The Boxer’s Knuckle The boxer lands the punch and feels a sharp pain across the back of the knuckle. It is not a clean fracture pain and it is not the dull ache of a bruised hand. It is worse than that — a snapping, unstable feeling over the metacarpophalangeal joint, sometimes followed by swelling, loss of extension, or a sense that the finger is not tracking straight when the fist opens and closes. Fighters often ignore it because they can still make a fist and still hit pads. That is exactly how a preventable hand injury becomes a long-term problem.Boxer’s knuckle is not a cosmetic knuckle bruise. It is…