Comminuted

Intra-articular

Fracture through base of thumb

Prognosis: worse than Bennett's fracture
(difficult to reduce)

Intra-articular fracture/dislocation of base of 1st metacarpal

Small fragment of 1st metacarpal continues to articulate with trapezium

Lateral retraction of 1st metacarpal shaft by abductor pollicis longus

Intra-articular fracture of the dorsal margin of the distal radius

Extends into radio-carpal joint

Extra-articular fracture of the distal radius

Does not extend into joint space

Dorsal angulation with radial and dorsal displacement of distal fragment

Frequently associated with fracture of ulnar styloid