Iliotibial band syndrome is often called IT band syndrome. It's a health problem that causes pain on the outside of the knee often in athletes or those who suddenly increase their exercise intensity.

The bones of your knee joint are your thighbone (femur), your shinbone (tibia), and your kneecap (patella). Your iliotibial band is a strong, thick band of tissue that runs down the outside of your thigh. It extends all the way from your hip bones to the top of your shinbone. Iliotibial band syndrome is an overuse injury that leads to pain and tenderness near the lower end of this band, on the outside of the knee.

Iliotibial band syndrome is fairly common in distance runners, cyclists, and others whose activities include repetitive knee bending and straightening.

Researchers are still debating the exact cause of iliotibial band syndrome. The pain may relate to movement of the iliotibial band as the knee bends and straightens. The iliotibial band may also abnormally compress the tissue beneath it, causing pain.

It's clear that repetitive bending and extending of the knee is in some way responsible for iliotibial band syndrome. This is true no matter the specific cause.

Iliotibial band syndrome happens most commonly in distance runners. But it may also happen from other sports. These include cycling, skiing, rowing, or soccer.

It is not clear what increases the risk of iliotibial band syndrome, and it may be a combination of many things. You might be more likely to develop iliotibial band syndrome if you:

• Suddenly increase how far you go in your workouts, or routinely do long-distance workouts.
• Run on uneven or downhill terrain.
• Run in worn-out shoes.
• Have weakness or tightness in certain muscles of the legs or hips.
• Have legs that slope a little inward from your knee to your ankle (bowlegged).
• Have poorly fitted equipment, such as your bicycle, or poor technique.
• Exercise in cold weather.

Iliotibial band syndrome causes pain on the outside of the knee. It might affect one or both of your knees. The pain is an aching, burning feeling that sometimes spreads up the thigh to the hip. You might notice this pain only when you exercise, especially while running. The pain tends to be at its worst right after you strike your foot, and it might only start up near the end of your workout. As the condition gets worse, your pain might start earlier and continue even after you've stopped exercising.

Your doctor will start with a health history. They will also ask about your other health problems as well as your current symptoms. They will do a physical exam, including a full exam of your knee. This will include tests of your range of motion, strength, and sore areas of your knee. Your doctor will need to distinguish between iliotibial band syndrome and other possible causes of your knee pain. These can include osteoarthritis or a meniscal tear.

Usually, you won't need any additional tests to diagnose iliotibial band syndrome. If the diagnosis is unclear, you might need imaging tests to rule out other possible causes. These can include an X-ray or MRI.

Your doctor might advise a few different treatment strategies to help ease your symptoms. These might include:

• Limiting activities that make your knee pain worse for a while, and returning to these activities slowly
• Icing the outside of your knee
• Taking over-the-counter pain medicines
• Getting corticosteroid shots to decrease inflammation
• Making changes to your activity, like lowering your bicycle seat for cycling or improving your running form
• Practicing special exercises to stretch and strengthen the muscles around your hip and your knee

You may find it helpful to work with a physical therapist as well.

These changes help most people with iliotibial band syndrome. Your doctor might advise surgery if you still have significant symptoms after 6 months of trying these other therapies. Several different surgical choices exist. You can discuss all your surgical choices with your doctor.

In some cases, iliotibial band syndrome is preventable. To help prevent a flare-up, take care to:

• Run on even surfaces.
• Replace your running shoes regularly.
• Ease up on your training.
• If you run on a track, make sure you run in both directions.
• Have an expert check your stance and technique for running and other sporting activities.
• Stretch your outer thigh and hamstrings regularly.

If you're new to exercise, start slowly and gradually increase your activity.

Ask your doctor or trainer if they have additional advice.

If your symptoms don't start to improve after a few weeks of treatment, plan to see your doctor soon. You may have a different kind of problem with your knee.

• Iliotibial band syndrome causes pain on the outside of your knee.
• It often happens in athletes, such as distance runners.
• Many things may increase risk, including fit of your sporting equipment, technique, and workout intensity.
• Most people respond to treatment, such as pain medicines, ice, stretching, and strengthening exercises, and limiting the activity for a while.
• Some people may need surgery to treat the condition.

Tips to help you get the most from a visit to your doctor:

• Know the reason for your visit and what you want to happen.
• Before your visit, write down questions you want answered.
• Bring someone with you to help you ask questions and remember what your doctor tells you.
• At the visit, write down the name of a new diagnosis, and any new medicines, treatments, or tests. Also write down any new instructions your doctor gives you.
• Know why a new medicine or treatment is prescribed, and how it will help you. Also know what the side effects are.
• Ask if your condition can be treated in other ways.
• Know why a test or procedure is recommended and what the results could mean.
• Know what to expect if you do not take the medicine or have the test or procedure.
• If you have a follow-up appointment, write down the date, time, and purpose for that visit.
• Know how you can contact your doctor if you have questions, especially after office hours or on weekends and holidays.