A boxer’s fracture is a fracture of the fifth metacarpal bone of the hand, at the metacarpal neck. This is the bone associated with the small finger. When fractured, usually after punching an object like a boxer, it is often displaced and requires surgery.
Never ever punch a wall or hard object, because unlike in the movies or television there is a very high likelihood you will sustain a fracture in the hand.
Furthermore, if you are training in martial arts, or UFC, or a boxer, make sure you follow the appropriate precautions to prevent an incorrect punch and ultimate fracture of the 5th finger.
Always seek the care of an orthopedic hand surgeon immediately as a delay in care may lead to a suboptimal outcome.