intra-articular fracture-dislocation of the base of the first metacarpal (Bennett Fracture). .

Bennett Fracture

• An intra-articular fracture-dislocation of the base of the first metacarpal .
• The most common mechanism of fracture is axial loading of the first metacarpal (i.e., during a fist fight).
• Dorsal subluxation is the most common dislocation.

The fracture has been labelled on the first set of images. 

 The next set of images were taken while the hand was in a cast.