It is generally accepted that integrity of the posterior cruciate ligament plays a major role in knee stability. The potential disability resulting from disruption of the posterior cruciate ligament is sufficient to warrant aggressive operative management when the lesion is discovered. From August 1980 to July 1982, the authors treated the 8 cases of the posterior cruciate ligament injury at the department of orthopedic surgery, Chung Ang university hospital; primary repair(2 cases), reconstruction using the medial head of the gastrocnemius muscle(6 cases). In the operative procedure of reconstruction using gastrocnemius, we experienced the following obstacle and resolved it effectively. l. In the surgical approach, we choosed the separate incision on the anteromedial and posteromedial aspect of knee and satisfactory results were obtained. 2. In adequate length of the gastrocnemius tendon was resolved by releasing of gastrocnemius as closer to it's femoral condyle origin as possible or together with attached periosteum and bone chips, by fixation of gastrocnemius with pull through wire suture method. 3. In advancement of the gastrocnemius into the knee joint, we used No. 32 chest tube and achieved the smooth enterance. 4. Adequate position of the femoral condyle drill hole was achieved by using hip screw reamer and K-wire.