Osteoarthritis (OA), also called degenerative joint disease, is the most common chronic disease of the joints and affects more than 30 million Americans.

In normal joints, the cartilage that covers the end of each bone serves as a cushion and lubricant. In people with osteoarthritis, the cartilage wears down, causing pain, inflammation, and problems moving the joint. Although OA can affect any joint, it appears more frequently in the hips, knees, lower back,

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