Pressure on peripheral nerves can cause numbness, weakness or pain -- compression neuropathy -- in the areas the nerves supply. Pressure on the median nerve at the wrist (i.e., carpal tunnel syndrome) is the most common compression neuropathy of the upper extremity but compression of the ulnar, radial, posterior interosseous and anterior interosseous nerves is also seen. Among these, compression of the ulnar nerve in the cubital tunnel at the elbow is the more common. The diagnosis of compression neuropathy is made by clinical correlation of the patient’s complaints with the anatomic distribution of the nerve, and may be confirmed by electro-diagnostic studies.
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