Linked Life Data

8872582

Source:http://linkedlifedata.com/resource/pubmed/id/8872582

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
1997-2-28
pubmed:abstractText
The purpose of this study was to determine the effect of compression cycles and wear patterns on the polyethylene liner-metallic shell interface in modular acetabular components. Articular frictional torque was also measured. Modular acetabular components from five manufacturers were tested. The polyethylene liners were sputter coated with gold on the convex surface to enhance the visualization of wear and deformation patterns. Each component was cycled for 10 million cycles in a hydraulic fatigue testing machine. Frictional torque was measured prior to the start of the cyclic loading and in increments of 2 million cycles. Frictional torque was significantly lower in the design with an enhanced polyethylene liner. Abrasion of the gold from the convex surface of polyethylene liners varied from 2 to 23% between designs. Extrusion of the polyethylene into the screw holes in the metallic shells was universal. Three modes of damage (burnishing, punch-out, and gouging) were identified on the convex surface of the polyethylene liner. Abrasion of the gold from the convex surface of the polyethylene varied greatly between designs. This is indicative of relative motion between the polyethylene liner and the metallic shell. This motion must be minimized to limit the generation of wear debris from the convex surface of the polyethylene. Several aspects of modular acetabular component design could be implemented to potentially reduce wear, including limiting the number of holes available for screw placement, smoothing out the edges of the screw holes to avoid punch-out, and avoiding supplemental fixation of the liner unless it is essential to prevent motion between the liner and the metallic shell.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0883-5403
pubmed:author
pubmed:issnType
Print
pubmed:volume
11
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
602-8
pubmed:dateRevised
2004-11-17
pubmed:meshHeading
pubmed:year
1996
pubmed:articleTitle
Wear of the polyethylene liner-metallic shell interface in modular acetabular components. An in vitro analysis.
pubmed:affiliation
Department of Orthopaedic Surgery, UCLA Medical Center 90024, USA.
pubmed:publicationType
Journal Article