The distal ulna is an important component in the forearm and wrist motion. Pronation-supination is a complex movement, combining the rotation of the radius around the ulna with a horizontal and axial translation. If the distal ulna fails to heal in the proper anatomical position maintaining its original length with significant residual angulation at the fracture site, and separation of the DRUJ in a transverse axis, then a more severe limitation of forearm motion
The aim of this current prospective study is to evaluate the effectiveness of an open reduction and internal fixation {ORIF} by distal ulna hooked locking compression plate (lcp) in treatment of isolated displaced distal ulna fracture in adult  without concomitant distal radius fractures.