25dkou573 10.3205/25dkou573 urn:nbn:de:0183-25dkou5735 Meeting Abstract Burger Burger Joost J

Center for Musculoskeletal Surgery, Charité – Universitätsmedizin Berlin, Berlin, Deutschland

author Pichler Pichler Lorenz L

Center for Musculoskeletal Surgery, Charité, Berlin, Deutschland

author Grimberg Grimberg Alexander A

German Arthroplasty Registry (EPRD Deutsche Endoprothesenregister gGmbH), Berlin, Deutschland

author Wu Wu Yinan Y

German Arthroplasty Registry (EPRD Deutsche Endoprothesenregister gGmbH), Berlin, Deutschland

author Perka Perka Carsten C author Kladny Kladny Bernd B

i+M Fachklinik Herzogenaurach, Herzogenaurach, Deutschland

author Braun Braun Sebastian S

German Arthroplasty Registry (EPRD Deutsche Endoprothesenregister gGmbH), Berlin, Deutschland

author German Medical Science GMS Publishing House

Düsseldorf

610 20251031 engl This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 License. Dieser Artikel ist ein Open-Access-Artikel und steht unter den Lizenzbedingungen der Creative Commons Attribution 4.0 License (Namensnennung). M0634 573 Deutsche Gesellschaft für Orthopädie und Unfallchirurgie Deutsche Gesellschaft für Orthopädie und Orthopädische Chirurgie Deutsche Gesellschaft für Unfallchirurgie Berufsverband für Orthopädie und Unfallchirurgie Deutscher Kongress für Orthopädie und Unfallchirurgie (DKOU 2025) Abstracts | Osteoporose Berlin 20251028 20251031 AB91-4072 TextObjectives and questions: Total knee arthroplasty has often been preferred for rheumatoid arthritis (RA) patients, as it addresses all compartments of the knee and provides a more comprehensive solution. However, with advancements in RA treatment, particularly the increased use of disease-modifying antirheumatic drugs, unicompartmental knee arthroplasty (UKA) is being reconsidered as a viable alternative in certain cases. This study aimed to compare the risk of revision surgery between patients with rheumatic diseases undergoing primary UKA and those without rheumatic diseases.Material and methods: Data from the German Endoprosthesis Register (EPRD) were used to compare 723 cases of primary UKA in patients with rheumatic diseases (RAs) to 6,1729 cases in patients without (Non-RAs) over an 8-year period.Revisions were classified into major (revision of at least the femoral or tibial component) and minor (no bony component revision, including only insert exchange), based on the surgical and procedural codes recorded in the register.The cumulative risk of these procedures was analyzed overall and separately for septic and aseptic revisions using the Kaplan-Meier estimator. Statistical significance of differences in revision rates between RAs and Non-RAs was assessed using the Log-Rank test. Results: The cumulative risk for major revisions in RAs with primary UKA after 8 years was 9.8% (confidence interval [CI] 6.2–15.1) and in Non-RAs 7.4% (CI 7.0–7.8, p = 0.4). The cumulative risk for minor revisions in RAs after 8 years was 2.8% (CI 1.7–4.6) and in Non-RAs 1.9% (CI 1.7–2.0; p = 0.06). A trend towards higher revision rates was seen after 2 years in RAs. The analysis, stratified by septic and aseptic revisions, showed no significant differences in the risk of revision surgeries for RA compared to those without RA in aseptic major (8.8% vs. 6.9%; p = 0.5) and septic major (1.1% vs. 0.5%; p = 0.7), as well as for aseptic minor (2.4% vs. 1.5%; p = 0.07) and septic minor (0.4% vs. 0.4%; p = 0.6).Discussion and conclusions: While rheumatic diseases do not appear to impact the risk of revision surgery, a notable trend towards increased minor revisions after two years suggests ongoing monitoring is needed for long-term outcomes. 0 0 0 0