[en] The purpose of this study is to validate a noninvasive rotational knee laxity measuring device called “Rotameter P2” with an approach based on Computed Tomography (CT). This CT-approach using X-rays is hence invasive and can be regarded as a precise reference method that may also be applied to similar devices. An error due to imperfect femur fixation was observed but can be neglected for small torques. The most significant estimation error is due to the unavoidable soft tissues rotation and hence flexibility in the measurement chain. The error increases with the applied torque.The assessment showed that the rotational knee angle measured with the Rotameter is still overestimated because of thigh and femur displacement, soft tissues deformation, and measurement artefacts adding up to a maximum of 285% error at +15Nm for the Internal Rotation of female volunteers. This may be questioned if such noninvasive devices for measuring the Tibia-Femoral Rotation (TFR) can help diagnosing knee pathologies and investigate ligament reconstructive surgery.
Research center :
University of Luxembourg: Research Unit of Engineering Sciences (RUES)
Disciplines :
Mechanical engineering
Author, co-author :
NEUMANN, Simon; University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
MAAS, Stefan ; University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
WALDMANN, Danièle ; University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
RICCI, Pierre-Louis ; University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
Zürbes, Arno; Fachhochschule Bingen
Arnoux, Pierre-Jean; Université de la Méditerranée > Laboratoire de Biomécanique Appliquée
Frédéric, Walter; Centre Hospitalier du Luxembourg > Clinique d'Eich
Jens, Kelm; Chirurgisch-Orthopädisches Zentrum - Illingen ; Klinik für Orthopädie und Orthopädische Chirurgie - Universitätsklinikum des Saarlandes
External co-authors :
yes
Language :
English
Title :
Use of a Computed Tomography Based Approach to Validate Noninvasive Devices to Measure Rotational Knee Laxity
Publication date :
2015
Journal title :
International Scholarly Research Notices
eISSN :
2356-7872
Publisher :
Hindawi Publishing Corporation, New York, United States - New York