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Knee Replacements Double as Aging Patients Stay Active

Knee replacement surgeries have more than doubled over the past two decades in the U.S. as older Americans strive to stay active later in life, a study found.

Total knee replacement procedures rose 162 percent from 1991 to 2010 while the number of procedures to repair a previously implanted artificial knee joint, called revision, jumped 106 percent, according to research released in the Journal of the American Medical Association.