Article (Scientific journals)
Biomechanik neuer Implantate für die HTO
Pape, Dietrich; DIFFO KAZE, Arnaud; Hoffmann, Alexander et al.
2017In Orthopade (Der), 46 (7), p. 583-595
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Keywords :
High tibial osteotomy; Osteoarthritis; Tibial head; Bone plates; Implant
Abstract :
[en] Biomechanical characteristics of 5 tibial osteotomy plates for the treatment of medial knee joint osteoarthritis were examined. Fourth-generation tibial bone composites underwent a medial open-wedge high tibial osteotomy, using TomoFix™ standard, PEEKPower®, ContourLock®, TomoFix™ small stature plates, and iBalance® implants. Static compression load to failure and load-controlled cyclic fatigue failure tests were performed. All plates had sufficient stability up to 2400 N in the static compression load to failure tests. Screw breakage in the iBalance® group and opposite cortex fractures in all constructs occurred at lower loading conditions. The highest fatigue strength in terms of maximal load and number of cycles performed prior to failure was observed for the ContourLock® group followed by the iBalance® implants, the TomoFix™ standard and small stature plates. PEEKPower® had the lowest fatigue strength. All plates showed sufficient stability under static loading. Compared to the TomoFix™ and the PEEKPower® plates, the ContourLock® plate and iBalance® implant showed a higher mechanical fatigue strength during cyclic fatigue testing, suggesting that both mechanical static and fatigue strength increase with a wider proximal T‑shaped plate design together with diverging proximal screws. Mechanical strength of the bone–implant constructs decreases with a narrow T‑shaped proximal end design and converging proximal screws (TomoFix™) or a short vertical plate design (PEEKPower®). Published results indicate high fusion rates and good clinical results with the TomoFix™ plate, which is contrary to our findings. A certain amount of interfragmentary motion rather than high mechanical strength and stiffness seem to be important for bone healing which is outside the scope of this paper.
Disciplines :
Engineering, computing & technology: Multidisciplinary, general & others
Author, co-author :
Pape, Dietrich;  Centre Hospitalier de Luxembourg > Orthopedie
DIFFO KAZE, Arnaud ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit ; Centre Hospitalier Hospitalier de Luxembourg- CHL > Orthopédie > Orthopédie
Hoffmann, Alexander;  Centre Hospitalier de Luxembourg - CHL > Orthopédie > Orthopédie
MAAS, Stefan ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
External co-authors :
no
Language :
German
Title :
Biomechanik neuer Implantate für die HTO
Alternative titles :
[en] Biomechanics of new implants for HTO
Publication date :
July 2017
Journal title :
Orthopade (Der)
ISSN :
1433-0431
Publisher :
Springer, Germany
Volume :
46
Issue :
7
Pages :
583-595
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBilu :
since 08 November 2017

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