caa a22 4500 605460574 CHVBK 20210128100239.0 cr unu---uuuuu 210128e20151101xx s 000 0 eng 10.1007/s00167-014-3103-5 doi (NATIONALLICENCE)springer-10.1007/s00167-014-3103-5 External rotation of the femoral component decreases patellofemoral contact stress in total knee arthroplasty [Elektronische Daten] [Takashi Terashima, Tomohiro Onodera, Naohiro Sawaguchi, Yasuhiko Kasahara, Tokifumi Majima] Purpose: The purpose of this study was to investigate the relationship between patellofemoral (PF) contact stress in vivo and the alignment of the femoral component in patients after total knee arthroplasty (TKA). Methods: Thirty knees with medial compartment osteoarthritis that underwent mobile-bearing TKA with modified gap technique were evaluated. Surgery was performed using a subvastus approach to eliminate the effect of the approach to muscle balance, with a computed tomography-based navigation system (Vector Vision 1.61; Brain Lab, Heimstetten, Germany). PF contact stress was measured by a Flexiforce pressure sensor (Nitta Co., Ltd., Osaka, Japan) intraoperatively, and the results were compared with the alignment of the femoral component after TKA. Results: The PF contact stress was not correlated with sagittal and coronal alignment of the femoral component and patellar tracking, whereas rotational alignment of the femoral component was negatively correlated with PF contact stress (r=−0.718, p<0.01). Conclusions: Regarding the alignment of the femoral component, only the rotational alignment of the femoral component was correlated with PF contact stress. PF contact stress decreased more as the femoral component rotated more externally. Level of evidence: Case control study, Level III. Springer-Verlag Berlin Heidelberg, 2014 Total knee arthroplasty nationallicence Patellofemoral joint nationallicence Patellofemoral contact stress nationallicence Rotational alignment of the femoral component nationallicence Terashima Takashi Department of Orthopaedic Surgery, Hokkaido University Graduate School of Medicine, North 15 West 7, Kita-Ku, 060-8638, Sapporo, Japan aut Onodera Tomohiro Department of Orthopaedic Surgery, Hokkaido University Graduate School of Medicine, North 15 West 7, Kita-Ku, 060-8638, Sapporo, Japan aut Sawaguchi Naohiro Department of Orthopaedic Surgery, Hokkaido University Graduate School of Medicine, North 15 West 7, Kita-Ku, 060-8638, Sapporo, Japan aut Kasahara Yasuhiko Department of Orthopaedic Surgery, Hokkaido University Graduate School of Medicine, North 15 West 7, Kita-Ku, 060-8638, Sapporo, Japan aut Majima Tokifumi Department of Orthopedic Surgery, International University of Health and Welfare Hospital, 537-8, Iguchi, 329-2763, Nasushiobara, Japan aut Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/11(2015-11-01), 3266-3272 0942-2056 23:11<3266 2015 23 167 https://doi.org/10.1007/s00167-014-3103-5 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/s00167-014-3103-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Terashima Takashi Department of Orthopaedic Surgery, Hokkaido University Graduate School of Medicine, North 15 West 7, Kita-Ku, 060-8638, Sapporo, Japan aut NATIONALLICENCE 700 1- Onodera Tomohiro Department of Orthopaedic Surgery, Hokkaido University Graduate School of Medicine, North 15 West 7, Kita-Ku, 060-8638, Sapporo, Japan aut NATIONALLICENCE 700 1- Sawaguchi Naohiro Department of Orthopaedic Surgery, Hokkaido University Graduate School of Medicine, North 15 West 7, Kita-Ku, 060-8638, Sapporo, Japan aut NATIONALLICENCE 700 1- Kasahara Yasuhiko Department of Orthopaedic Surgery, Hokkaido University Graduate School of Medicine, North 15 West 7, Kita-Ku, 060-8638, Sapporo, Japan aut NATIONALLICENCE 700 1- Majima Tokifumi Department of Orthopedic Surgery, International University of Health and Welfare Hospital, 537-8, Iguchi, 329-2763, Nasushiobara, Japan aut NATIONALLICENCE 773 0- Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/11(2015-11-01), 3266-3272 0942-2056 23:11<3266 2015 23 167