{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,13]],"date-time":"2025-11-13T12:46:27Z","timestamp":1763037987963,"version":"build-2065373602"},"reference-count":48,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2024,3,15]],"date-time":"2024-03-15T00:00:00Z","timestamp":1710460800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Knee surg. sports traumatol. arthrosc."],"published-print":{"date-parts":[[2024,5]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Purpose<\/jats:title><jats:p>This clinical fluoroscopy study investigated knee kinematics of two different cemented fixed\u2010bearing, posterior\u2010stabilised (PS) total knee arthroplasty (TKA) designs: an asymmetric tibial component including an asymmetric insert designed to optimise personalised balance and fit and its precursor symmetrical design with symmetric insert.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>A consecutive series of patients (16 TKAs from each treatment group) participating in a randomised controlled trial comparing TKA migration was included. The exclusion criterion was the use of walking aids. Flat\u2010panel fluoroscopic recordings of step\u2010up and lunge motions were acquired 1\u2010year postoperatively. Medial and lateral contact points (CPs) were determined to calculate CP displacement, femoral axial rotation\u00a0and pivot position. Using linear mixed\u2010effects modelling techniques, kinematics between TKA designs were compared.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>During knee extension between 20\u00b0 flexion and full extension, the CPs moved anteriorly combined with a small internal femoral rotation (a screw\u2010home mechanism). Whereas CP movement was reversed: femoral rollback, external femoral rotation while flexing the knee between full extension and 20\u00b0 knee flexion, At larger flexion angles, femoral axial rotation (FAR) occurred around a lateral pivot point both during step\u2010up and lunge. The symmetric design had a 2.3\u00b0 larger range of FAR compared to the asymmetric design during lunge (<jats:italic>p<\/jats:italic>\u2009=\u20090.02). All other kinematics were comparable.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Despite the differences in design, this study showed that the asymmetric and symmetric PS TKA designs had mostly comparable knee kinematics during step\u2010up and lunge motions. It is therefore expected that the functionality of the successor TKA design is similar to that of its precursor design.<\/jats:p><\/jats:sec><jats:sec><jats:title>Level of Evidence<\/jats:title><jats:p>Level II, prospective comparative study.<\/jats:p><\/jats:sec>","DOI":"10.1002\/ksa.12125","type":"journal-article","created":{"date-parts":[[2024,3,16]],"date-time":"2024-03-16T02:16:17Z","timestamp":1710555377000},"page":"1253-1263","source":"Crossref","is-referenced-by-count":6,"title":["Knee kinematics are not different between asymmetrical and symmetrical tibial baseplates in total knee arthroplasty: A fluoroscopic analysis of step\u2010up and lunge motions"],"prefix":"10.1002","volume":"32","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5874-389X","authenticated-orcid":false,"given":"Lennard A.","family":"Koster","sequence":"first","affiliation":[{"name":"Department of Orthopaedics, Biomechanics and Imaging Group Leiden University Medical Center Leiden The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8772-9985","authenticated-orcid":false,"given":"Bart L.","family":"Kaptein","sequence":"additional","affiliation":[{"name":"Department of Orthopaedics, Biomechanics and Imaging Group Leiden University Medical Center Leiden The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0004-5939-6609","authenticated-orcid":false,"given":"Enrike H. 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