Postoperative patient-reported outcomes after revision total knee arthroplasty: Propensity-score-matched comparison with primary total knee arthroplasty

Abstract Background: Total knee arthroplasty (TKA) is being increasingly performed owing to its favorable long-term survival rate; consequently, the rate of revision TKA has also increased. There are few reports on patient-reported outcomes following revision TKA compared with matched cohorts following primary TKA. Methods: Using propensity-score matching based on age at the time of the survey, sex, and primary disease, a 1:2 matched cohort was used to compare the Knee Society Score (KSS)-2011, joint perception, EuroQol 5-Dimension (EQ-5D) score, and surgical satisfaction between patients who underwent primary and revision TKA. Results: Twenty patients (20 knees) who underwent revision TKA were matched with 40 patients (40 knees) who underwent primary TKA. The KSS-2011 total score, joint perception, and EQ-5D scores were significantly lower following revision TKA (approximately 74%, 79%, and 79%, respectively) than those following primary TKA. The expectation category of KSS-2011 and surgical satisfaction were not significantly different between the groups. Infection and rotating-hinge knee were significant factors of lower KSS-2011 scores following revision TKA. Conclusions: Compared with primary TKA, although knee joint function and quality of life may decrease, especially due to infection and the need for rotating hinge knee, the fulfillment of expectations and surgical satisfaction can be achieved even after revision TKA.