Complex fractures of the proximal ulna: the critical importance of the coronoid fragment.

Complex fractures of the proximal ulna with associated elbow instability represent challenging disorders with a high incidence of complications, including malunion, arthrosis, stiffness, and recurrent instability. If a significant coronoid fragment is present, there is an increased risk of a poor outcome. Proper management of this coronoid fragment can be critical to a successful outcome. Information on identifying, reducing, and fixing the coronoid fragment in complex proximal ulnar fractures will help the treating orthopaedic surgeon maximize results with this difficult injury pattern.