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The Journal of Arthroplasty, ISSN: 0883-5403, Vol: 23, Issue: 6, Page: 795-800
Knee
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The Impact of Morbid Obesity on Patient Outcomes After Total Knee Arthroplasty
Rajgopal, Vaishnav; Bourne, Robert B; Chesworth, Bert M; MacDonald, Steven J; McCalden, Richard W; Rorabeck, Cecil HKnee
Five hundred fifty patients who underwent primary total knee arthroplasty between 1987 and 2004 with a primary diagnosis of osteoarthritis and 1-year outcome data (Western Ontario and McMaster Osteoarthritis Index [WOMAC]) were evaluated. Patients were stratified into body mass index categories based on the World Health Organization classification of obesity. Patients were dichotomized into a class III morbidly obese group and a non–morbidly obese group. Independent t test and multivariable linear regression were used to determine if a difference existed in the 1-year WOMAC outcome between morbidly obese patients and all other patients. Although 1-year outcomes were worse for morbidly obese patients (P < .05), they showed greater improvement in function compared with non–morbidly obese patients. Morbid obesity does not affect 1-year outcomes in patients who have had a total knee arthroplasty.
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