Iliotibial Band Syndrome (Outer Knee Pain)

Overview

The iliotibial band (ITB) is a thick strip of connective tissue running down the outside of the thigh from the hip to just below the knee. Iliotibial band syndrome is pain on the outer side of the knee where the band passes over the bony bump of the thigh bone. It is one of the most common overuse injuries in runners and is also frequent in cyclists.

The pain has a distinctive pattern: it is often absent at the start of a run, then appears sharply at a predictable distance or time, and can become severe enough to force you to stop. Downhill running and slow jogging tend to make it worse, and it may ache afterwards when going down stairs. Rest usually settles it, only for it to return once training restarts — which is why addressing the underlying cause matters.

Current understanding is that the problem is compression of a sensitive fat pad beneath the band, rather than the band "rubbing" or being tight. Stretching the band itself therefore has limited value; improving hip strength and running mechanics is more effective.

Causes and risk factors

• A sudden increase in running mileage or a new long-run distance
• Downhill running or always running on the same side of a cambered road
• Weak hip abductor (outer hip) muscles letting the knee fall inward
• A narrow running stride or crossing the feet over the midline
• Cycling with a saddle that is too high or cleats poorly aligned
• Leg-length difference or foot posture that alters knee alignment
• Worn-out trainers

How we may be able to help

We assess the outer knee and hip to confirm the diagnosis and rule out other causes of lateral knee pain, such as a meniscus problem. We then look at hip strength, single-leg control and — where possible — your running pattern or bike set-up, because the pain is usually a symptom of how the leg is being loaded.

Physiotherapy focuses on strengthening the hip and gluteal muscles, improving single-leg control and adjusting your training so the tissue can settle without complete rest. Simple running-form cues, such as a slightly higher cadence or wider step, can reduce compression at the knee. Manual therapy and soft-tissue work on the outer thigh and hip may ease tension in the surrounding muscles.

Kinesiology taping may give short-term relief for some runners. If foot posture is contributing, a 3D foot scan and custom orthotics may be considered. Interferential therapy is occasionally used as an adjunct when the outer knee is very irritable.

What you can do at home

• Cut back running volume to below the distance that triggers pain, rather than stopping completely
• Avoid downhill routes and cambered roads for a few weeks
• Strengthen the outer hip: side-lying leg raises, clam shells and single-leg balance
• Try shortening your stride slightly and increasing cadence by 5–10%
• Cyclists: check saddle height and cleat position, or have a bike fit
• Replace trainers that have lost their cushioning