*Most severe of carpal instabilities
*Most commonly associated with a trans-scaphoid fracture
*Involves all the intercarpal joints and disruption of most of the major carpal ligaments
*Produces volar dislocation and forward rotation of lunate
Concave distal surface of lunate comes to face anteriorly
*Capitate drops into space vacated by lunate
*Capitate and all other carpal bones lie posterior to lunate on lateral radiograph
*Triangular appearance of lunate on frontal projection
