Post-operative Weight Gain After Total Knee Arthroplasty: Prevalence and Its Possible Attenuation Using Intraoperative Sensors


  • Gregory Golladay MD
  • Gerald Jerry MD
  • Kenneth Gustke MD
  • Martin Roche MD
  • Leah Elson BSc
  • Christopher Anderson MSc



As the proportion of adults with obesity continues to climb, so too does the need for total knee arthroplasty. Unfortunately, total knee replacement patients often experience post-operative weight gain, despite improved joint function. The purposes of this study were: 1) To execute a literature meta-analysis in order quantify the changes in body mass that are typically observed following TKA, and 2) Evaluate data from a prospective, multicenter study to assess any trends towards weight loss in a group of “balanced”, sensor-assisted TKA patients. The literature review found that average proportion of patients who had weight gain after TKA is 47% to 66%. In literature, the average post-operative weight gain was 9.5 lbs. (1.6 kg/m2 BMI increase), up to 14 lbs. (2.3 kg/m2). In the multicenter study, only 30.4% of patients and 36.9% of patients exhibited weight gain at 6 months and 1 year, respectively. At the 1-year interval, this indicates an 11% decrease from reported averages (p=0.049), up to 29% as reported by the NIH (p<0.001). The average weight gain in the multicenter patient group was 4.3 lbs. (0.72 kg/m2 BMI increase) at 6 months, and 3.5 lbs. (0.58 kg/m2) at 1 year, both of which are non-clinically meaningful. The average weight loss of those in the non-gaining group was 7.8 lbs. (1.3 kg/m2) at 6 months and 9.6 lbs. (1.6 kg/m2) at 1 year. Both of these values are clinically meaningful. This evaluation demonstrates that weight gain after TKA is prevalent, but ensuring soft-tissue balance (via technologies such as intraoperative sensing) may help mitigate this expected increase in body mass.

Keywords: total knee arthroplasty, increased BMI, intraoperative sensors, weight gain, obesity


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How to Cite

Golladay MD, G., Jerry MD, G., Gustke MD, K., Roche MD, M., Elson BSc, L., & Anderson MSc, C. (2014). Post-operative Weight Gain After Total Knee Arthroplasty: Prevalence and Its Possible Attenuation Using Intraoperative Sensors. Reconstructive Review, 4(1).



Original Article