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Osteoarthritis (sometimes called arthrosis or osteoarthrosis) is a condition that affects your joints. The surfaces within your joints become damaged so the joint doesn’t move as smoothly as it should.
When a joint develops osteoarthritis, some of the cartilage covering the ends of the bones gradually roughens and becomes thin, and the bone underneath thickens. All the tissues within the joint become more active than normal – as if your body is trying to repair the damage: