SYMPOSIA PAPER Published: 01 January 2003

Fretting and Anodic Current of the Taper Interface of Stainless Steel Hip Stems/Cobalt-Chromium Femoral Heads


Three types of hip stems, MS-30 high-nitrogen stainless steel, Natural Hip cobalt-chromium, and APR® II porous titanium were interfaced with cobalt-chromium femoral heads. They were tested according to ASTM F 1875-98. In the initial 1 Hz cyclic loading up to 480 cycles, the average fretting current generated from the taper interface was 0.4, 0.6, and 1 μA, respectively for the stainless steel, cobalt-chromium, and titanium stems. In the following 2 Hz cyclic loading up to 3600 cycles, the average fretting current was 1.3, 0.6, and 2.25 μA, accordingly. In the potentiodynamic polarization, the titanium stems showed relatively high anodic current in the range of -100 to 500 mV. The cobalt-chromium stems had the highest anodic current in the range of 500 to 1200 mV. The stainless steel stems exhibited the best corrosion resistance in the whole potential range of polarization.

Author Information

Zhu, M
Sulzer Orthopedics Inc., Austin, TX, USA
Windler, M
Sulzer Orthopedics Ltd., Winterthur, Switzerland
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Developed by Committee: F04
Pages: 235–246
DOI: 10.1520/STP11167S
ISBN-EB: 978-0-8031-5483-4
ISBN-13: 978-0-8031-3459-1