Which structure is assessed by the Knee Varus Stress Test?

The Knee Varus Stress Test is specifically designed to assess the integrity of the lateral collateral ligament (LCL). This test is performed with the knee in a slightly flexed position, and a varus force is applied to the knee. The application of this force tests the LCL by placing stress on the outer aspect of the knee. If there is excessive movement or gapping at the lateral joint line during this test, it indicates a potential injury or instability of the LCL.

While the other ligaments also play crucial roles in knee stability, they are not the primary structures being evaluated by the Knee Varus Stress Test. For instance, the anterior cruciate ligament (ACL) and posterior cruciate ligament (PCL) primarily manage anterior-posterior stability of the knee and are assessed through different tests. The medial collateral ligament (MCL) is evaluated using a valgus stress test, which applies a force in the opposite direction. Thus, the focus of the Knee Varus Stress Test on the lateral collateral ligament makes it the correct answer in this context.