Abstract
The recognition of carpal instability as a clinical entity is relatively recent. The relationship between perilunate dislocation and dorsif lexed intercalated segment instability (DISI) of the wrist has not been clearly established.
A roentgenographic analysis was carried out on the wrists of 17 patients, 14 with perilunate dislocations with fractures of the scaphoid and other bones, and three with perilunate dislocations without fractures, treated by closed reduction or open reduction.
After injury, 12 of the 17 patients had open reduction of their dislocations and the other 5 had closed reduction. From these studies it was concluded that 1) the cases of perilunate dislocation with non-union of the scaphoid and the old cases of perilunate dislocation with or without scaphoid fracture tended to show DISI deformity, and that 2) the fresh cases of perilunate dislocation treated with closed reduction showed normal alignment of the carpus.
