Dorsal dislocation of the trapezoid with carpo-metacarpal dislocations: a case report and a description of the "missing carpal sign" on radiographs

Abstract

Background: A case report of dorsal trapezoid dislocation with index and middle carpometacarpal dislocation is described.

Objectives: On review of the literature, this rare injury is often misdiagnosed on presentation, with difficulty in reviewing initial radiographs being a key factor.

Case report: We present our case report of trapezoid dislocation and describe the "missing carpal sign" on radiographs as an aid to suspicion of diagnosis.

Conclusion: Trapezoid dislocation is an often-overlooked diagnosis; we present a sign to increase suspicion of injury and hence promote further investigation.

Keywords: carpal; dislocation; missing; sign; trapezoid.