The iliotibial band (ITB) is a tendon that runs along the outside of your leg. It connects from the top of your pelvic bone to just below your knee. A tendon is thick elastic tissue that connects muscle to bone.
Iliotibial band syndrome occurs when the ITB becomes swollen and irritated from rubbing against the bone on the outside of your knee.
IT band syndrome - aftercare; Iliotibial band friction syndrome - aftercare
More About Your Injury
There is a water-filled sac, called a bursa, between the bone and the tendon at the side of the knee. The rubbing of the tendon can cause pain and swelling of the bursa, the tendon, or both.
This injury often affects runners and cyclists. Bending the knee over and over during these activities can create irritation and swelling of the tendon.
Other causes include:
- Being in poor physical condition
- Having a tight ITB
- Not warming up before exercising
- Having bowed legs
- Changes in activity levels