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Rheumatoid Arthritis: The Disease

Rheumatoid arthritis, also called RA, is a disease of the joints that most often affects the hands, wrists, feet and knees. In order to understand this disease, it is helpful to know how joints help us move. Bones support our bodies. Muscles help our bones move. Bones connect at joints. Cartilage and synovium line the joints. Cartilage is smooth and prevents the ends of the bones from rubbing together. The synovium makes a fluid that lubricates the joint. In a healthy joint, the cartilage and synovium work together to allow you to move your joints freely.
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