[Carpal tunnel syndrome in developing pseudarthrosis following isolated fracture of os capitatum].

A rare case of well adapted and radiologically invisible capitatum fracture is reported resulting in a pseudarthrosis with pain and median nerve irritation 2 1/2 years following trauma. The difficulty in diagnosis of such well adapted rare fractures is pointed out and electromyography is demonstrated as a good method to diagnose a carpal-tunnel syndrome in cases of pseudarthrosis.