Understanding Iliotibial Band Syndrome
Iliotibial band syndrome, or IT band syndrome, is a condition that causes pain on the outside of the knee. It most often occurs in athletes, especially long-distance runners. It can happen if you cycle, ski, row, or play soccer. It can also occur in people who are starting to exercise.
What is the IT band?
The iliotibial (IT) band is a strong, thick band of tissue that runs down the outside of your thigh. It goes all the way from your hip bones to the top of your shinbone (tibia), just below your knee joint. The bones of your knee joint include your tibia, your thighbone (femur), and your kneecap (patella).
When you bend and straighten your leg, the IT band moves over the outer lower edge of your femur. Over time, bending and straightening your leg can cause the IT band to irritate nearby tissues and cause pain.
What causes IT band syndrome?
Researchers are still learning the exact cause of IT band syndrome. The pain may be caused by the IT band rubbing over the lower outer edge of the femur. This may cause inflammation in the bone, tendons, and small fluid-filled sacs (bursa) in the area. The IT band may also compress the tissue under it and cause pain.
If you are a runner, you might be more likely to develop IT band syndrome if:
You run on uneven or downhill terrain
You run on worn-out shoes
You run many miles per day
Your legs slope a little inward from your knee to your ankle (bowlegs)
Symptoms of IT band syndrome
IT 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 can spread up the thigh to the hip. You may feel this pain only when you exercise, such as while running. The pain may be worst right after you step on your foot. It may only happen near the end of your exercise. As the condition gets worse, pain may start earlier and continue after you have stopped exercising. Going up and down the stairs may make the pain worse.
Diagnosing IT band syndrome
Your doctor will ask about your health history and your symptoms. He or she will give you a physical exam. This will include an exam of your knee. The range of motion and strength of your knee will be tested. The doctor will look for areas of pain around your knee. The symptoms of IT band syndrome can be like those of osteoarthritis or a meniscal tear. Your doctor will need to make sure IT band syndrome is the cause of your symptoms. If the diagnosis is not clear, you may need imaging tests. These can include an X-ray or MRI scan.