Glossary
Iliotibial band (IT band)
Quick answer
The iliotibial band, or IT band, is a long, thick strip of connective tissue running down the outer thigh from the hip to just below the knee. It helps stabilise the outer knee and hip, and irritation where it crosses the knee is a common cause of outer knee pain in runners, notes Doha knee surgeon Dr. Pablo Gelber.
What it is
The IT band begins from muscles at the hip, the tensor fasciae latae and part of the gluteus maximus, and runs down the outside of the thigh. It attaches to a bump on the outer tibia called Gerdy's tubercle, with fibres also linking to the kneecap and the outer femur. It is not a muscle, so it cannot really be stretched much; its tension depends largely on the hip muscles above it.
Why it matters for patients
Repetitive bending and straightening, as in long-distance running, cycling and hiking, can irritate the tissues under the band where it passes over the outer femur. This is IT band syndrome: a sharp or burning pain on the outer knee that often starts at a predictable point in a run and is worse downhill. Training load changes, such as more distance or more hills, are common triggers.
Treatment usually focuses on adjusting training, strengthening the hip muscles and gradual return. Surgery is rarely needed. The band also contributes to stability of the outer knee and is sometimes used during ligament surgery to add rotational control.
Frequently asked questions
Does foam rolling fix IT band pain?
Some people find it eases symptoms for a while, but it does not lengthen the band. Load management and hip strengthening are the core of treatment.
Is outer knee pain when running always the IT band?
No. The lateral meniscus, the LCL, the popliteus tendon and kneecap problems can also cause pain on the outer side. A knee examination helps tell them apart.
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