Which of the following is NOT a type of thumb fracture?

The correct answer is that a carpometacarpal fracture is not classified as a specific type of thumb fracture, whereas the other options are recognized terminology for injuries involving the thumb.

To clarify, both Bennett's and Rolando's fractures are specific types of fractures that occur at the base of the first metacarpal bone. A Bennett's fracture is an intra-articular fracture that often involves a fracture-dislocation of the carpometacarpal joint, resulting from axial force being applied to the thumb. Rolando's fracture, on the other hand, is a more complex fracture that also occurs at the base of the thumb and is characterized by a T- or Y-shaped fracture pattern.

A simple fracture is a general term that refers to any fracture without fragmentation or significant displacement. This terminology can apply to any bone in the body, including the thumb. While it is not a specific term dedicated solely to thumb fractures, it can still describe a potential injury involving this digit.

On the other hand, a carpometacarpal fracture is more of an umbrella term that pertains to fractures occurring at the joints where the carpal bones meet the metacarpal bones, not exclusively to thumb injuries. Therefore, it does not fit the same