Force-controlled dynamic wear testing of total ankle replacements

Currently, our knowledge of wear performance in total ankle replacements is limited. The aim of this study is to develop a scenario for force-controlled testing and wear testing of total ankle replacements. A force-controlled wear test was developed: based on cadaver measurements, the passive stabil...

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Hauptverfasser: Reinders, Jörn (VerfasserIn) , Stillfried, Falko von (VerfasserIn) , Altan, Emel (VerfasserIn) , Sonntag, Robert (VerfasserIn) , Heitzmann, Daniel (VerfasserIn) , Kretzer, Jan Philippe (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 15 January 2015
In: Acta biomaterialia
Year: 2015, Jahrgang: 12, Pages: 332-340
ISSN:1878-7568
DOI:10.1016/j.actbio.2014.10.036
Online-Zugang:Verlag, Volltext: http://dx.doi.org/10.1016/j.actbio.2014.10.036
Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S1742706114004875
Volltext
Verfasserangaben:Jörn Reinders, Falko von Stillfried, Emel Altan, Robert Sonntag, Daniel W.W. Heitzmann, Jan Philippe Kretzer

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520 |a Currently, our knowledge of wear performance in total ankle replacements is limited. The aim of this study is to develop a scenario for force-controlled testing and wear testing of total ankle replacements. A force-controlled wear test was developed: based on cadaver measurements, the passive stabilization (ligaments and soft tissue) of the ankle joint was characterized and a restraint model for ankle stabilization was developed. Kinematics and kinetics acting at the replaced ankle joint were defined based on literature data and gait analysis. Afterwards, force-controlled wear testing was carried out on a mobile, three-component, total ankle replacement design. Wear was assessed gravimetrically and wear particles were analyzed. Wear testing resulted in a mean wear rate of 18.2 ± 1.4 mm3/106 cycles. Wear particles showed a mean size of 0.23 μm with an aspect ratio of 1.61 ± 0.96 and a roundness of 0.62 ± 0.14. Wear testing of total ankle replacement shows that a relevant wear mass is generated with wear particles in a biologically relevant size range. The developed wear test provides a basis for future wear testing of total ankle replacements. 
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