What condition is indicated by excessive posterior translation of the tibia during the Posterior Drawer Test?

The Posterior Drawer Test is specifically designed to assess the integrity of the posterior cruciate ligament (PCL). When excessive posterior translation of the tibia is observed during this test, it strongly indicates a PCL injury. The PCL functions to prevent the posterior displacement of the tibia relative to the femur, so when this ligament is compromised, the tibia can move excessively posteriorly.

In contrast to a PCL injury, an anterior cruciate ligament (ACL) injury would result in excessive anterior translation of the tibia. The medial collateral ligament (MCL) and lateral collateral ligament (LCL) primarily stabilize the knee in its medial-lateral (side-to-side) movement and are not directly responsible for controlling posterior tibial translation. Therefore, the signs and symptoms seen during the Posterior Drawer Test specifically point to issues with the PCL, making it the correct answer in this scenario.