What is the function of the tensor fascia latae muscle?

The tensor fascia latae muscle plays a crucial role in stabilizing both the hip and knee joints. It is situated on the lateral aspect of the hip and is primarily responsible for tensing the iliotibial band, which is a thick band of connective tissue that runs down the outside of the thigh to the knee. By tightening the iliotibial band, the tensor fascia latae provides lateral stabilization of the hip during activities such as walking, running, and standing on one leg. This stabilization is essential for maintaining proper alignment and function of the lower extremity, especially during dynamic movements.

The muscle also assists in flexion and abduction of the hip and helps with internal rotation. However, its most significant contribution is its stabilizing effect, particularly during weight-bearing activities.