Please explain the concept of tensile and compressive stresses on both menisci in McMurray’s test. E.g. Which menisci suffers which force during internal rotation at the knee? When it says – INTERNAL ROTATION AT THE KNEE, does it mean tibial IR or femoral IR at the knee?

As far as clinical tests go, tensile stresses refer to pulling or distraction activities while compressive stresses refer to approximation activities. Most of the rotation that occurs at the knee joint involves the tibia moving against a fixed femur. As a result, IR at the knee refers to tibial IR while femoral IR would manifest its effect at the hip. Internal or medial rotation of the knee stresses the lateral meniscus while external or lateral rotation of the knee stresses the medial meniscus.