Scapholunate advanced collapse (SLAC) and dorsal intercalated segmental instability (DISI)
Pain and functional limitation in trauma outcomes.
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MRI right wrist
Scapholunate ligament tear with scaphoid rotational subluxation and lunate displacement in DISI position; early proximal capitate dislocation between the scaphoid and the distal radial shaft with signs of carpal arthritis (scapholunate advanced collapse). Normal triangular fibrocartilage. Small amount of joint effusion.
Scapholunate dissociation refers to the interruption of the mechanical connection between the scaphoid and lunate. Scapholunate is the most common carpal instability and can be isolated or in association with scaphoid fractures. The rotational subluxation of the scaphoid represents an advanced stage of the lesion.