Twenty years ago, Dr. Jack Frankeny didn’t see many patients younger than 60 who needed a knee replacement. But what he calls “boomeritis” has changed that dramatically.

About 581,000 knee replacements are performed each year in the United States, according to the American Academy of Orthopaedic Surgeons, and studies show the number is projected to climb to around 3 million per year over the next 20 years as baby boomers maintain their active lifestyles.

The ultimate culprit causing knee pain is arthritis, mostly developed through a combination of aging, use and genetics. Injur

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