Reverse Bennett's fracture dislocation
Trauma to the hand. Pain, swelling and slight deformity.
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Oblique fracture of the base of the 5th metacarpal bone with 2mm radial displacement of the fractured fragment and proximal displacement of the metacarpal bone by 3mm. The 5th CMC joint is also involved and results in a 3mm step. Soft tissue swelling adjacent to the fracture site is also noted.
The intra-articular fracture dislocation of the base of the 5th metacarpal bone is called reverse Bennett's fracture and is analogous to Bennett's fracture of the thumb. Vigorous and unopposed pull from the extensor carpi ulnaris causes proximal migration and subluxation of the fracture fragment; these fractures are quite unstable.