Document Detail


The wear of ultra-high molecular weight polyethylene sliding on metallic and ceramic counterfaces representative of current femoral surfaces in joint replacement.
MedLine Citation:
PMID:  9141887     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A number of studies have investigated the influence of surface roughness on the wear of ultra-high molecular weight polyethylene (UHMWPE) in total joint replacement. The results of these studies have shown that the wear factor is proportional to the counterface roughness raised to a power greater than one. In this laboratory study, the effect of surface finish of several biomaterials on the wear of UHMWPE was studied. The study was conducted using reciprocating pin-on-plate wear tests with bovine serum as a lubricant. The biomaterials investigated as the counterface material included stainless steel, cast cobalt chrome (CoCr), CoCr (ASTM F799), alumina ceramic and zirconia ceramic. The counterface topographies of the wear plates were produced using techniques representative of current manufacturing methods. The surface roughness of the wear plates was varied in the range Ra = 0.005-0.04 micron; this was representative of femoral heads and femoral knee components currently used clinically. Metals and ceramics with a similar surface roughness produced a similar wear rate of UHMWPE. For the limited range of smooth counterfaces used in this study only a moderate correlation was found between the surface roughness and the wear factors. For a change in counterface roughness Ra of 0.005 to 0.04 micron, the wear factor increased from 7.4 +/- 1.6 to 16.5 +/- 2.4 x 10(-9) mm3/N m (mean +/- standard error). This variation in counterface roughness had much less effect in wear than previously reported for rougher counterfaces. For an extended range of counterface roughness, a stronger correlation was found using an exponential function for the regression fit. The exponential function shows the benefits of decreased wear with decreased surface roughness. Although the wear rate decreased less rapidly with decreased counterface roughness for Ra values below 0.05 micron, there were significant advantages to be gained from improved femoral head roughness to below 0.01 micron Ra.
Authors:
J G Lancaster; D Dowson; G H Isaac; J Fisher
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
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:  17-24     Citation Subset:  IM    
Affiliation:
Department of Mechanical Engineering, University of Leeds.
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MeSH Terms
Descriptor/Qualifier:
Aluminum Oxide
Animals
Biocompatible Materials*
Cattle
Ceramics
Chromium Alloys
Hip Prosthesis*
Knee Prosthesis*
Lubrication
Materials Testing*
Polyethylenes*
Polypropylenes*
Prosthesis Design
Prosthesis Failure*
Stainless Steel
Surface Properties
Chemical
Reg. No./Substance:
0/Biocompatible Materials; 0/Ceramics; 0/Chromium Alloys; 0/Plastipore; 0/Polyethylenes; 0/Polypropylenes; 12597-68-1/Stainless Steel; 1344-28-1/Aluminum Oxide

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


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