The patient present with a localized bump on the dorsum of the wrist. This is bony hard and located over the base of the 2 or 3 metacarpals. it may be confused with a ganglion.
This is due to premature degeneration of the 2 and/or third carpometacarpal joint. A special x-ray is taken. The wrist is acutely flexed and a tangential lateral view will show the new bone in profile.
Failure of non-operative treatment will require surgery .The new bone is shaved off from under the wrist extensor tendons.