Anterolateral rotatory instability is an excessive internal rotation of the tibia on the femur when the knee is bent, leading to excessive opening of the joint at the outer (lateral ) side.
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CLINICAL PUBLICATIONS
The Anterolateral Ligament is Not the Whole Story: Reconsidering the Form and Function of the Anterolateral Knee and its Contribution to Rotatory Knee Instability. Sheean AJ, Shin J, Patel NK, Lian J, Guenther D and Musahl V. Tech Orthop. 2018 Dec; 33(4): 219–224.
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The test for anterolateral rotatory instability is also called the 'Slocum Test'. Here is a video showing the Slocum test and embedded courtesy of 'HDAllDay21' -