Isolated distal ulna fracture are usually the result of direct force to the ulna, as was the mechanism in this case.
Displaced or comminuted distal ulna neck fractures (those that occur within 5cm of the head) can disrupt the distal radioulnar joint and may cause pain or dysfunction at this joint in the future if not adequately treated 1.
Stable fractures can be treated with immobilization with an above elbow cast. Distal ulna neck/shaft fractures that concurrently occur with a distal radius fracture should be assessed after the radius fracture has been definitely treated. ORIF may be necessary in those distal ulna fractures that cannot be adequately reduced or appear unstable 1.
This patient went on to have plate and screw internal fixation.