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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.
Unlike other connective tissues like bone, cartilage does not contain blood vessels. Therefore, cartilage grows and repairs more slowly. However, this repairing capability is limited. Remember that chondrocytes are bound in a space called the lacunae; therefore, they cannot move to a damaged area to repair it.