| Classification | Description | Notes |
| Bennett Fracture | Intra-articular fracture, ulnar base of thumb metacarpal | Traction of the abductor pollicis longus on the major fragment prevents healing without ORIF |
| Rolando Fracture | Comminuted intra-articular fracture, base of thumb metacarpal | More difficult reduction than Bennett |
References:
Wieschhoff GG, Sheehan SE, Wortman JR, Dyer GS, Sodickson AD, Patel KI, et al. Traumatic Finger Injuries: What the Orthopedic Surgeon Wants to Know. Radiographics. 2016;36(4):1106-28.