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Osteoarthritis is a joint disease that mostly affects cartilage. Cartilage is the slippery tissue that covers the ends of bones in a joint. Healthy cartilage allows bones to glide over each other. It also helps absorb shock of movement.
As cartilage wears away (osteoarthritis) or erodes because of inflammation (rheumatoid arthritis), the affected joint no longer functions normally. 1  Range of motion of the joint is affected, and simply put, you can't move like you used to. You've developed physical limitations.