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5-4 Mrads historically used for sterilization are now being implanted clinically. While there are considerable data from hip simulators that suggest that the wear rate of these new, cross-linked materials may be lower than their predecessors , there are little clinical data available. This study provides the results of the analysis of six retrieved cross-linked acetabular bearings, all with implantation durations of less than two years. K E Y W O R D S : cross-link, polyethylene, acetabular, wear Experimental Methods All 6 retrieved bearings were photographed and examined visually using a Nikon Binocular Dissecting Microscope (Nikon Corporation, Tokyo, Japan) with a magnification factor of 10.
The horizontal thin sections taken from each beating flange were stamped, using a metal die, into a dumbbell configuration suitable for mechanical testing, in accordance with the ASTM Test Method for Tensile Properties of Plastics (D#638-99). 62 mm), but with smaller gripping zones, again because of bearing geometry limitations. Uniaxial tension tests were done using these dumbbell-shaped horizontal thin sections. Ultimate tensile strength, elongation at break, and tensile stress at yield point were measured for each thin section.
We hypothesized that m vivo wear damage would significantly alter the surface roughness and waviness of conventional and highly crosslinked UHMWPE liners after short-term implantation. , machining marks, or adhesive/abrasive wear), the surface roughness and waviness was material-specific. The direct measurement of surface roughness and waviness of highly crosslinked UHMWPE liners from retrievals will useful for the validation of hip simulator studies for these types of polymeric materials. Ultimately, our long-term goal is to compile a database of surface roughness and waviness measurements for all types of highly crosslinked UHMWPEs after short-term, intermediate-term, and long-term implantation to facilitate ongoing hip simulator development and validation.
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