MOVING VALGUS STRESS TEST FOR MEDIAL COLLATERAL LIGAMENT INSUFFICIENCY OF THE ELBOW Alright, let's move on from posterolateral rotatory instability (PLRI) to medial at the elbow. If your patient is presenting after a trauma of the elbow and with medial elbow pain, one of the first things you want to test (after excluding a fracture) is the integrity of the ligaments. The moving valgus stress test is used to assess the medial collateral ligament at the elbow. According to a small study of O'Drisc