SYMPOSIA PAPER Published: 01 January 1998

The Wear Characteristics of Sivash®/SRN® Co-Cr-Mo THA Articulating Surfaces


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.

Author Information

Scott, ML
University of Alabama at Birmingham, Birmingham, AL
Lemons, JE
University of Alabama at Birmingham, Birmingham, AL
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Developed by Committee: F04
Pages: 159–172
DOI: 10.1520/STP12837S
ISBN-EB: 978-0-8031-5391-2
ISBN-13: 978-0-8031-2490-5