Fracture of the capitellum is intraarticular fractures that occured rarely about the elbow. It is usually caused by a fall on the outstretched upper extremity with the radial head impacting against the anterior portion of the lateral humeral condyle. We reviewed 4 patients with capitellum fracture of the humerus treated by open reduction and internal fixation from Aug. 1990 to Mar 1993. The isolated capitellum fractures were in 2 cases, associated radial head fracture in 1 rase, associated humeral lateral condyle fracture in 1 case. The case combined comminuted fracture of the humeral lateral condyle was fair, others were good result.