Our desire to stay young and active is resulting in a surge of knee replacement surgeries and on the flip side - joint damaging obesity is adding to those numbers. More than 3 million Medicare patients who got artificial knees betweeeen 1991 and 2010 were studied - 10 percent of the surgeries were re-dos - replacing worn-out artificial joints. The number of initial knee-replacement surgeries each year on these older patients more than doubled during that time, rising to nearly 244,000 in 2010.
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