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The increased motion at the two smaller fingers allows for more angulation to be acceptable as the fracture heals. In an athlete’s normal uninjured hand, there is less motion at the joints of the index and long finger and more motion at the ring and small fingers. A higher force injury can lead to more bending (displacement of the fracture). How much the fracture bends is somewhat dependant on how much force caused the injury in the first place. When a metacarpal fracture happens, the finger flexors and the intrinsic muscles act together to bend the fracture toward the palm (apex dorsal angulation). In between the metacarpal bones are the small intrinsic muscles (the interosseous and lumbrical muscles) that further help to control fine finger motion. There are extensor tendons on the back of the hand that act to extend or straighten the fingers. There are flexor tendons on the palm side of the metacarpals that act to flex, or bend the fingers as in making a fist. Each of the fingers (digits) has a corresponding metacarpal that links the wrist bones to the phalanges (individual bones of the fingers). The metacarpals are the tubular bones that comprise most of the space in the palm. For example Ronnie Brown of the Miami Dolphins and Tony Romo of the Dallas Cowboys each spent time on the IR from suffering a metacarpal fracture as did the Mavericks Jason Terry who had surgery to fix his metacarpal fracture. These injuries are also common in other sports besides boxing.