What is the TfL muscle?

The TfL muscle, or Tensor Fasciae Latae, is a small muscle located on the outer side of the thigh near the hip. It plays a crucial role in stabilizing the pelvis during activities like standing, walking, and running. When giving a piggyback ride, for example, you might feel soreness in this area. The TfL also assists in abducting the hip, which means moving the leg away from the body's midline 1 2.

Despite its size, the TfL can significantly influence the function of the knee, back, and hip, and can become problematic if overworked. It can sometimes overpower other muscles during certain exercises, such as clamshells, by compensating improperly, which leads to perpetuated activation patterns and potential issues 2 3.