Bennett fracture is an oblique fracture of which bone near the carpometacarpal joint?

• A. Radius
• B. Scaphoid
• C. First metacarpal
• D. Fifth metacarpal

Answer: (C)

This question tests recognizing the exact location of a Bennett fracture. It is an oblique intra-articular fracture at the base of the thumb’s first metacarpal right at the carpometacarpal joint. That base fracture is what drives the fracture-dislocation pattern: part of the fragment remains connected to the trapezium, while the rest of the metacarpal is displaced by muscular and ligamentous forces, producing instability at the CMC joint. Because the injury is at the base of the first metacarpal near the CMC joint, this specific location distinguishes Bennett fractures from other hand injuries.

The other bones listed aren’t correct because they involve different joints and fracture patterns: radius fractures occur in the forearm, scaphoid fractures involve a carpal bone, and a fracture of the fifth metacarpal typically happens at the neck (often called a boxer's fracture) and does not involve the base of the first metacarpal near the CMC joint.