Idiopathic avascular necrosis of the scaphoid. Case report.

Avascular necrosis may affect a number of different bones. In the wrist necrosis of the lunate (Kienböck's disease) is a well known entity. A rarely seen but analogous condition may, however, also affect the scaphoid (Preiser's disease). The mechanism producing ischemia is unknown, although in most cases the initiating event is mostly likely loss of blood supply by a mechanical insult. Two cases of idiopathic avascular necrosis of the scaphoid are reported, manifested by insidious wrist pain and progressing roentgenologic changes. Despite early diagnosis and prolonged immobilization irreversible collapse of the affected bone could not be prevented.