Perth Chiropractor Dr. Sarah Pye demonstrates how to perform Varus Stress Test. The varus stress test at 20-30° of knee flexion is the actual workhorse test to perform when one is assessing for posterolateral instability of the knee. This test isolates out the function of the fibular collateral ligament. In effect, there should be no increase in varus gapping of the knee at 20-30° of flexion when the fibular collateral ligament is intact. When other structures are concurrently injured with a fibular collateral ligament tear, such as the popliteus tendon or popliteofibular ligament, there will be an increased amount of varus gapping present. Assessment of varus instability can be quite accurate in an experienced clinician's hands. Subtle increases in varus gapping can usually be assessed to determine the amount of instability. It has been found by stress radiographs that increases of 2.7 mm of lateral compartment gapping are indicative of a complete fibular collateral ligament tear, while increases of 4 mm of lateral compartment gapping are indicative of a complete posterolateral corner injury.
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