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Retrieval analysis of modern knee tumor megaendoprosthesis shows considerable volumetric metal wear generated at the rotating hinge

Frequently occurring damage, as well as elevated blood metal ion levels, are reported in relation to a tumor and revision system for total knee arthroplasty (TKA), which applies a rotating hinge coupling with a metal-on-metal (MoM) articulation. As the patient collective for this specific system is...

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Bibliographische Detailangaben
Hauptverfasser: Bormann, Therese (VerfasserIn) , Jäger, Sebastian (VerfasserIn) , Kretzer, Jan Philippe (VerfasserIn) , Nebel, Laura (VerfasserIn) , Clarius, Lucas (VerfasserIn) , Omlor, Georg (VerfasserIn) , Bitsch, Rudi G. (VerfasserIn) , Lehner, Burkhard (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 26 March 2020
In: Materials
Year: 2020, Jahrgang: 13, Heft: 7
ISSN:1996-1944
DOI:10.3390/ma13071519
Online-Zugang:Verlag, kostenfrei, Volltext: https://doi.org/10.3390/ma13071519
Verlag, kostenfrei, Volltext: https://www.mdpi.com/1996-1944/13/7/1519
Volltext
Verfasserangaben:Therese Bormann, Sebastian Jäger, J. Philippe Kretzer, Laura Nebel, Lucas Clarius, Georg Omlor, Rudi Bitsch, Burkhard Lehner
Beschreibung
Zusammenfassung:Frequently occurring damage, as well as elevated blood metal ion levels, are reported in relation to a tumor and revision system for total knee arthroplasty (TKA), which applies a rotating hinge coupling with a metal-on-metal (MoM) articulation. As the patient collective for this specific system is small, there is no data on wear generated from the couplings. In this study, wear volume and influencing parameters were investigated at 44 retrieved TKAs with MoM couplings. A scoring system rating frequently occurring abrasive wear between 0 (no wear) and 3 (distinct wear) was established. The wear score was correlated to time in vivo, bone resection length, patient weight and polyethylene inlay damage. Volumetric wear was estimated applying coordinate measurements. An elevated wear score of two or higher was found in 43% of cases. The mean wear rate accounted to 7.8 mm3/year. The main influencing coefficient for the extent of wear is time in vivo. We found a tendency for higher wear scores with higher inlay degradation scores. Patient weight and bone resection length did not impact coupling wear. Assessment of wear damage by a semi-quantitative scoring system has proven to be a reliable option for non-destructive coupling evaluation. The generated wear volume is high.
Beschreibung:Gesehen am 27.05.2020
Beschreibung:Online Resource
ISSN:1996-1944
DOI:10.3390/ma13071519

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