Use of Image Free Robotic-Assisted System for Total Knee Arthroplasty Associated with Improved Knee Society Function Score Compared to Manual Instrumentation, A Retrospective Multi-center Study

摘要

Robotic-Assistance (RA) in total knee arthroplasty (TKA) has gained popularity due to its ability to improve accuracy and facilitate patient specific techniques. However, the reported influence on clinical outcomes is inconsistent. This study assessed the influence of the recently introduced VELYS Robotic-Assisted Solution on the Knee Society Function Score (KSFS) at early follow up. A retrospective review of a prospective company sponsored registry was conducted to assess KSFS at first post-operative follow up for all ATTUNE primary TKAs. RA-TKAs were differentiated from MI-TKA. The mean KSFS was compared between groups. Pre-operative demographic information including sex, age, BMI and pre-operative KSFS scores were compared and an ANCOVA was used on post-operative KSFS scores to account for any differences. There were 553 RA-TKAs and 6,710 MI-TKAs with KSFS reported at first post-operative follow-up. The proportion of females was similar between the groups but the RA-TKA group was older (69.37 Vs. 66.37, p<0.0001), had slightly lower BMI (29.90 Vs. 30.79, p<0.0001) and had post-operative follow up at an earlier time point (87.43 Vs. 116 days, p<0.0001). The mean post-operative KSFS was significantly higher for the RA-TKA group than the MI-TKA group (79.59 Vs. 76.44, p=0.0001 and 78.15 Vs. 74.05 following ANCOVA adjustment). In this study, KSFS was improved for RA compared to MI at first follow-up. These findings suggest that RA combined with patient specific techniques can improve patient outcomes. Further investigation with longer-term follow-up is required.