Whats the difference between Osteoporosis and Osteoarthritis?

Osteoporosis is when your body decides to get its calcium from your bones, (and not give it back) Osteoarthritis is the subcatagory of arthritis that describes the nature of the arthritis, which is inflammation of the joints. (in this case, due to wear and tear and reduction of joint fluid(s).) as opposed to Rhumatoid Arthritis which has an immune system component.

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