Using at least 20% medial unicompartmental knee arthroplasty is associated with improved patient‐reported outcome measures across all knee arthroplasty patients.

Purpose Methods Results Conclusion Level of Evidence To investigate the impact of orthopaedic surgeons' arthroplasty distributions on patient‐reported outcome measures (PROMs) following knee arthroplasty, thus addressing the gap in knowledge regarding the optimal distribution of arthroplasties.2256 knee arthroplasties were included (total knee arthroplasty [TKA] or unicompartmental knee arthroplasty [UKA]). All were conducted at a single centre between August 2016 and August 2022 with a minimum of 1‐year follow‐up. The Oxford Knee Score (OKS), the Forgotten Joint Score (FJS) and the Activity and Participation Questionnaire (APQ) were assessed preoperatively, and at 3 and 12 months postoperatively. Patients were categorized based on the surgeons' yearly surgeries: (1) TKA only, (2) TKA+ <20% medial UKA, (3) TKA+ ≥20% medial UKA and (4) TKA+ ≥20% medial UKA + lateral UKA + patellofemoral UKA. Linear regression models adjusted for demographic variables and preoperative PROM scores were used to estimate changes in mean PROM scores.Group 4 showed significantly higher improvements in PROM scores at 3 and 12 months compared to Group 1. In the 12‐month adjusted analysis, Group 4 had 1.9 points (95% confidence interval [CI]: 1.0–2.8) higher OKS‐, 7.0 points (95% CI: 3.9–10.2) higher FJS‐ and 8.3 points (95% CI: 4.8–11.8) higher APQ‐change than Group 1. There were no significant differences between Groups 1 and 2, nor any clinically relevant differences between Groups 3 and 4. Additionally, the percentage of patients who achieved excellent OKS (>41) was significantly higher in Groups 3 + 4 compared to Groups 1 + 2 (<italic>p</italic> < 0.001).Despite limitations, the findings of this study suggest that utilizing ≥20% medial UKA leads to greater postoperative improvements in PROM across all treated knee arthroplasty patients.Level III. [ABSTRACT FROM AUTHOR]