Document Detail

Wear of polyethylene acetabular cups against alumina femoral heads. 5 prostheses compared in a hip simulator for 35 million walking cycles.
MedLine Citation:
PMID:  8237313     Owner:  NLM     Status:  MEDLINE    
5 ultra-high molecular weight polyethylene acetabular cups articulated against alumina femoral heads for 35 million walking cycles in a hip joint simulator designed for wear tests of total hip prostheses. The specimens were from Protek, Biomet, Link, Howmedica and Thackray. In the Howmedica specimen, the wear was zero, and in Link and Thackray practically negligible. In Biomet, however, the wear was noteworthy and in Protek disastrous after 20 million cycles because in these 2 prostheses the head was attached to a titanium-alloy stem by taper-fit: titanium-alloy particles that were removed from the taper because of micromotion between the head and stem were entrapped between the head and cup, adhering to the head and making it rough, which led to severe abrasive wear of the Protek cup. It was worn through at 26 million cycles, the total wear being 3,170 mg. In Biomet, Link and Thackray, the total wear was 124, 5.3 and 17.6 mg, respectively. Polyethylene wear particles may lead to adverse tissue reactions and eventual loosening of the implant. The results indicate that by the use of alumina heads, polyethylene wear can be eliminated, but this advantage may be lost if the head is attached to a titanium-alloy taper.
V O Saikko
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Acta orthopaedica Scandinavica     Volume:  64     ISSN:  0001-6470     ISO Abbreviation:  Acta Orthop Scand     Publication Date:  1993 Oct 
Date Detail:
Created Date:  1993-12-22     Completed Date:  1993-12-22     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370352     Medline TA:  Acta Orthop Scand     Country:  DENMARK    
Other Details:
Languages:  eng     Pagination:  507-12     Citation Subset:  IM    
Helsinki University of Technology, Laboratory of Machine Design, Espoo, Finland.
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MeSH Terms
Aluminum Oxide
Hip Prosthesis / instrumentation*,  methods
Materials Testing*
Prosthesis Design
Prosthesis Failure
Reg. No./Substance:
0/Polyethylenes; 1344-28-1/Aluminum Oxide

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