Triggering of the thumb with de Quervain's stenosing tendovaginitis.

Triggering with de Quervain's stenosing tenosynovitis has rarely been mentioned since de Quervain's original description. Either or both the abductor pollicis longus and extensor pollicis brevis tendons may be responsible. Without detailed examination testing specifically for triggering, the entity may be overlooked. We have encountered nine patients with triggering in the first dorsal compartment. The five with surgical release had complete resolution of symptoms; the four treated nonoperatively have improved but still have symptoms. Triggering may represent a more severe form of de Quervain's tendovaginitis.