PMMA Third-Body Wear after Unicondylar Knee Arthroplasty Decuples the UHMWPE Wear Particle Generation In Vitro

Introduction. Overlooked polymethylmethacrylate after unicondylar knee arthroplasty can be a potential problem, since this might influence the generated wear particle size and morphology. The aim of this study was the analysis of polyethylene wear in a knee wear simulator for changes in size, morpho...

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Bibliographic Details
Published in:BioMed research international 2015-01, Vol.2015 (2015), p.1-7
Main Authors: Jansson, Volkmar, Schröder, Christian, Kraxenberger, Michael, Franke, Manja, Paulus, Alexander Christoph, Utzschneider, Sandra
Format: Article
Language:English
Subjects:
Analysis
Arthroplasty, Replacement, Knee
Atoms & subatomic particles
Bone surgery
Bones
Health aspects
Humans
Joint surgery
Knee Prosthesis
Knees
Materials Testing
Morphology
Particulate Matter - chemistry
Polyethylene
Polyethylenes
Polymethyl Methacrylate - chemistry
Polymethyl methacrylates
Polymethylmethacrylate
Prostheses
Surgical implants
Wear
Wear particles
Wear resistance
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Summary:Introduction. Overlooked polymethylmethacrylate after unicondylar knee arthroplasty can be a potential problem, since this might influence the generated wear particle size and morphology. The aim of this study was the analysis of polyethylene wear in a knee wear simulator for changes in size, morphology, and particle number after the addition of third-bodies. Material and Methods. Fixed bearing unicondylar knee prostheses (UKA) were tested in a knee simulator for 5.0 million cycles. Following bone particles were added for 1.5 million cycles, followed by 1.5 million cycles with PMMA particles. A particle analysis by scanning electron microscopy of the lubricant after the cycles was performed. Size and morphology of the generated wear were characterized. Further, the number of particles per 1 million cycles was calculated for each group. Results. The particles of all groups were similar in size and shape. The number of particles in the PMMA group showed 10-fold higher values than in the bone and control group (PMMA: 10.251×1012; bone: 1.145×1012; control: 1.804 × 1012). Conclusion. The addition of bone or PMMA particles in terms of a third-body wear results in no change of particle size and morphology. PMMA third-bodies generated tenfold elevated particle numbers. This could favor an early aseptic loosening.
ISSN:2314-6133
2314-6141
DOI:10.1155/2015/575849