Got a bum knee? Here is what to do
Does your knee hurt? Your first thought might be that it's arthritis, and you would have a good chance of being right. The most common form of the disease, osteoarthritis, is caused by wear and tear of the knee cartilage and affects some 27 million Americans. But pain and other knee symptoms can be caused by to other things—some you don't need to worry about too much, but there are others that will need attention.
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