1. Scope This standard establishes requirements and considerations for fretting and corrosion testing of modular femoral heads for use in conjunction with hip stems. 1.1 Purpose: This guide establishes requirements and considerations for fretting and corrosion testing of modular femoral heads that are taper locked on a femoral hip stem taper. A method is provided that describes the setup and load for the corrosion test as well as a method to measure the ions that are released. The recommended content of an engineering report covering the mechanical test is presented.
4. Significance and Use 4.1 This test method is intended to comparatively assess the fretting and corrosion behavior of the taper connection between a modular femoral head and hip stem taper. The method is not intended for long term cyclic performance, but was designed to induce a significant amount of fretting and corrosion while allowing the inclusion of an 8 hour rest period during each 24 hour test period. This was done because it was found that the absence of the rest period yielded results that did not accurately represent the corrosion taking place in-vivo1. 4.2 For simplicity, this method does not use an actual hip stem, therefore any effects on fretting and corrosion due to hip stem design would need to be evaluated separately.
Fatigue; Fretting; Corrosion; Hip; Modular; Taper; Neck
The title and scope are in draft form and are under development within this ASTM Committee.
Citing ASTM Standards
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