If you’ve ever felt tightness along the outside of your thigh or knee—especially with running or gym work—you’ve probably been told it’s your IT band.
For many people, it starts as a mild awareness or stiffness. But over time, particularly with repeated loading, it can develop into sharper pain on the outside of the knee. This is commonly referred to as Iliotibial Band Syndrome, one of the most frequent overuse injuries seen in runners.
It’s often blamed on a “tight IT band.”
But here’s the thing… it’s not quite that simple.
What is the IT band?
The Iliotibial Band (IT band) is a thick band of connective tissue that runs down the outside of your thigh, from your hip to just below your knee.
Rather than being a muscle, it acts more like a support structure, helping to stabilise your hip and knee—especially during activities like walking, running, and single-leg movements.
It works closely with muscles around the hip, particularly the Glutes and Tensor Fasciae Latae to control how your leg moves and absorbs load.
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