tunnel syndrome occasionally occurs when stress, or injury from over activity, damages foot structures. It is also more widespread in people with flat feet. The usual symptoms are pain and a tingling or burning sensation on the sole of the foot.
Antinflammatory drugs and rest can be all that is needed. Persistent cases can be treated by injections of corticosteroid drugs, physiotherapy, or possibly, surgery to open up the tarsal tunnel.