Scapholunate advanced collapse (SLAC)


SLAC (scapholunate advanced collapse) refers to a specific pattern of degenerative arthritits 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.