[Fibrous hyperplasia of the flexor tendon sheaths as a main cause of carpal tunnel syndrome].

The diagnosis of a carpal tunnel syndrome constitutes a frequent indication for surgery. The need for the operation should be underscored by a neurological investigation with measurement of distal motor latency and the sensory conduction rate in the median nerve. According to an evaluation of 3,816 cases treated surgically, the main cause of the carpal tunnel syndrome is a histologically demonstrated fibrous hyperplasia of the flexor tendon sheaths.