Which muscle assists in hip abduction and medial rotation?

The muscle involved in hip abduction and medial rotation is the tensor fasciae latae. This muscle is located on the lateral aspect of the thigh and plays a crucial role in stabilizing the hip and knee during movement. It works by pulling on the iliotibial band—a thick band of connective tissue that runs along the outside of the thigh—helping to maintain balance and promote proper leg alignment while walking or running.

In terms of its specific actions, the tensor fasciae latae contributes to the abduction of the thigh, moving the leg away from the midline of the body, and it also assists in medial rotation, which means it helps to turn the thigh inward. This dual function is particularly important in activities that require stabilization of the pelvis during dynamic movements.

Other muscles mentioned do not primarily perform these actions. The vastus intermedius is a part of the quadriceps group and primarily functions in knee extension. Quadratus femoris is involved in lateral rotation of the thigh. The sartorius, while it helps in hip flexion and lateral rotation, is not primarily responsible for abduction. Thus, the tensor fasciae latae is the muscle that correctly fulfills the roles of assisting in both hip abduction and medial rotation.