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Study overturns common assumption about knee replacements in morbidly obese individuals
Date:11/10/2012

After total knee replacement (TKR) surgery, patients who are morbidly obese have similar pain and function outcomes as patients who do not fall into this weight category, according to a new study by researchers at Hospital for Special Surgery. The finding is surprising given that numerous studies have shown that obese patients have worse outcomes. The study will be reported at the annual meeting of the American College of Rheumatology/Association of Rheumatology Health Professionals, to be held Nov. 9-14, in Washington D.C.

"As long as they are medically appropriate for surgery, even obese people can have excellent results from joint replacement. Obesity, in and of itself, should not be viewed as an absolute contraindication to joint replacement," said Lisa Mandl, M.D., M.P.H.., a rheumatologist at Hospital for Special Surgery (HSS), in New York City, who was involved with the study.

"We undertook the study because we are in the midst of an obesity epidemic," said Susan Goodman, M.D., a rheumatologist at HSS, who led the study. Until now, many studies examining TKRs in obese patients have lumped all patients with a body mass index (BMI) of 30 and higher into one category. "In my mind, there is clearly a difference in a patient with a BMI of 40, the morbidly obese, versus an obese patient with a BMI of 33," said Dr. Goodman. "We wanted to see if we could identify a difference in outcomes among those patients, and we found that the morbidly obese had just as good outcomes."

Overweight individuals are prone to developing osteoarthritis because the extra weight adds extra wear and tear on joints. An obese individual often requires a TKR decades before a patient who is of normal weight will require one.

To conduct their research, the HSS researchers turned to the HSS Total Joint Replacement Registry, a prospective registry started in 2007 that includes, among other things, data on all patients who seek care at HSS for knee replacement surgery. The
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Contact: Phyllis Fisher
phylils.fisher@gmail.com
212-606-1724
Hospital for Special Surgery
Source:Eurekalert

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