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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.
A woman is lunging on the sand. Photo Credit Dirima/iStock/Getty Images. Arthritis or another medical condition could be the cause of a stiff knee. Overuse of the joints and muscles in your knee can also cause stiffness. woman is lunging on the sand. Photo Credit Dirima/iStock/Getty Images. Arthritis or another medical condition could be the cause of a stiff knee. Overuse of the joints and muscles in your knee can also cause stiffness.