Ulnar fractures frequently occur in motorcycle crashes.
The ulna is a thin bone located on the little finger side of the forearm. It acts as a bone that helps supination and pronation (twisting) of the forearm. Technically, a fracture can occur at any point along the bone but it is mostly fractured along with the radius after a fall on the outstretched hand. It can also be fractures along its length when it is struck by an object directly.