The effect of component alignment on clinical outcomes in fixed bearing unicompartmental knee arthroplasty |
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| Institution: | 1. Department of Trauma and Orthopaedics, West Suffolk NHS Foundation Trust, Hardwick Lane, Bury St Edmunds, Suffolk IP33 2QZ, United Kingdom;2. University of Edinburgh, Edinburgh, United Kingdom;1. Department of Clinical Medicine, Aarhus University, Aarhus, Denmark;2. AutoRSA Research Group, Orthopaedic Research Unit, Aarhus University Hospital, Aarhus, Denmark;3. Department of Orthopeadics, University Clinic for Hand, Hip and Knee Surgery, Hospital Unit West, Holstebro, Denmark;4. Department of Orthopedics, Aarhus University Hospital, Aarhus, Denmark;1. Department of Orthopaedics, Vanderbilt University Medical Center, 1215 21st Avenue South, 4200 Medical Center East, Nashville, TN 37232-8774, United States;2. Attending Orthopaedic Surgeon, Kerlan Jobe Institute, 6801 Park Terrace, Los Angeles, CA 90045, United States;3. Department of Orthopaedics, Rush University Medical Center, 1611 W Harrison, Suite 300, Chicago, IL 60612, United States;4. Attending Orthopaedic Surgeon, Kerlan Jobe Institute, 6801 Park Terrace, Los Angeles, CA 90045, United States;1. Department of Orthopaedic Surgery, Centre of Head and Orthopaedics, Rigshospitalet, 2100 Copenhagen Ø, Denmark;2. Department of Orthopaedic Surgery, Clinic of Hip, Knee and Foot Surgery, Gentofte and Herlev Hospital, 2900 Hellerup, Denmark;3. Clinical Sciences, Lund University, Department of Orthopaedics, Skåne University Hospital, 221 85 Lund, Sweden;4. Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Denmark;1. Department of Orthopaedic Surgery, Tokyo Women’s Medical University, 8-1 Kawada-cho, Shinjuku-ku, Tokyo 162-8666, Japan;2. Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, 3-1-1, Maidashi, Higashi-ku, Fukuoka 812-8582, Japan;3. Department of Orthopaedic Surgery, Japan Community Health Care Organization, Kyushu Hospital, 1-8-1 Kishinoura, Yahatanishi-ku, Kitakyushu 806-8501, Japan;1. Department of Orthopedics, University of Ulm, Ulm, Germany;2. Karl-Olga Hospital Stuttgart, Department of Orthopedics, Hackstraße 61, 70190 Stuttgart, Germany;1. Department of Orthopaedic Surgery, Hyogo College of Medicine, Japan;2. Department of Orthopaedic Surgery, Nishinomiya Kaisei Hospital, Japan;3. Diakonie Klinikum Jung-Stilling, Siegen, Germany |
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| Abstract: | BackgroundThe aim of this study is to report component alignment in a series of ZUK fixed bearing unicompartmental knee arthroplasty (UKA) implants and compare this to clinical outcomes.MethodsThe radiographs, Knee Society Scores (KSS) and knee flexion of 223 medial UKAs were evaluated. The following alignment parameters were assessed; coronal and sagittal femoral component angle (c-FCA and s-FCA), coronal and sagittal tibia component angle (c-TCA and s-TCA) and the coronal tibiofemoral angle (c-TFA). Each alignment parameter was grouped at consecutive 2.5° intervals, mean KSS and knee flexion was then compared between the interval groups.Results96.4% of femoral components were between 7.5° of varus and valgus and 95.1% between 7.5° extension and 5° flexion. 89.6% of tibial components were between 7.5° of varus and 2.5° valgus and 97.3% between 2.5° and 15° flexion. There was no significant difference between the KSS or knee flexion between any of the incremental groups of component alignment. Mean c-TFA was 0.2 ± 3.0°, 92.4% were between ?5° (varus) and 5° (valgus). KSS were significantly greater for two of the increments with slightly more varus. Linear regression analysis showed there was very weak correlation (R2 = 0.1933) between c-TFA and c-TCA.ConclusionsThe results of this study show that fixed bearing UKA components are forgiving to accommodate some variation in tibial and femoral component position without effecting clinical outcome scores or knee flexion. Limb alignment matters more than component position and knees with slight varus tibiofemoral alignment have better clinical scores than those with valgus. |
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| Keywords: | UKA Unicondylar Alignment ZUK Fixed bearing |
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