Iliotibial Band Syndrome (Runner's Knee)
The iliotibial band is a connective tissue that attaches the buttock muscles to the shin bone. It helps to straighten the knee and move the hip sideways. The band is prone to friction from rubbing against the femur especially when it is bent at a 20 to 30 degree angle, such as when the foot hits the ground when running.
This syndrome causes pain on the outside of the knee, which is made worse by running. Flexing the knee will prove painful, especially when pressure is applied to the sore area. Weakness in moving the hip sideways is another side effect of this syndrome, as well as tenderness in the buttock area.
People with iliotibial band syndrome should rest and ice the knee to reduce inflammation. Stretching and massaging the band after exercising is helpful in preventing tightness.