Displaced ulnar shaft fractures are frequently associated with radiohumeral dislocation, producing the Monteggia fracture-dislocation. Fractures not previously thought to coexist were seen in a young boy following a severe automobile-pedestrian accident. The displaced ulnar shaft fracture was associated with a displaced lateral condylar fracture with preservation of the radiocapitellar joint and capsule. This fracture was treated with rigid internal fixation in spite of the open nature of the ulnar shaft fracture. This treatment permitted early range of motion of the elbow with early use of ambulatory aids for other associated injuries and an excellent follow-up at 13 months with a normal range of motion of the elbow.