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More Than 4 Million Americans Have New Knee
Date:2/10/2012

By Madonna Behen
HealthDay Reporter

FRIDAY, Feb. 10 (HealthDay News) -- More than 4 million Americans now live with an artificial knee, and increasing numbers of younger patients are undergoing knee replacement surgery, new research reveals.

Researchers at Brigham and Women's Hospital in Boston estimate that more than half of adults who are diagnosed with knee osteoarthritis will receive a total knee replacement in their lifetime.

Senior author Elena Losina, co-director of the hospital's Orthopaedic and Arthritis Center for Outcomes Research, said the country's aging population and high rates of obesity are only partly responsible for the rise in total knee replacements.

"We think that as more and more people began participating in active sports, they sustained injuries earlier in life, and therefore developed knee osteoarthritis earlier," Losina said. "And these active people are probably more willing to undergo surgery that will enable them to continue to be active."

Also, with improved success rates over the past 20 years, "surgeons are more comfortable offering it, and patients are more comfortable having it," Losina added.

A shorter postoperative hospital stay has also made the procedure more acceptable, she said. "Ten or 15 years ago, patients stayed in the hospital for a week," Losina said. "Now, they're usually discharged on the third day after surgery."

The number of new-knee procedures doubled over the last decade, reached more than 620,000 in 2009, and the researchers said younger patients -- those 45 to 64 -- accounted for a disproportionate amount of that growth. Their relatively young ages means many are at risk of revision surgery as well as potential long-term complications of surgery, the authors warned.

The researchers estimate that more than 4.2 million Americans currently have an intact total knee replacement, which represents 4.4 percent of the total population age
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