One of the most common causes of severe knee pain that may require replacement is osteoarthritis. Over time, the protective cartilage around the knee joint wears down due to regular use or injury. Without the cartilage cushion, the bones underneath can rub painfully against each other. For an estimated 10% of Americans aged 55 years and older, osteoarthritis leads to chronic knee pain and disability. Other conditions less frequently requiring knee replacement include rheumatoid arthritis, ... Read more
