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Park DY, Park KH, Jin YJ, Yun HW, Lee JM, Chung JY, Park JY, Min BH, Lim S. Fixed-Bearing Unicompartmental Knee Arthroplasty in Tibia Vara Knees Results in Joint Surface Malalignment and Varus Joint Line Obliquity, but Does Not Affect Functional Outcomes at Greater Than 5 Years Follow-Up. J Arthroplasty 2024; 39:645-650. [PMID: 37757984 DOI: 10.1016/j.arth.2023.09.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/01/2023] [Revised: 09/10/2023] [Accepted: 09/16/2023] [Indexed: 09/29/2023] Open
Abstract
BACKGROUND This study aimed to investigate the clinical outcomes of fixed-bearing medial unicompartmental knee arthroplasty (UKA) for tibia vara knees and the associated changes in joint space malalignment (JSM) and joint line obliquity (JLO). METHODS We retrospectively analyzed a consecutive group of 100 patients who underwent fixed-bearing medial UKA with a preoperative medial proximal tibia angle (MPTA) ≥86° (n = 50) and MPTA <86° (n = 50) and who had a minimum 5-year follow-up. Radiological parameters, including the hip-knee-ankle angle, MPTA, and the postoperative JSM and JLO, were measured. Functional evaluation was performed using the range of motion, visual analog scale, Knee Society Knee Score, Knee Society Function Score, and Western Ontario and McMaster Universities Osteoarthritis Index score. RESULTS The MPTA <86° group showed significantly higher postoperative JLO (91.8 versus 90.4°, respectively; P = .002) and JSM (6.1 versus 4.2°, respectively; P = .026) compared to the MPTA ≥86° group. Functional outcomes, including range of motion, visual analog scale, Knee Society Knee Score, Knee Society Function Score, and Western Ontario and McMaster Universities Osteoarthritis Index scores, were not significantly different between the 2 groups. CONCLUSIONS Fixed-bearing medial UKA is a safe and effective surgical option for patients who have tibia vara knees, as an increase in JLO and JSM postoperatively does not have a clinically relevant impact, even after a minimum 5-year follow-up.
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Affiliation(s)
- Do Young Park
- Department of Orthopedic Surgery, School of Medicine, Ajou University, Suwon, Korea; Cell Therapy Center, Ajou University Medical Center, Suwon, Korea; Ajou University Leading Convergence of Healthcare and Medicine, Institute of Science and Technology, School of Medicine, Ajou University, Suwon, Korea
| | - Ki-Hoon Park
- Department of Orthopedic Surgery, School of Medicine, Ajou University, Suwon, Korea; Daprtment of Orthopedic Surgery, Armed Forces Yangju Medical Center, Yangju-si, Korea
| | - Yong Jun Jin
- Cell Therapy Center, Ajou University Medical Center, Suwon, Korea
| | - Hee-Woong Yun
- Department of Orthopedic Surgery, School of Medicine, Ajou University, Suwon, Korea; Cell Therapy Center, Ajou University Medical Center, Suwon, Korea
| | - Jong Min Lee
- Department of Orthopedic Surgery, School of Medicine, Ajou University, Suwon, Korea
| | - Jun Young Chung
- Department of Orthopedic Surgery, School of Medicine, Ajou University, Suwon, Korea
| | - Jae-Young Park
- Department of Orthopaedic Surgery, CHA University, CHA Bundang Medical Center, Seongnam-si, Korea
| | - Byoung-Hyun Min
- Department of Orthopedic Surgery, School of Medicine, Ajou University, Suwon, Korea; Cell Therapy Center, Ajou University Medical Center, Suwon, Korea
| | - Sumin Lim
- Department of Orthopedic Surgery, School of Medicine, Ajou University, Suwon, Korea
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