This condition is a fracture, or break, of one or more of the metacarpal bones of the hand. The fracture may be nondisplaced, in which the bones remain aligned, or displaced, in which the fractured ends shift out of alignment. Without proper treatment, the bones may not heal correctly. This can result in improper alignment of the fingers, leading to poor hand function.
This type of injury is most often caused by direct trauma to the hand, such as punching another object, a sharp blow to the hand, a fall, or a twisting or crushing injury can all cause a metacarpal hand fracture. If the break occurs at the end of the bone nearest the knuckle, this is called a boxer’s fracture.