Tensor fasciae latae

A muscle located on the outer side of the thigh that plays a key role in the stabilization of the hip and knee.

Tensor fasciae latae is a muscle situated on the lateral aspect of the hip. It originates from the anterior part of the iliac crest and the anterior superior iliac spine. This muscle inserts into the iliotibial tract, which extends down the outside of the thigh. It is primarily responsible for providing tension to the iliotibial band, a thickened strip of fascia that helps stabilize the hip and knee.

Terminologia Anatomica

tensor-fasciae-latae

System

Muscular system

Function

The tensor fasciae latae plays a vital role in several movements and functions of the lower body. Primarily, it aids in hip flexion, abduction, and medial rotation. By stabilizing the hip joint during movements, it helps maintain balance while walking, running, or engaging in dynamic activities. In addition, the tension it creates in the iliotibial tract helps to stabilize the knee joint, especially during activities involving lateral movements, such as sports. When the leg is lifted or moved to the side, the tensor fasciae latae contracts, allowing for better stability and reducing the risk of injury to both the hip and knee.

Location

Located on the lateral aspect of the thigh, the tensor fasciae latae is positioned between the rectus femoris anteriorly and the gluteus maximus posteriorly. It originates from the outer lip of the iliac crest, extending from the anterior superior iliac spine to the greater trochanter of the femur. Its insertion into the iliotibial tract occurs approximately halfway down the thigh, where the tract itself runs along the outer leg to the tibia, thereby linking the hip to the knee. This unique positioning allows it to influence movement and stability in both the hip and knee joints effectively.

Did You Know?

The tensor fasciae latae is one of the few muscles in the body that functions primarily to tighten the connective tissue (iliotibial band) rather than moving a bone directly.
While it is small, the tensor fasciae latae is critical for athletic activities, acting as a key player in running and jumping.
This muscle can become tense or tight in people who sit for long periods, potentially leading to discomfort in the hip and knee joints.