SLAC (scapholunate advanced collapse) refers to a specific pattern of degenerative arthritis and subluxation which results from untreated chronic scapholunate dissociation.
Watson staging is often used by hand surgeons:
-
I: osteoarthritis of the articulation between the radial styloid and the scaphoid
-
II: osteoarthritis involving the whole radioscaphoid articulation
-
III: osteoarthritis of the radioscaphoid and capitolunate articulations
-
IV: osteoarthritis of the radiocarpal and intercarpal articulations +/- distal radioulnar joint (DRUJ)
In this case, it is a stage III SLAC wrist.