American Association of Hip and Knee Surgeons Annual Meeting
American Association of Hip and Knee Surgeons Annual Meeting
December 03, 2019
2 min read

BMI predicted infection after TKA better than adipose tissue

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Simon W. Young

DALLAS — Results presented at the American Association of Hip and Knee Surgeons Annual Meeting showed BMI was a better predictor of periprosthetic joint infection after total knee arthroplasty compared with measures of adipose tissue.

Simon W. Young, MD, MBChB, FRACS, and colleagues recorded demographics, comorbidities, surgical duration and postoperative infection status within 1 year for 4,700 patients who underwent TKA between January 2013 and December 2016. Researchers analyzed preoperative weight-bearing anteroposterior and lateral X-rays to determine pre-patellar adipose thickness, bony width of the tibial plateau and total soft-tissue knee width, and calculated knee adipose index from the ratio of bone to total knee width.

In his presentation, Young noted researchers identified 31 periprosthetic joint infections. Knee adipose index had no statistical association with periprosthetic joint infection, according to Young.

“When we looked at pre-patella fat thickness, there was perhaps a slightly more favorable trend, but still no statistically significant association,” Young said.

However, he noted a correlation between BMI and periprosthetic joint infection, with an increased risk of periprosthetic joint infection among patients with a BMI greater than 35 kg/m2.

“When we put [BMI] through a multivariable model, it held up well with an increased odds ratio of 2.9 for a BMI greater than 35 [kg/m2],” Young said. – by Casey Tingle



Young SW, et al. Paper 22. Presented at: American Association of Hip and Knee Surgeons Annual Meeting; Nov. 7-10, 2019; Dallas.


Disclosure: Young reports he is a board or committee member for American Association of Hip and Knee Surgeons; is a paid presenter or speaker for Arthrex Inc., Smith & Nephew and Stryker; is a paid consultant for Stryker; receives research support from Stryker and Vidacare; and has stock or stock options from Surgical Solutions.