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Lunate bone Dislocation

*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