CELL THERAPIES for osteoarthritis? “Aging and accumulated damage are expensive. If they didn’t happen the total cost of health care would be a small fraction of what it is today. Rejuvenation of the body’s own repair systems is the best way to solve most aging problems. The most promising technique for joint repair involves extracting cells from cartilage, growing up the cells, and then reinjecting these cells so that they’ll repair the joint.”