The effect of obesity on revision total knee arthroplasty: a retrospective cohort study

BACKGROUND: Obesity has been linked to higher rates of postoperative complications, delayed wound healing, reoperation, and re-revision rate following revision total knee arthroplasty (RTKA). This study examined the impact of obesity across various weight classes on RTKA outcomes: healthy weight (body mass index [BMI] < 25); overweight (BMI 25 to 29.9); class I obesity (BMI 30 to 34.9); class II obesity (BMI 35 to 39.9); class III, type 1 obesity (BMI 40 to 44.9); class III, type 2 obesity (BMI 45 to 49.9); and severe class III obesity (BMI ≥ 50). METHODS: and Fisher exact tests for categorical data. RESULTS: > 0.05). CONCLUSION: A BMI of 45 to 49.9 and ≥ 50 are risk factors for re-revision, postoperative infection, and readmission rates and increase the 90-day costs associated with RTKA.