Valgus stress
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The Valgus stress test is a test for ligament damage. It involves placing the leg into extension, with one hand placed as a pivot on the knee. With the other hand placed upon the foot applying an abducting force, an attempt is then made to force the leg at the knee into valgus. If the knee is seen to open up on the medial side, this is indicative of medial ligament and / or cruciate ligament damage.
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There are two versions of this test. Valgus at 0 degrees and valgus at 30 degrees. 0 tests for mcl as well as some other ligaments like the cruciates. 30 excludes them and only tests the mcl.