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. Obesity may also be a factor as more people wear out their joints with excess weight.

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

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