J Arthroplasty. 2023 Jun 2:S0883-5403(23)00570-3. doi: 10.1016/j.arth.2023.05.046. Online ahead of print.
ABSTRACT
BACKGROUND: The purpose of this study was to retrospectively examine the relationship between pre- and post-operative alignment in robotic unicompartmental knee arthroplasty and postoperative patient-reported outcome measures.
METHODS: A retrospective review of 374 patients who underwent robotic-assisted UKA was conducted. Patient demographics, history, and pre- and post-operative Knee Injury and Osteoarthritis Outcome Score for Joint Replacement (KOOS-JR) scores were obtained via chart review. Average follow-up period was 2.4 years (range: 0.4-4.5 years) to chart review and 9.5 months (range: 6-48 months) to latest KOOS-JR. Pre- and post-operative robotically-measured knee alignment was obtained from operative reports. Incidence of conversion to total knee arthroplasty was determined by review of a health information exchange tool.
RESULTS: Multivariate regressions showed no statistically significant relationship between preoperative alignment, postoperative alignment, or degrees of alignment correction and change in KOOS-JR score or achievement of KOOS-JR MCID (P > 0.05). Patients who had > 8 degrees of postoperative varus alignment had on average a 20% lower achievement of KOOS-JR MCID compared to patients who had < 8 degrees of postoperative varus alignment; however, this difference was not statistically significant (P > 0.05). There were three patients who required conversion to total knee arthroplasty in the follow-up period, with no significant relationship to alignment variables (P > 0.05).
CONCLUSION: There was no significant difference in KOOS-JR change for those patients who had a larger or smaller degree of deformity correction, and correction did not predict MCID achievement. The results of this study contributes to the ongoing discussion of expanding indications for UKAs.
PMID:37271235 | DOI:10.1016/j.arth.2023.05.046
