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Background/Purpose:   To clarify the relationship between body mass index (BMI) and quality-of-life (QOL) recovery in individuals who underwent total knee arthroplasty (TKA).Methods:   This prospective cohort study included 80 individuals who underwent TKA. The dependent variable was the Japanese Knee Osteoarthritis Measure used for assessing the QOL, and the independent variables were age, sex, BMI, and the Kellgren–Lawrence grade. A hierarchical multiple regression analysis was used to clarify whether BMI was a significant independent variable after accounting for other factors.Results:   Sex was found to be the only significant predictor ( β = 0.29, p &lt; 0.05), and BMI was not related to QOL recovery in individuals who underwent TKA.Conclusion:   This result suggests that sex was related to QOL recovery and should be assessed and that BMI was not related to QOL recovery in individuals who underwent TKA. These results may help health-care providers to identify individuals who might struggle with QOL recovery.

Does body mass index influence quality-of-life recovery in individuals who underwent total knee arthroplasty: A prospective study