The journal of knee surgery
-
Multicenter Study
Adverse effects of increased body mass index and weight on survivorship of total knee arthroplasty and subsequent outcomes of revision TKA.
To investigate the effects of increased weight and body mass index (BMI) on total knee arthroplasty (TKA) survivorship and on functional outcomes and quality of life following revision TKA, a prospective cohort study of 291 consecutive revision TKA patients was performed. Average patient BMI was 32.3 +/- 7.7, and 57% of patients were obese (BMI > or = 30). The obese group was not significantly different from the nonobese group regarding reasons for prosthesis failure; however, they were more likely to experience certain comorbidities. ⋯ In regression analysis, BMI was a significant predictor of Short Form-36, WOMAC difficulty of function, and KSS. Weight and BMI have deleterious effects on the longevity of primary TKA and functional and quality of life outcomes following revision TKA. These findings indicate a need for more effective management of these patients.