ASTM F1440 – Standard Practice for Cyclic Fatigue Testing of Metallic Stemmed Hip Arthroplasty Femoral Components Without Torsion

This practice describes a method for the fatigue testing of metallic stemmed femoral components used in hip arthroplasty.  The described method is intended to be used to evaluate the comparison of various designs and materials used for stemmed femoral components used in the arthroplasty.  This practice covers procedures for the performance of fatigue tests using (as a forcing function) a periodic constant amplitude force.  This practice applies primarily to one-piece prostheses and modular components, with head in place such that prostheses should not have an anterior/posterior bow, and should have a nearly straight section on the distal 50 mm of the stem.  This practice may require modifications to accommodate other femoral stem designs.

This practice can be used to describe the effects of materials, manufacturing, and design variables on the fatigue resistance of metallic stemmed femoral components subjected to cyclic loading for relatively large numbers of cycles.  The recommended test assumes a “worst case” situation where proximal support for the stem has been lost.  It is also recognized that for some materials the environment may have an effect on the response to cyclic loading.

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