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Doctors test ways to spur knee cartilage to grow Doctors are testing new ways to spur cartilage to regrow in damaged knees, from implanted "cartilage plugs" to injections of bone-marrow stem cells. The need is huge. Knees are the joint most likely to go bad, and the cartilage that cushions them has only a limited natural ability to repair itself. The question is how to unlock that ability and give it a boost.
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