Table of Contents
ISRN Orthopedics
Volume 2013, Article ID 387620, 10 pages
Research Article

Static and Dynamic Differences in Fixation Stability between a Spacer Plate and a Small Stature Plate Fixator Used for High Tibial Osteotomies: A Biomechanical Bone Composite Study

1Faculty of Science, Technology and Communication, University of Luxembourg, 6 rue R. Coudenhove-Kalergi, 1359 Luxembourg, Luxembourg
2Department of Orthopedic Surgery, Centre Hospitalier de Luxembourg, 78 rue d’Eich, 1460 Luxembourg, Luxembourg
3Sports Medicine Research Laboratory, Public Research Centre for Health, Centre Médical de la Fondation Norbert Metz, 76 rue d’Eich, 1460 Luxembourg, Luxembourg

Received 24 June 2013; Accepted 13 August 2013

Academic Editors: C.-H. Lee, G. Papachristou, H.-R. Song, and B. K. Weiner

Copyright © 2013 Stefan Maas et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Background. The objective of the present study was to compare mechanical strength and stability of the newly designed spacer plate with the gold standard plate for the treatment of medial knee joint osteoarthritis. Materials and Methods. Ten fourth-generation tibial bone composites underwent a medial open-wedge high tibial osteotomy (HTO) according to standard techniques, using five TomoFix plates and five Contour Lock plates. Static compression load to failure and load-controlled cyclical fatigue failure tests were performed. Forces and horizontal displacements were measured; plastic deformations and dynamic stiffness were determined. Results and Discussion. In all samples, rotation of the tibial head and fracture of the opposite cortex were observed. Behaviors of the specimens under static loading were comparable between groups. Cyclic testing revealed lateral significant higher stiffness until failure for the Contour Lock compared to the TomoFix plate. No visible implant failure was observed in any group. Conclusion. Considering the static analysis, both plates offered sufficient stability under physiologic loads of up to 3000 N. The Contour Lock plate-fixated specimens showed a higher stability during the cyclic testing, supposedly due to the wider distance between the fixation screws.