Which anatomical structure does the IT Band work closely with during knee movements?

The iliotibial (IT) band is a long strip of connective tissue that runs down the outside of the thigh, and it plays a significant role in stabilizing the knee joint during movement. One of the major muscles that contributes to the function of the IT band is the gluteus maximus.

The gluteus maximus, being the largest muscle in the buttocks, originates in the pelvis and has a direct attachment to the IT band. This connection allows the gluteus maximus to help control the position and movement of the hip joint, which is closely linked to knee stability. As the gluteus maximus contracts, it pulls on the IT band, contributing to the stability of the lateral aspect of the knee during activities such as running, walking, and climbing.

While the quadriceps and hamstring muscles also interact with knee movements, they are primarily responsible for knee flexion and extension rather than directly working with the IT band. The patellar ligament connects the patella to the tibia and serves a different function related to the knee joint than that of the IT band. Thus, the close functional relationship between the IT band and the gluteus maximus during knee movements supports the selection of this specific answer.