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Tarsal Tunnel Syndrome
Tarsal tunnel syndrome (posterior tibial neuralgia) is pain in the ankle, foot, and sometimes toes caused by compression of or damage to the nerve supplying the heel and sole (posterior tibial nerve).
The posterior tibial nerve runs down the back of the calf, through a fibrous canal (tarsal tunnel) near the heel, and into the sole of the foot. When tissues around the tarsal tunnel become inflamed, they can swell and press on the nerve, causing pain. Disorders that can cause or contribute to tarsal tunnel syndrome include fracture, ankle swelling caused by heart or kidney failure, and an underactive thyroid gland (hypothyroidism). Also, disorders such as gout or rheumatoid arthritis cause inflammation in the joints. Poor foot posture may also contribute if the ankle rolls too far inward and stresses the nerve within the tarsal tunnel.
Pain, the most common symptom of tarsal tunnel syndrome, usually has a burning or tingling quality that may occur when a person stands, walks, or wears a particular type of shoe. Pain located around the ankle (usually on the inner side) and extending to the toes usually worsens during walking and is relieved by rest. Occasionally, pain also occurs during rest.
To diagnose this condition, a doctor manipulates the affected foot during a physical examination. For example, tapping the injured or compressed area just below the ankle bone often causes tingling (referred to as the Tinel sign), which may extend to the heel, arch, or toes. Nerve conduction studies (see Tests for Brain, Spinal Cord, and Nerve Disorders : Electromyography and Nerve Conduction Studies) may be useful to determine the cause or extent of the injury, especially if foot surgery is being considered.
Injections of a corticosteroid/anesthetic mixture into the area may relieve pain. Other treatments include wrapping the foot and placing specially constructed devices placed in the shoe (orthoses). When other treatments do not relieve the pain, surgery to relieve pressure on the nerve may be necessary.
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