caa a22 4500 605460507 CHVBK 20210128100239.0 cr unu---uuuuu 210128e20151101xx s 000 0 eng 10.1007/s00167-014-3178-z doi (NATIONALLICENCE)springer-10.1007/s00167-014-3178-z Different femorotibial contact points between fixed- and mobile-bearing TKAs do not show clinical impact [Elektronische Daten] [R. van Stralen, P. Heesterbeek, A. Wymenga] Purpose: In anteroposterior (AP)-gliding mobile-bearing total knee arthroplasty (TKA), the femoral component can theoretically slide forward resulting in a more anterior contact point, causing pain due to impingement. A lower lever arm of the extensor apparatus can also attribute to higher patella pressures and pain. The goal of this study was to determine the contact point in a cohort of mobile- and fixed-bearing TKAs, to determine whether the contact point lies more anteriorly in mobile-bearing TKA and to confirm whether this results in anterior knee pain. Methods: We used 38 fixed-bearing TKA and 40 mobile-bearing TKA from a randomized trial with straight lateral knee X-rays and measured the contact point. The functional outcome was measured by Knee Society Score at 12months postoperatively. Pain scores were analysed using a VAS score (0-100mm) in all patients at rest and when moving. Difficulty at rising up out of a chair was also assessed using a VAS score. Results: The contact point in mobile-bearing TKA was situated at 59.5% of the AP distance of the tibia and in the fixed-bearing TKA group at 66.1% (P<0.05). Patients with mobile- and fixed-bearing TKAs had similar knee scores, pain scores and difficulty in chair rise. No significant correlation was found between contact point and knee pain. Conclusion: The hypothesis of a more anterior contact point in the mobile-bearing cohort was confirmed but no correlation with functional and pain scores in this cohort could be found. The tibiofemoral contact point could not be correlated with a different clinical outcome and higher incidence of anterior knee pain. This study further adds to the knowledge on possible differences between mobile- and fixed-bearing prostheses. Next to that, bad outcomes could not be explained by CP. Level of evidence: Case series, Level IV. Springer-Verlag Berlin Heidelberg, 2014 Mobile bearing nationallicence Fixed bearing nationallicence Total knee arthroplasty nationallicence Clinical results nationallicence Contact point nationallicence van Stralen R. Sint Maartenskliniek, Hengstdal 3, Postbus 9011, 6500 GM, Nijmegen, The Netherlands aut Heesterbeek P. Sint Maartenskliniek, Hengstdal 3, Postbus 9011, 6500 GM, Nijmegen, The Netherlands aut Wymenga A. Sint Maartenskliniek, Hengstdal 3, Postbus 9011, 6500 GM, Nijmegen, The Netherlands aut Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/11(2015-11-01), 3368-3374 0942-2056 23:11<3368 2015 23 167 https://doi.org/10.1007/s00167-014-3178-z text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00167-014-3178-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- van Stralen R. Sint Maartenskliniek, Hengstdal 3, Postbus 9011, 6500 GM, Nijmegen, The Netherlands aut NATIONALLICENCE 700 1- Heesterbeek P. Sint Maartenskliniek, Hengstdal 3, Postbus 9011, 6500 GM, Nijmegen, The Netherlands aut NATIONALLICENCE 700 1- Wymenga A. Sint Maartenskliniek, Hengstdal 3, Postbus 9011, 6500 GM, Nijmegen, The Netherlands aut NATIONALLICENCE 773 0- Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/11(2015-11-01), 3368-3374 0942-2056 23:11<3368 2015 23 167