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<unk> ; 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
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<unk> ; nearly always accompanied by some subluxation or dislocation of CMC
Comminuted version of a Bennett's fracture (intra-articular)
Extra-articular (transverse or oblique)
Extra-articular pediatric fracture involving the proximal physis
Thumb fracture
Non-thumb metacarpal fractures
Tibial spine fracture 
Head
Tibia fracture 
Neck
Trapezium fracture
Shaft