The Bennett fracture is an intraarticular fracture of the base of the first metacarpal. The fracture must involve the first carpometacarpal joint to be called a Bennett fracture. The action of the abductor pollicis longus causes distraction of the fracture fragments. The volar base of the first metacarpal stays with the trapezium.
Oblique radiograph of the hand. There is an intraarticular fracture at the base of the first metacarpal.
PA radiograph of the first digit. This view better defines the Bennett fracture.
