Fractures of the distal end of the femur are difficult to manage because of the a wide range of potential complications. In the past, there has been a reluctance toward treatment of fractures of the distal end of femur with internal fixation. Recently, however, a trend toward internal fixation has become evident and good results have been reported by several authors. We analyzed 30 cases of distal femur fracture involving knee joint in the Department of Orthopaedic Surgery in National Medical Center from Jan. 1982 to Dec. 1986. 1. There were 30 cases in 29 patients. And were devided in 23 closed and 7 open fractures. 2. Clinical union were taken from 3 to 5 months in conservative and 2 to 3.5 months in operative treatment. 3. Satisfactory results were 5 cases(64%) in conservstive and 16 cases(73%) in operative treatment. 4. Significant complication were stiffness and infection.