Bennett fracture involves fracture through base of which bone?

Bennett fracture involves fracture through base of which bone?

• A. Base of the 2nd metacarpal
• B. Base of the 1st metacarpal (thumb)
• C. Neck of the 5th metacarpal
• D. Head of the 4th metacarpal

Answer: (B)

A Bennett fracture is an intra-articular fracture at the base of the thumb’s metacarpal, where it meets the trapezium at the carpometacarpal joint. The fracture line enters the articular surface, and the rest of the metacarpal is pulled dorsally and ulnarly by muscle forces (notably the abductor pollicis longus), causing partial dislocation of the CMC joint. This pattern is specific to the base of the first metacarpal, unlike fractures at other metacarpal bases or at the neck/head of other metacarpals, such as the neck of the fifth metacarpal or the head of the fourth metacarpal.

A Bennett fracture is an intra-articular fracture at the base of the thumb’s metacarpal, where it meets the trapezium at the carpometacarpal joint. The fracture line enters the articular surface, and the rest of the metacarpal is pulled dorsally and ulnarly by muscle forces (notably the abductor pollicis longus), causing partial dislocation of the CMC joint. This pattern is specific to the base of the first metacarpal, unlike fractures at other metacarpal bases or at the neck/head of other metacarpals, such as the neck of the fifth metacarpal or the head of the fourth metacarpal.