It is generally accepted that the integrity of posterior cruciate ligament plays a major role in knee stability. The rotatory movement is around a point to the back of center of joint where the posterior cruciate ligament lies, and it is a structure which is just as important as the other ligaments. Methods of reconstruction have been described, using semitendinosus tendon, gracilis tendon, popliteus tendon, patellar tendon, iliotibial band, and medial meniscus. We have successfully used the semitendinosus tendon in two patients who sustained neglected rupture of posterior cruciate ligament.