[Acute carpal tunnel syndrome and tendon rupture of the long flexor muscle of the thumb as a rare complication of a scaphoid pseudoarthrosis. Case report].

The authors demonstrate a case of a scaphoid pseudarthrosis leading to an attrition rupture of the flexor pollicis longus tendon, tenosynovitis and haemorrhage into the carpal tunnel causing recurrent symptoms of an acute carpal tunnel syndrome. Every acute carpal tunnel syndrome is an emergency requiring instant decompression of the carpal tunnel. If success with conservative treatment of acute carpal tunnel syndrome is questionable, early operative relief of the median nerve is the safest procedure.