Some types of arthritis are genetic or inherited (i.e., they tend to run in families). Others are related to a chemical imbalance or are due to an overactive immune system. All forms of arthritis affect the joints; however, some also involve the muscles and connective tissues of the body.
OA is the most common form of arthritis, primarily affecting people over the age of 60 years. It is degenerative in nature - cartilage in the joints gradually wears away, causing the ends of the bones to rub against each other. OA can develop spontaneously for no apparent reason or be due to a secondary cause, where the joint damage results from an injury or trauma.
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