tarsal
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Tarsal Tunnel Syndrome
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.In this disorder, compression of the posterior tibial nerve at the ankle results in severe pain leading to disability and reduced ambulation. Presenting symptoms include burning and discomfort, which may be severe and usually radiate to the toes. Pain increases upon ambulation and is relieved by rest. The condition may be diagnosed by Tinel's sign, distal tingling produced by tapping on the nerve at the site of compression.

It is important to reestablish proper biomechanics in ambulation to reduce excessive pressure on the nerve.  This is the primary role of a custom orthotic.