The tapered joints of modular hip implants are prone to fretting and crevice-corrosion. This can lead to total failure in under a year, especially for heavier, more active implant recipients. In this study, fractography of a failed Profemur Z implant showed that a life limiting fatigue crack was nucleated on the anterolateral surface of the implant's neck. The fatigue crack nucleation area appeared to have both more fretting damage and a higher corrosion rate than on other surfaces of the neck.
Williams, J. J., & Chawla, N. (2014). Fractography of a neck failure in a double-modular hip implant. Case Studies in Engineering Failure Analysis, 2(1), 45-50. doi:10.1016/j.csefa.2014.03.001
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