Presentation
Fall from standing height onto the thumb.
Patient Data
Age: 40 years
Gender: Female
From the case:
First carpometacarpal dislocation
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Hand radiographs revealed a first (thumb) carpometacarpal joint dislocation. The thumb is volar and radially dislocated. No fractures are seen.
Case Discussion
Pure first/thumb carpometacarpal joint dislocations are very rare injuries, in contrast with the much more common Bennett fracture, in which there is an associated fracture of the thumb metacarpal base.
These dislocations are usually the result of axial loading with flexion of the thumb metacarpal.
Optimal management of such injuries is still a subject of debate.
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