Which muscle is primarily attached to the IT Band?

The muscle primarily attached to the IT Band, or iliotibial band, is the Tensor Fascia Latae (TFL). This muscle originates from the anterior aspect of the iliac crest and the anterior superior iliac spine (ASIS) and attaches to the IT band, which runs down the lateral aspect of the thigh and inserts on the lateral condyle of the tibia.

The TFL plays a key role in stabilizing the pelvis during walking and running, as well as assisting with hip flexion, abduction, and medial rotation. Its connection to the IT band contributes to these functions, providing tension and support along the outside of the thigh.

In contrast, the Rectus Femoris, Sartorius, and Iliopsoas do not attach directly to the IT Band and perform different roles. The Rectus Femoris is a part of the quadriceps and primarily aids in knee extension, while the Sartorius contributes to flexion, abduction, and lateral rotation of the hip. The Iliopsoas is a major flexor of the hip joint. Each of these muscles has distinct anatomical attachments and functions that do not involve the iliotibial band directly.