caa a22 4500 605456267 CHVBK 20210128100216.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s00167-014-3122-2 doi (NATIONALLICENCE)springer-10.1007/s00167-014-3122-2 Does knee stability in the coronal plane in extension affect function and outcome after total knee arthroplasty? [Elektronische Daten] [Hiroyuki Nakahara, Ken Okazaki, Satoshi Hamai, Shigetoshi Okamoto, Umito Kuwashima, Hidehiko Higaki, Yukihide Iwamoto] Purpose: The aim of the present study was to clarify whether varus-valgus laxities under static stress in extension, femoral condylar lift-off during walking, and patient-reported outcomes after total knee arthroplasty (TKA) were correlated with each other. Methods: Ninety-four knees, which had undergone posterior-stabilized TKA, were analysed. The varus-valgus laxity during knee extension was measured using a stress radiograph. New Knee Society Score (KSS) questionnaires were mailed to all patients. Correlations between the values of stress radiographs and KSS were analysed. Additionally, continuous radiological images were taken of 15 patients while each walked on a treadmill to determine condylar lift-off from the tibial tray using a 3D-to-2D image-to-model registration technique. Correlations between the amount of lift-off and either the stress radiograph or the KSS were also analyzed. Results: The mean angle measured was 5.9±2.7° with varus stress and 5.0±1.6° with valgus stress. The difference between them was 0.9±2.8°. Varus-valgus laxities, or the differences between them, did not show any statistically significant correlation with either component of the KSS (p>0.05). The average amount of femoral condylar lift-off during walking was 1.4±0.8mm (medial side) and 1.3±0.6mm (lateral side). The amount of lift-off did not correlate with either varus-valgus laxities or the KSS (p>0.05). Conclusions: No correlations were found among varus-valgus laxities under static stress in extension, femoral condylar lift-off during walking, or patient-reported outcomes after well-aligned TKA. This study suggests that small variations in coronal laxities do not influence lift-off during walking and the patient-reported outcomes. Level of evidence: IV. Springer-Verlag Berlin Heidelberg, 2014 Total knee arthroplasty nationallicence Coronal laxity nationallicence Lift-off nationallicence Walking nationallicence Patient-reported outcome nationallicence Nakahara Hiroyuki Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, 812-8582, Fukuoka, Japan aut Okazaki Ken Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, 812-8582, Fukuoka, Japan aut Hamai Satoshi Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, 812-8582, Fukuoka, Japan aut Okamoto Shigetoshi Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, 812-8582, Fukuoka, Japan aut Kuwashima Umito Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, 812-8582, Fukuoka, Japan aut Higaki Hidehiko Department of Biorobotics, Faculty of Engineering, Kyushu Sangyo University, Fukuoka, Japan aut Iwamoto Yukihide Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, 812-8582, Fukuoka, Japan aut Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/6(2015-06-01), 1693-1698 0942-2056 23:6<1693 2015 23 167 https://doi.org/10.1007/s00167-014-3122-2 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/s00167-014-3122-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Nakahara Hiroyuki Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, 812-8582, Fukuoka, Japan aut NATIONALLICENCE 700 1- Okazaki Ken Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, 812-8582, Fukuoka, Japan aut NATIONALLICENCE 700 1- Hamai Satoshi Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, 812-8582, Fukuoka, Japan aut NATIONALLICENCE 700 1- Okamoto Shigetoshi Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, 812-8582, Fukuoka, Japan aut NATIONALLICENCE 700 1- Kuwashima Umito Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, 812-8582, Fukuoka, Japan aut NATIONALLICENCE 700 1- Higaki Hidehiko Department of Biorobotics, Faculty of Engineering, Kyushu Sangyo University, Fukuoka, Japan aut NATIONALLICENCE 700 1- Iwamoto Yukihide Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, 812-8582, Fukuoka, Japan aut NATIONALLICENCE 773 0- Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/6(2015-06-01), 1693-1698 0942-2056 23:6<1693 2015 23 167