The rate of knee replacement procedures has doubled in the past decade, and more than 4.5 million people in the U.S. have had the surgery, according to a study presented at a meeting of the American Academy of Orthopaedic Surgeons. Researchers reported that 4.7% of adults 50 and older have had the surgery compared with 10% of those age 80 and older, but the greatest increase in procedures occurred among younger adults. Osteoarthritis was the primary reason for the surgery.

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