The Journal of Arthroplasty, Volume 28, Issue 8, 101 - 105

Effect of Body Mass Index on Limb Alignment After Total Knee Arthroplasty

Estes, Chris S. et al.

Prior studies have reported increased failure rates in obese patients with postoperative limb mal-alignment. This study was undertaken to determine if a relationship exists between postoperative limb alignment and BMI in patients undergoing primary TKA performed with mechanical instruments. An IRB-approved retrospective review of 196 knees was undertaken. Limb alignment was determined on full-length, standing, hip-to-ankle x-rays, preoperatively and postoperatively. The effects of gender, side, preoperative mechanical alignment and BMI on postoperative alignment were analyzed via multivariate regression analysis. Both preoperative mechanical limb alignment (P < 0.001) and BMI (P = 0.009) had a significant effect on postoperative limb alignment following TKA performed with mechanical instruments.

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