Both varus and valgus stress tests should be performed with the knee in a fully extended position.

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Varus and valgus stress tests are typically performed with the knee in both fully extended and slightly flexed positions (about 20-30 degrees of flexion) to assess the integrity of the lateral and medial collateral ligaments, respectively. Fully extending the knee locks the knee joint, making it difficult to assess the collateral ligaments accurately.

Both Varus and Valgus Stress Tests Should Be Performed with the Knee