In McMurray's test, which rotation is associated with a lateral meniscus tear?

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McMurray's test uses tibial rotation during knee extension to stress the menisci and elicit a tear sign. When the tibia is rotated internally and the knee is extended, the edges of the lateral meniscus are pinched between the femur and tibia. If a tear is present, this maneuver often produces pain and a palpable or audible click along the lateral joint line. That’s why internal rotation is associated with a lateral meniscus tear in this test. External rotation would stress the other meniscus, and neutral rotation doesn’t isolate a tear.