De Quervain's disease.
This is a tenosynovitis of the abductor pollicis longus and extensor pollicis brevis tendons contained within the osseofibrous tunnel of the distal radius. Multiple tendons for the abductor pollicis longus and a separate, severely narrowed sheath for the extensor pollicis brevis make nonsurgical treatment difficult at times. While avoiding damage to nerve branches, surgical treatment is aimed at release of both tendon sheaths.
D006801:Humans; D013717:Tenosynovitis / Q000175:diagnosis / Q000601:surgery / Q000628:therapy*; D013933:Thumb / Q000601:surgery