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The objectives of this study were to characterize and quantify the wear for fourteen explanted Sivash/SRN total hip articulating components. A stereoscope and MicroVu optical measuring system were used to microscopically characterize the wear patterns on the bearing components, while a Checkmaster coordinate measuring machine (CMM) was used to estimate both the linear and volumetric wear of the components. Three distinct zones on the component surfaces were revealed: noncontact, transition, and wear (load-bearing). Maximum wear occurred most often on the superolateral aspect of the femoral head components. The combined linear and volumetric wear rates of the bearing couples averaged 17 μm/year and 5.2 mm3year, respectively. The combined linear wear rates decreased significantly (p= 0.03) with a longer time in situ. The service life of the implants was found to increase significantly with decreasing radial clearance (p= 0.03), but no significant correlation was found between radial clearance and either linear or volumetric wear rates.
total hip replacement, wear, metal-on-metal, tribology, osteolysis
Graduate Assistant, University of Alabama at Birmingham, Birmingham, AL
Professor, University of Alabama at Birmingham, Birmingham, AL