Supracondylar fracture of femur is not well suited to internal fixation. A wide canal, thin cortex, comminution and compound wound make open reduction difficult. And the associated injuries, such as popliteal artery rupture are not infrequent. Some authors reported the favorable results with open reduction and rigid internal fixation. But still we have had failure cases with loosening or breakage of plate and screws, infection, post-operative joint stiffness and non-union etc. The present paper reports the result of surgically treated supracondylar fracture. From March 1982 to February 1989 25 patients who were treaed at Department of Orthopedic Surgery, St. Vincent Hospital were analysed. The results obtained as follows:l. Age distribution was between 29 and 74 years of age, and the ratio between males and females was 1.8:1. The most common of injury was traffic accident. 2. According to Neer's classification, there were 5 patients of type I, 7 patients of type II -A, 6 patients of type II-B, 7 patients of type III. 10 were compound fracture. 3. Twelve patients(48%) had associated injuries in the other parts, and frequent ones were popliteal artery rupture, patella fracture and tibia fracture. 4. According to Schatzker and Lambert's criteria, excellent or good results were achieved in 15 patients, fair in 6, and failure in 4. By Neer's classification, excellent or good results were achieved in all of 5 patients in type I, 7 out of 13 patients of type II, and 3 out of 7 patients of type III. 5. Among 20 patients of Neer type II and III, excellent or good results were achieved in 4 out of 6 patients who were treated with bone shortening, whereas 7 out of 17 patients who were treated without bone shortening. 6. Excellent or good results were achieved in 7 out of 11 patient who treated with blade plate, whereas 3 out of 7 patients who treated with Judet plate. 7. Eleven patients(44%) had complication. Six joint stiffness, 6 osteoarthritis, 5 infection, 4 nonunion and 4 leg length shortening occurred, and 1 below knee amputation due to popliteal artery rupture occurred.