How does arthritis affect the knee?

Knee pain is sometimes caused by deformity or injury, but one of the most common causes is osteoarthritis (OA), also known as degenerative joint disease. In a joint that has been damaged by arthritis the cartilage becomes inflamed and wears down, causing bone to rub against bare bone, creating pain, stiffness, deformity and loss of mobility. And since it’s a degenerative disease, it just gets worse over time. Other common causes of joint pain include rheumatoid arthritis or post-traumatic arthritis1.

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