Osteoarthritis, commonly known as wear-and-tear arthritis, is a condition in which the natural cushioning between joints -- cartilage -- wears away. When this happens, the bones of the joints rub more closely against one another with less of the shock-absorbing benefits of cartilage.
The rubbing results in pain, swelling, stiffness, decreased ability to move and, sometimes, the formation of bone spurs.
To learn more you should go to a specialist.
Keyword: knee pain osteoarthritis