Template:Thumb fracture classification

Type I (Bennett's fracture)
- Fracture-dislocation of the base of the metacarpal (intraarticular)
- 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 (intraarticular)
Type III
- Extraarticular (transverse or oblique)
Type IV
- Extraarticular pediatric fracture involving the proximal physis