What is a Bennett's fracture?

A Bennett's fracture is characterized as an intraarticular fracture of the first carpometacarpal (CMC) joint, specifically involving the base of the first metacarpal bone, which is the bone that supports the thumb. This type of fracture typically occurs due to axial loading on the thumb when it is in a flexed position, such as during a fall onto an outstretched hand or a direct blow to the thumb.

The significance of this fracture lies in its propensity for joint involvement, meaning that the fracture occurs within the joint space itself, which can lead to potential complications such as arthritis if not treated properly. Treatment options often include immobilization or surgical intervention, depending on the degree of displacement.

Understanding the characteristics of a Bennett's fracture is crucial for proper diagnosis and management, especially in the context of trauma to the hand. The other options describe different types of fractures that do not encompass the specific anatomy and mechanics associated with a Bennett's fracture, thus highlighting the unique nature of this injury.