November 06, 2015
1 min read

Higher rates of obesity seen over time in patients undergoing revision TKA

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DALLAS — Research presented here at the American Association of Hip and Knee Surgeons Annual Meeting found patients undergoing revision total knee arthroplasty have become significantly more at risk for obesity in recent years.

“[The] obesity rate among revision knee patients is increasing at an alarming rate and outpaces that of index knee patients,” Susan M. Odum, PhD, said in her presentation here.

Odum and colleagues reviewed discharge data from the National Inpatient Sample database on 451,982 patients who underwent revision total knee arthroplasty (TKA) between 2002 and 2012. Using a BMI greater than 30 as a cut-off, investigators classified 70,470 patients as obese and 335,257 patients as non-obese. Trends in obesity rates were tracked via chi-square tests, and a multivariate logistic regression analysis was performed for variables, such as patient demographics, payer/hospital type and patient health status.

Susan M. Odum

After adjusting for all pertinent variables, investigators found a revision TKA patient was 4.1-times more likely to be obese in 2011 and 4.5-times more likely to be obese in 2012 than in 2002. A significant increase was observed in the obesity rates between 2002 (9.74%) and 2012 (24.57%). Significant risk factors for higher obesity rates were female gender (1.5-times more likely to be obese) and age between 45 years and 64 years (3.2-times more likely to be obese).

“Revision knee is not considered an elective procedure, therefore the best time for BMI reduction occurs prior to the index procedure,” Odum said. — by Christian Ingram


Odum SM, et al. Paper #1. Presented at: American Association of Hip and Knee Surgeons Annual Meeting. Nov. 6-8, 2015; Dallas. 

Disclosure: Odum reports she is a board member for The Journal of Arthroplasty and the American Association of Hip and Knee Surgeons.