Unicompartmental Knee Arthroplasty Patients Have Lower Joint Awareness and Higher Function at 5 Years Compared to Total Knee Arthroplasties: A Matched Comparison |
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| Affiliation: | 1. Department of Orthopedic Surgery, Hospital for Special Surgery, New York, New York;2. Adult Reconstruction and Joint Replacement Service, Hospital for Special Surgery, New York, New York;3. University of Maryland School of Medicine, Baltimore, Maryland;4. Biostatistics Core, Research Administration, Hospital for Special Surgery, New York, New York;1. Department of Orthopedics, Orthopedic Research Institute, West China Hospital, West China School of Medicine, Sichuan University, Chengdu, China;2. Department of Orthopedic Surgery, Peking Union Medical College Hospital, Beijing, China;3. Department of Orthopedic Surgery, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China;4. School of Life Sciences, Tsinghua University, Beijing, China;5. Institute of Biomedical and Health Engineering (iBHE), Tsinghua Shenzhen International Graduate School, Shenzhen, China;6. Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, China;7. Longwood Valley, Beijing, China;8. School of Medicine, Tsinghua University, Beijing, China;1. Luminis Health Orthopedics, Anne Arundel Medical Center, Annapolis, Maryland;2. Campbell University School of Osteopathic Medicine, Lillington, North Carolina;1. Rothman Orthopaedic Institute at Thomas Jefferson University, Philadelphia, Pennsylvania;2. Department of Orthopaedics & Sports Medicine, Maine Medical Partners, South Portland, Maine;3. OrthoCarolina, Charlotte, North Carolina;4. American Association of Hip and Knee Surgeons, Chicago, Illinois;1. Department of Orthopedic Surgery, Biomedical Research Institute, Pusan National University Hospital, Pusan National University School of Medicine, Busan, South Korea;2. Division of Biostatistics, Research Institute for Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital, Pusan National University School of Medicine, Yangsan, South Korea;3. Department of Orthopedic Surgery, Research Institute for Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital, Pusan National University School of Medicine, Yangsan, South Korea |
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| Abstract: | BackgroundThe purpose of this study was to evaluate postoperative outcomes at minimum 5-year follow-up in patients following unicompartmental knee arthroplasty (UKA) compared to a matched cohort of total knee arthroplasty (TKA) patients.MethodsPatients who had primarily medial compartment osteoarthritis (OA) who met criteria for medial UKA underwent TKA or medial UKA between 2014 and 2015 at a single institution, matched for age, sex, and body mass index. There were 127 UKAs in 120 patients and 118 TKAs in 116 patients included with minimum 5-year follow-up (range, 6 to 8). Mean age was 69 years (range, 59 to 79) and 71 years (range, 62 to 80) in the UKA and TKA groups, respectively (P = .049).ResultsPatients who underwent UKA had significantly higher mean (±SD) Forgotten Joint Scores (87 ± 20 versus 59 ± 34, P < .001); higher Knee Society Scores (88 ± 14 versus 75 ± 21, P < .001); and lower Numeric Pain Rating Scores (0.8 ± 1.6 versus 1.9 ± 2.2, P < .001). Survivorship free from all-cause revision was 96% (95% CI = 93%-99%) and 99% (95% CI = 97%-100%) at 5 years for TKA and UKA, respectively (P = .52). There were 8 both component revisions in the TKA group within 5 years from the date of surgery and 2 UKA conversions to TKA after 5-year follow-up.ConclusionPatients who have medial compartment OA and underwent UKA had significantly lower joint awareness, decreased pain, improved function, and higher satisfaction compared to matched TKA patients at minimum 5-year follow-up while maintaining excellent survivorship. |
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| Keywords: | unicompartmental arthroplasty total knee arthroplasty mid-term follow-up forgotten joint postoperative outcomes |
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