SYMPOSIA PAPER Published: 01 January 2003
STP11152S

Mechanical and Corrosion Properties of Forged Hip Stems made of High-NitrogenStainless Steel

Source

The purpose of the study was to determine the mechanical and corrosion roperties of forged, commercially available, femoral hip stems. Two different stem designs were selected (the MS-30, sizes 6 and 16, and the MUELLER straight stem, sizes 7.5 and 15.0). They were made of high-nitrogen stainless steel according to ISO 5832-9 and ASTM F1586. The samples for determining the mechanical properties were taken from the proximal part of the prostheses. The metallurgical and the potentio-dynamic corrosion behaviours were investigated in three different transverse cross-sectional planes. The mechanical properties in the forged condition were as follows: Yield strength 1051 – 1172 MPa, tensile strength 1138 – 1238 MPa and elongation 15 – 19%. Vickers hardness values of between 354 and 393 HV were measured. The breakdown potential fell from +1000 mV(SCE) (wrought bar) to +600 to +950 mV(SCE) (forged hip stems) for pH 4 and 37°C. The rotational bending fatigue value for 10 million cycles was 587 MPa.

Author Information

Windler, M
Sulzer Orthopedics Ltd., Winterthur, Switzerland
Steger, R
Sulzer Orthopedics Ltd., Winterthur, Switzerland
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Details
Developed by Committee: F04
Pages: 39–49
DOI: 10.1520/STP11152S
ISBN-EB: 978-0-8031-5483-4
ISBN-13: 978-0-8031-3459-1