257 patients, 301 knees with flexion contractures of the knee due to residual poliomyelitis, treated with dista1 femoral osteotomy at the Wilson Leprosy Center and Rehabilitation Hospital from 1984 to 1988 were analyzed. Surgical method was anterior closed wedge incomplete osteotomy, two weeks after opertion which was closed by manipulation of the cast. The results were summarized as follows: l. Excetp 9 cases out of 301 knees, full knee extension was obtained. 2. More range of motion was resulted.(preop. 102 degrees to postop 128 degrees) 3. Hand on thigh posture was eliminated in 83% of the preop. hand on thigh paitents. 4. Full further flexion was obtained in 95% when the preoperative flexion contracture was 10 degrees, 81% when 20 degrees, 65% when 30 degrees, 33% when 40 degrees, 15% when 50 degrees and non of them when more than 60 degrees. 5. Three main complications were recurrence, stiffness, and postop. genu varum deformity, and the complications were 13% of all cases. 6. Our method, closed wedge incomplete distal femoral osteotomy without internal fixation, is a simple and effective method of correcting knee flexion contracture in residual poliomyelitis.