Cost-effectiveness and clinical utility of universal pre-admission MRSA screening in total joint arthroplasty patients

Background: For patients undergoing total joint arthroplasty (TJA), pre-admission meticillin-resistant Staphylococcus aureus (MRSA) nasal screening has been widely adopted to prevent postoperative joint infection. However, screening cost-effectiveness and clinical utility have not been adequately evaluated. Aim: To assess the MRSA infection rate, associated costs, and costs of screening at our institution, before and after screening implementation. Methods: This was a retrospective cohort study examining patients who underwent TJA at a health system in New York State, between 2005 and 2016. Patients were divided into the 'no-screening' group if the operation occurred prior to adoption of the MRSA screening protocol in 2011 and the 'screening' group if afterwards. The number of MRSA joint infections, cost of each infection, and costs associated with preoperative screening were recorded. Fisher's exact test and cost comparison analysis were performed. Findings: The no-screening group had four MRSA infections in 6088 patients over a sevenyear period, whereas the screening group had two in 5177 patients over five years. Fisher's exact test showed no significant association between screening and MRSA infection rate (P 1/4 0.694). The cost of postoperative MRSA joint infection treatment was US$40,919.13 per patient, whereas annual nasal screening was US$103,999.97. Conclusion: At our institution, MRSA screening had little impact on infection rates and led to increased costs, with 2.5 MRSA infections required annually to meet the costs of screening. Therefore, the screening protocol may be best suited for high-risk populations, rather than the average TJA patient. The authors recommend a similar clinical utility and costeffectiveness analysis at other institutions implementing MRSA screening programmes. & COPY; 2023 The Healthcare Infection Society. Published by Elsevier Ltd. All rights reserved.