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Carpal bone dislocations: review of 20 cases.

Twenty cases of carpal bone dislocation were encountered during a 7-year period, with an average of 27 months of follow-up. There were 10 types of dislocation in this series, the most common type was transscaphoid perilunate dislocation seen in 9 cases. In addition, there were 2 scaphoid subluxations, 1 volar lunate dislocation, 1 dorsal perilunate dislocation, 1 scaphoid perilunate dislocation, 1 hamate and pisiform dislocation, 1 transhamate pisiform dislocation, 1 trapezoid and 2-5 carpometacarpal joint dislocation, 1 trapezium, trapezoid and 2-4 carpometacarpal joint dislocation, and 2 trapezium periscapholunate dislocations. Methods of treatment included open reduction, closed reduction, proximal row carpectomy, total wrist arthrodesis, and excision of the lunate. In this series, the patterns of dislocation were different for crushing injuries and dorsiflexion injuries. The clinical results associated with the soft tissue injuries of the ipsilateral hand were mostly caused by crushing forces. Although carpal instabilities were noted, there was no significant correlation between the clinical and radiographic results in some of our cases. Best results invariably relied on a stable anatomic reduction and an adequate period of immobilization. Poor results were demonstrated in those cases with incomplete initial reduction, secondary degenerative arthrosis, or nonunion.

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