Bennett's fracture
Background
- Fracture of the base of the 1st metacarpal (thumb) which extends into the CMC joint.
- most common type of fracture of the thumb, and is nearly always accompanied by some degree of subluxation or dislocation of CMC
Clinical Features
Differential Diagnosis
Thumb fracture classification
- Type I (Bennett's fracture)
- Fracture-dislocation of the base of the metacarpal (intra-articular)
- Base fragment is aligned with trapezium, but distal portion is subluxed by abductor pollicis longus
- Most common type of thumb fracture; nearly always accompanied by some subluxation or dislocation of CMC
- Type II (Rolando's fracture)
- Comminuted version of a Bennett's fracture (intra-articular)
- Type III
- Extra-articular (transverse or oblique)
- Type IV
- Extra-articular pediatric fracture involving the proximal physis
