Document Detail

Application of numerical descriptors to the characterization of wear particles obtained from joint replacements.
MedLine Citation:
PMID:  9141885     Owner:  NLM     Status:  MEDLINE    
The application of image analysis techniques to the characterization of wear particles from failed joint replacements has been described. Wear particles were extracted from periprosthetic tissues collected during revision surgery. Chemical digestive methods were used to separate the wear particles from the biological soft material. The particles isolated were examined by optical and scanning electron microscopy. Digitized particle images were analysed on a Macintosh computer by a specially developed software and by the image analysis program 'Prism'. The following numerical descriptors were used to characterize the particles: particle size, boundary fractal dimension and shape parameters such as form factor, roundness, convexity and aspect ratio. Elemental composition of the particles was determined by energy dispersive X-ray spectroscopy. Three selected types of wear particles were analysed and compared: titanium (Ti)-based and calcium (Ca)-based particles from a hip prosthesis and ultra-high molecular weight polyethylene (UHMWPE) particles from a knee prosthesis. The particles exhibited significantly different sizes and their shape numerical descriptors were also different. From the results obtained it appears that computer image analysis of wear particle morphology can be employed to determine the wear processes occurring in the joints. In some cases, the condition of the joint can also be assessed based on this analysis.
G W Stachowiak; G B Stachowiak; P Campbell
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine     Volume:  211     ISSN:  0954-4119     ISO Abbreviation:  Proc Inst Mech Eng H     Publication Date:  1997  
Date Detail:
Created Date:  1997-06-12     Completed Date:  1997-06-12     Revised Date:  2009-06-08    
Medline Journal Info:
Nlm Unique ID:  8908934     Medline TA:  Proc Inst Mech Eng H     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  1-10     Citation Subset:  IM    
Department of Mechanical and Materials Engineering, University of Western Australia, Perth.
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MeSH Terms
Hip Joint / ultrastructure*
Hip Prosthesis*
Image Enhancement / methods*
Knee Joint / ultrastructure*
Knee Prosthesis*
Microscopy, Electron, Scanning
Particle Size
Prosthesis Failure*
Surface Properties

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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