The posterior cruciate ligament (PCL) plays an integral role in stabilizing the knee joint as a main restraint to posterior displacement of the tibia. When the tibial insertion of the PCL is avulsed, the knee becomes unstable, so that rotational instability, meniscus injury and degenerative change may develop within several years. Therefore early repair is necessary. The purpose of this report is to evaluate the usefullness of the direct posterior approach to the avulsion site of PCL. We treated 8 isolated avulsion injury of the PCL from January 1995 to May 1997 through the way of using the Burks and Schaffer's simplified posterior approach. The results were as follows; 1. The stability was achieved with screw fixation. and the outcome was above good in 87.5% of cases. 2. The Burks and Schaffer's simplified posterior approach ws concerned as an useful one for the fixation of an avulsion fragment of PCL. 3. The patients returned daily living within 3 months after operation.