caa a22 4500 60545650X CHVBK 20210128100218.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s00167-014-2892-x doi (NATIONALLICENCE)springer-10.1007/s00167-014-2892-x Similar stability and range of motion between cruciate-retaining and cruciate-substituting ultracongruent insert total knee arthroplasty [Elektronische Daten] [Jörg Lützner, F.-P. Firmbach, C. Lützner, J. Dexel, S. Kirschner] Purpose: The use of an ultracongruent (UC) insert with a standard femoral component for substitution of the posterior cruciate ligament (PCL) is a bone-preserving and therefore interesting alternative to the established box and cam mechanism of posterior-stabilized total knee arthroplasty (TKA). Despite the regular use of these UC inserts, there is little evidence about stability and range of motion (ROM). Methods: The aim of this study was to evaluate the stability and ROM in standard cruciate-retaining (CR) and cruciate-substituting UC inserts of the same TKA. In 39 patients, intraoperative measurements of stability and ROM were taken (1) before soft tissue release and bone cuts, (2) after implantation of a CR TKA and (3) after resection of the PCL and substitution with an UC insert. All measurements were taken using a navigation system. Results: Stability measurements demonstrated no differences between CR (PCL intact) and UC TKA (PCL resected), but significantly increased anteroposterior translation at 60° and 90° of knee flexion compared with the preoperative condition. ROM measurements demonstrated improvement of knee flexion from preoperatively mean 105° (SD 14.1°) to intraoperative 120.2° (SD 6.7°) with the CR and 121.0° (SD 7.5°) with the UC insert and 113.5° (SD 14.0°) at the 1-year follow-up. Conclusion: This study demonstrates similar stability of an UC insert compared with a standard CR insert. UC inserts are therefore a bone-preserving solution if the PCL needs to be substituted. ROM was not improved after resection of the PCL and substitution with the UC insert. Level of evidence: II. Springer-Verlag Berlin Heidelberg, 2014 TKA nationallicence TKR nationallicence Ultracongruent insert nationallicence UC insert nationallicence Stability nationallicence Range of motion nationallicence Results nationallicence Lützner Jörg Department of Orthopaedic Surgery, Medical Faculty, University Hospital Carl Gustav Carus, TU Dresden, Fetscherstr. 74, 01307, Dresden, Germany aut Firmbach F.-P Aesculap AG, Tuttlingen, Germany aut Lützner C. Department of Orthopaedic Surgery, Medical Faculty, University Hospital Carl Gustav Carus, TU Dresden, Fetscherstr. 74, 01307, Dresden, Germany aut Dexel J. Department of Orthopaedic Surgery, Medical Faculty, University Hospital Carl Gustav Carus, TU Dresden, Fetscherstr. 74, 01307, Dresden, Germany aut Kirschner S. Department of Orthopaedic Surgery, Medical Faculty, University Hospital Carl Gustav Carus, TU Dresden, Fetscherstr. 74, 01307, Dresden, Germany aut Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/6(2015-06-01), 1638-1643 0942-2056 23:6<1638 2015 23 167 https://doi.org/10.1007/s00167-014-2892-x 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/s00167-014-2892-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lützner Jörg Department of Orthopaedic Surgery, Medical Faculty, University Hospital Carl Gustav Carus, TU Dresden, Fetscherstr. 74, 01307, Dresden, Germany aut NATIONALLICENCE 700 1- Firmbach F.-P Aesculap AG, Tuttlingen, Germany aut NATIONALLICENCE 700 1- Lützner C. Department of Orthopaedic Surgery, Medical Faculty, University Hospital Carl Gustav Carus, TU Dresden, Fetscherstr. 74, 01307, Dresden, Germany aut NATIONALLICENCE 700 1- Dexel J. Department of Orthopaedic Surgery, Medical Faculty, University Hospital Carl Gustav Carus, TU Dresden, Fetscherstr. 74, 01307, Dresden, Germany aut NATIONALLICENCE 700 1- Kirschner S. Department of Orthopaedic Surgery, Medical Faculty, University Hospital Carl Gustav Carus, TU Dresden, Fetscherstr. 74, 01307, Dresden, Germany aut NATIONALLICENCE 773 0- Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/6(2015-06-01), 1638-1643 0942-2056 23:6<1638 2015 23 167