Third-body wear of highly cross-linked polyethylene in a hip simulator1
Section snippets
Materials and methods
The conventional (gamma in nitrogen) UHMWPE, which served as the control material, and the highly cross-linked UHMWPE acetabular liners were prepared as follows: Cylindrical discs (9 cm in diameter and 4 cm in height) were machined from ram-extruded GUR 1 050 UHMWPE bar stock (Poly-Hi Solidur, Lenni, PA). Eight control acetabular liners (28 mm inner diameter by 49 mm outer diameter) of the Inter-Op design (Centerpulse Orthopaedics, Austin, TX) were machined from some of these discs. To obtain
Results
Table 1 lists the average values of the incremental wear rates with and without third-body particles for each phase. Fig. 4 shows the average weight change of these liners as a function of the number of cycles of testing over the entire 13 million cycles of simulated gait. The average incremental wear rate (Fig. 5) of the conventional and highly cross-linked liners in the presence of aluminum oxide particles continually increased over time. The weight loss of the conventional components was
Discussion
The present study investigated the effect of 2 different kinds of third-body particles with different physical characteristics on the wear of conventional versus highly cross-linked polyethylene acetabular components in a hip simulator. To date, one experimental model for evaluating polyethylene wear in the presence of hard third-body particles has been reported [14], and no tests have been standardized. Other studies have attempted to simulate the effect of third-body wear using scratched or
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Benefits or funds were received in partial or total support of the research material described in this article from the William H. Harris Foundation and Centerpulse Orthopaedics, Austin, Texas.