title: Dorsal dislocations of the second to fifth carpometacarpal joints: a case report.
abstract: Dislocations involving the four ulnar carpometacarpal joints are rare. These complex dislocations are considered to be due to the application of a hyperflexion force on the metacarpal heads. In the present case, an indirect hyperextension force on the metacarpal bones created a lever-arm effect resulting in rupture of the firm ligament complex of the carpometacarpal joints, inducing complete dislocations of the second to fifth carpometacarpal joints.
authors.affiliation: Department of Orthopaedic Surgery, School of Medicine, Keio University, Tokyo, Japan.
authors.forename: Kazuaki
authors.initials: K
authors.lastname: Mito
authors.forename: Toshiyasu
authors.initials: T
authors.lastname: Nakamura
authors.forename: Kazuki
authors.initials: K
authors.lastname: Sato
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Toyama
authors.forename: Hiroyasu
authors.initials: H
authors.lastname: Ikegami
mesh_terms: D000368:Aged; D001864:Bone Wires; D052737:Carpometacarpal Joints / Q000000981:diagnostic imaging / Q000293:injuries*; D005500:Follow-Up Studies; D006801:Humans; D004204:Joint Dislocations / Q000000981:diagnostic imaging / Q000209:etiology* / Q000601:surgery; D008297:Male; D019637:Orthopedic Procedures / Q000379:methods*; D011859:Radiography; D016896:Treatment Outcome