Outline what occurs within the structure of bone as the aging process proceeds. More calcium is leeched into the blood than reabsorbed into bone, the matrix thins, the bone becomes more brittle. Discuss this leads to spontaneous fractures, and view the different types of fractures. Show x rays of a knee joint which indicates an inflammation of the joint. Explain this as being a form of arthritis. Discuss the 2 types of arthritis, osteoarthritis and rheumatoid arthritis. Indicate that RA is an autoimmune disease which may be triggered by a bacterial or viral infection. Discuss and outline the available treatment protocols used to treat both types.