What motion does the ALL restrain of the tibia?

The correct answer is internal rotation. The anterior lateral ligament (ALL) is a ligament located in the knee that plays a crucial role in stabilizing the joint. It primarily functions to limit the internal rotation of the tibia relative to the femur. This stabilization is important during activities that involve twisting motions, such as sports or dynamic movements, as it helps to maintain the proper alignment of the knee and prevent injuries, particularly to the anterior cruciate ligament (ACL) and other soft tissues around the knee.

Furthermore, recognizing the role of the ALL in restricting internal rotation is fundamental in understanding the mechanics of the knee, especially in relation to injury prevention and rehabilitation strategies. It's crucial for clinicians and athletes alike to appreciate how this ligament contributes to knee stability during various activities.