Fracture of thumb metacarpal base: Type I (Bennett's)
Fracture of thumb metacarpal base: Type I (Bennett's)
Each of these anteroposterior radiographs shows an intra-articular fracture of the thumb metacarpal (arrows). The Type I or "Bennett's" fracture of the proximal first metacarpal illustrated here is characterized by its articular involvement and the persistent attachment of the volar fragment to the trapezium.