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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.
This occurs when the cartilage that cushions the small facet joints in the spine breaks down. When this happens, the back bones rub together and cause damage and pain. Osteoarthritis is caused by the normal wear and tear of the cartilage as you age.