The outcomes of mobile bearing unicompartmental knee arthroplasty and total knee arthroplasty on anteromedial osteoarthr
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KNEE ARTHROPLASTY
The outcomes of mobile bearing unicompartmental knee arthroplasty and total knee arthroplasty on anteromedial osteoarthritis of the knee in the same patient Boonchana Pongcharoen1 · Jitisak Timjang1 Received: 19 March 2019 / Accepted: 14 July 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Introduction Compared to total knee arthroplasty (TKA), mobile-bearing unicompartmental knee arthroplasty (UKA) is associated with better outcomes, such as an earlier recovery, less postoperative pain, lower morbidity and mortality, and a greater “feel” of a normal knee. However, no study has reported the clinical outcomes in patients with the same stage of osteoarthritis of the knee. The purpose of this study was to determine the clinical outcomes, including the Joint Forgotten Score (JFS), Oxford Knee Score (OKS), Knee Society Score (KSS), Knee Injury and Osteoarthritis Outcome Score (KOOS), and Kujala score after UKA on one knee and TKA on the opposite knee in the same patient. Materials and methods We retrospectively reviewed 32 patients with anteromedial OA who underwent mobile-bearing UKA in one knee and TKA in the other knee from 2009 to 2017. The JFS, OKS, KSS, KOOS, and Kujala scores were recorded and compared between the groups. Patients’ preferences between UKA and TKA and satisfaction were also recorded. Results The JFS and KOOS in the UKA group were significantly (p = 0.01, 0.01) higher than those in the TKA group: 97.01 ± 3.26 (89.58–100) vs. 94.92 ± 3.34 (87.80–100) and 91.16 ± 2.67 (85.25–96) vs. 89.24 ± 2.67 (84.50–94.71), respectively. The OKS, KSS, and Kujala scores were not different between the two groups (p = 0.82, 0.95, and 0.31, respectively) and neither was patient preference (p = 0.41) or satisfaction (p = 0.42). The mean follow-up was 48.36 months (range 24.00– 96.00 months), during which there were no postoperative complications. Conclusion UKA was associated with a better JFS and KOOS but was otherwise comparable to TKA and may be preferable. Keywords Patient-reported outcome measures · Oxford UKA · Anteromedial knee OA · Total knee arthroplasty
Introduction Anteromedial osteoarthritis (AMOA) of the knee is an indication for mobile-bearing unicompartmental knee arthroplasty (UKA) [1], which is associated with good clinical outcomes and survival [1–6]; survival rates of 98% and 95% over 10 and 20 years, respectively, have been reported [1, 2]. Total knee arthroplasty (TKA) has also shown good clinical outcomes and survival for medial OA or AMOA and for tricompartmental OA of the knee [7–12]. However, UKA is associated with an earlier recovery, less postoperative pain, a * Boonchana Pongcharoen [email protected] 1
Department of Orthopaedic Surgery, Thammasat University, 95 Moo 8, Paholyotin Road, Khlong Nueng, Khlong Luang, Pathumthani 12120, Thailand
higher activity level, a higher quality of life, a greater range of motion, and lower morbidity and mortality, and patients report that UKA feels more like a normal knee than TKA [13–21]. Ho
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