Certified Hand Therapist (CHT) Practice Exam

What is a Bennett's fracture?

1. Fracture at the base of the first metacarpal

2. Comminuted intra-articular fracture of the base of the first metacarpal

3. Fracture of the second metacarpal

4. Fracture dislocation at the distal phalanx

The correct answer is: Fracture at the base of the first metacarpal

A Bennett's fracture is specifically characterized as a fracture at the base of the first metacarpal, which is the bone associated with the thumb. This particular fracture is notable because it typically occurs as a result of axial loading or impact, often seen in sports or activities that involve forceful striking with the fist. The significance of this fracture lies in the fact that it can result in intra-articular involvement, where the fracture line extends into the joint, and may also lead to instability due to the pull of the surrounding ligaments and muscles. Although option B mentions a comminuted intra-articular aspect, which can sometimes occur, Bennett's fracture fundamentally describes the fracture at the base of the first metacarpal without requiring it to be comminuted. The other choices refer to different metacarpal bones or types of fractures, none of which correspond to the classic definition of a Bennett's fracture. Understanding the specific anatomy and the mechanism of injury associated with Bennett's fracture helps in effectively diagnosing and managing this condition in clinical practice.