IT Band Syndrome

What it is

ITBS is pain on the outer side of the knee, and it usually builds during a run, often at about the same point each time, and eases with rest. The iliotibial band is a long band of tissue down the outside of the thigh.

A 2024 review puts ITBS at about 10% of all running-related injuries¹, and a 2023 meta-analysis says it is twice as likely to affect female runners as male runners².

Why stretching is unlikely to fix it

One 2022 review of the usual physical therapy measures concludes that intermittent stretching is unlikely to change the band's length or mechanical properties. The same review lists excessive stiffness of the band among the factors that may promote ITBS, so the band is not simply normal³. Do not count on stretching or rolling out the band to be the treatment.

Weak hip muscles are a plausible cause but not an established one. A 2023 meta-analysis found that female runners with current ITBS had lower isometric hip abductor strength (the muscles on the outside of the hip) than controls. It says risk factors differ between female and male runners, with hip abductor weakness a possible risk factor in female runners with current ITBS only².

What was tried

Hip abductor strengthening is the most-used treatment. A 2024 systematic review of 13 studies (201 participants, five of them randomized trials) found it was the common strategy. The studies reported pain and function improving over 2 to 8 weeks and differed too much for a meta-analysis. The authors conclude that an approach built on hip abductor strengthening, possibly with shockwave or manual therapy, is effective, and that gait retraining needs rigorous trials¹.

A 2022 review is more cautious. It notes that hip abductor strengthening may correct excessive hip adduction but may also increase strain in the band, that high recurrence rates cast doubt on whether common treatments reach the cause, and that running retraining is promising but understudied³.

Running with it

Because the research is conflicting, management is individual, and the sensible first step is a diagnosis: lateral knee pain has other causes, and the site of pain is not always its source.

• Cut back the running that provokes the pain. A physical therapist's rule for returning runners: pain stays at 3 out of 10 or lower (4 at most) while you run and is stable or improving over the weeks, you stop the run if it climbs above that, and the knee is back to its usual level within 24 hours of finishing. A limp, or any change in how you move, is a stop. Your clinician may set a different limit. The guide on return to running covers the order of return.
• Keep your aerobic fitness with work that adds no lower-body impact, at an easy conversational effort, which is zone 2 in a five-zone model.
• Add hip and leg strength once you have been cleared, ideally after a professional has looked at how you run. Single-leg work suits a runner whose sides differ in strength.
• Rebuild so that no run is much longer than your longest run of the last 30 days. In 5,205 runners followed for 18 months, injuries were more common when a session was more than 10% longer than that⁴. Bring hills back last.

When to see a professional

A physical therapist's assessment is worth having. See a sports-medicine professional if outer-knee pain is not easing after a couple of weeks of reduced running, comes back each time you build up, or you are unsure of the cause. Seek prompt care for significant swelling, locking or giving way, or pain from a specific injury.