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Arthritis means joint inflammation.. It causes pain and swelling in the body's joints, such as the knees or hips. There are many types of arthritis, but osteoarthritis is the most common.
1 The iliotibial band is a piece of tough tissue that runs from your hip down to the outer part of your knee. 2  If it's irritated by overuse or other problems, it can become inflamed and cause pain on the outer side of the knee.3  Osgood-Schlatter Disease. The iliotibial band is a piece of tough tissue that runs from your hip down to the outer part of your knee. 2  If it's irritated by overuse or other problems, it can become inflamed and cause pain on the outer side of the knee.