A reverse Bennett fracture-dislocation describes a fracture-dislocation of the 5th metacarpal base.

Metacarpal fractures are relatively common, usually the result of an axial force, such as a fall onto the flexed wrist. Amongst the metacarpals, the 5th is the most commonly injured.

Unlike a simple undisplaced fracture of the 5th metacarpal base, a fracture-dislocation indicates that the extensor carpi ulnaris is exerting a significant pull over the metacarpal base and that the fracture is inherently unstable, demanding operative treatment

Because of this, in the presence of a 5th metacarpal fracture, it is of great importance to recognize whether there is a dislocation component or not.