A retrospective case-control study was conducted to assess whether patients who underwent sequential preoperative disinfection before primary total knee or unicompartmental arthroplasty had a lower rate of postoperative infection than those who did not. In our study, 1025 patients who underwent total knee or unicompartmental arthroplasty at 2 medical centers between September 1, 2020, and August 31, 2021, were enrolled. Statistical analysis was performed for 976 cases, including 966 and 10 uninfected and infected cases, respectively. All patients were followed up for 1-year. Data analysis was performed by binary logistic regression and adjusted for 2 confounding factors: general anesthesia and rheumatoid arthritis. IBM SPSS for Windows (version 25.0; IBM Co., Armonk, NY) software was used to perform all statistical analyses. During the study period, of the 976 patients, 10 cases of infections were detected. Sequential pre-disinfection (adjusted odds ratio 0.14, 95% confidence interval: 0.03-0.54, P = .005) could reduce the incidence of infection. Based on the results of this study, bathing the whole lower limb with 2% chlorhexidine on the night before surgery followed by 70% alcohol application 1 hour before surgery is effective for preventing periprosthetic joint infection during primary total knee or unicompartmental arthroplasty.
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