Scaphoid (navicular) fractures

[Michiko]

Scaphoid fractures usually result from wrist hyperextension. They may not be visible on initial x-rays. Complications can be severe.
(See also Overview of Fractures.)
The scaphoid is the most commonly injured carpal bone. Scaphoid fractures usually result from wrist hyperextension, typically during a fall on an outstretched hand. They can disrupt the blood supply to the proximal scaphoid. Osteonecrosis is thus a common complication, even when initial care is optimal, and can cause disabling, degenerative arthritis of the wrist.