caa a22 4500 605456240 CHVBK 20210128100216.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s00167-014-3488-1 doi (NATIONALLICENCE)springer-10.1007/s00167-014-3488-1 Isolated popliteus tendon injury does not lead to abnormal laxity in posterior-stabilised total knee arthroplasty [Elektronische Daten] [K. Ghosh, N. Hunt, A. Blain, K. Athwal, L. Longstaff, A. Amis, S. Rushton, D. Deehan] Purpose: The popliteus tendon is crucial to postero-lateral stability and prone to iatrogenic injury intra-operatively. Its role in the stability of the replaced knee remains contentious. The aim of this study was to use computer navigation to quantify the effect of popliteus sectioning on the ‘envelope of laxity' (EoL) offered by a posterior-stabilised (PS) total knee arthroplasty (TKA) and compare with that of the native knee. Methods: Loaded cadaveric legs were mounted on a purpose built rig. EoL was measured in 3 degrees of freedom using computer navigation. Knees were subjectively stressed in varus/valgus, internal/external rotation and anterior draw. This was performed preoperatively, during TKA and after sectioning of the popliteus tendon. Real-time data were recorded at 0°, 30°, 60° and 90° of flexion as the operating surgeon stressed the knee in 3 degrees of freedom to its subjective endpoint. Mixed-effect modelling was used to quantify the effects of intervention on degree of laxity. Results: In all conditions, there was an increase in laxity with knee flexion. Insertion of a PS TKA resulted in increased constraint, particularly in rotation. Sectioning of the popliteus did not result in a significant increase in knee laxity to 90º of knee flexion. However, at deeper flexion angles, tendon sectioning overcame the constraints of the implant resulting in a significant increase in rotatory and varus/valgus laxity towards the native condition. Conclusion: These findings support the view that certain current designs of PS knee replacement can constrain the knee in flexion in the absence of postero-lateral deficiency. For this implant, isolated sectioning of the popliteus tendon did not substantially generate abnormal knee laxity. European Society of Sports Traumatology, Knee Surgery, Arthroscopy (ESSKA), 2014 Knee replacement nationallicence Navigation nationallicence Biomechanics nationallicence Stability nationallicence Popliteus tendon nationallicence Ghosh K. Freeman Hospital, NE7 7DN, High Heaton, Newcastle upon Tyne, UK aut Hunt N. Institute of Cellular Medicine, Framlington Place, University of Newcastle, NE2 4HH, Newcastle upon Tyne, UK aut Blain A. School of Biology, Newcastle University, NE1 7RU, Newcastle upon Tyne, UK aut Athwal K. Biomechanics, Mechanical Engineering, Imperial College London, SW7 2AZ, London, UK aut Longstaff L. University Hospital of North Durham, North Road, DH1 5TW, County Durham, UK aut Amis A. Biomechanics, Mechanical Engineering, Imperial College London, SW7 2AZ, London, UK aut Rushton S. School of Biology, Newcastle University, NE1 7RU, Newcastle upon Tyne, UK aut Deehan D. Freeman Hospital, NE7 7DN, High Heaton, Newcastle upon Tyne, UK aut Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/6(2015-06-01), 1763-1769 0942-2056 23:6<1763 2015 23 167 https://doi.org/10.1007/s00167-014-3488-1 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/s00167-014-3488-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ghosh K. Freeman Hospital, NE7 7DN, High Heaton, Newcastle upon Tyne, UK aut NATIONALLICENCE 700 1- Hunt N. Institute of Cellular Medicine, Framlington Place, University of Newcastle, NE2 4HH, Newcastle upon Tyne, UK aut NATIONALLICENCE 700 1- Blain A. School of Biology, Newcastle University, NE1 7RU, Newcastle upon Tyne, UK aut NATIONALLICENCE 700 1- Athwal K. Biomechanics, Mechanical Engineering, Imperial College London, SW7 2AZ, London, UK aut NATIONALLICENCE 700 1- Longstaff L. University Hospital of North Durham, North Road, DH1 5TW, County Durham, UK aut NATIONALLICENCE 700 1- Amis A. Biomechanics, Mechanical Engineering, Imperial College London, SW7 2AZ, London, UK aut NATIONALLICENCE 700 1- Rushton S. School of Biology, Newcastle University, NE1 7RU, Newcastle upon Tyne, UK aut NATIONALLICENCE 700 1- Deehan D. Freeman Hospital, NE7 7DN, High Heaton, Newcastle upon Tyne, UK aut NATIONALLICENCE 773 0- Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/6(2015-06-01), 1763-1769 0942-2056 23:6<1763 2015 23 167