Dorsal intercalated segment instability (DISI) is a deformity of the wrist where the lunate bone angulates to the dorsal side of the hand.
Causes The main cause of DISI is wrist trauma, with or without a fracture: Scaphoid fracture: bony DISI Distal radius fracture: compensatory DISI Malunion of radius fracture: adaptive DISI Scapholunate ligament instability: ligamentous DISI
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