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Lecture

Atomic Scale Origin of Metal Ion Release from Hip Implant Taper Junctions



Millions of patients per year receive a hip implant as treatment for end-stage arthritis. These hip implants often consist of a cobalt alloy (Co-30Cr-5Mo) femoral head and a titanium alloy (Ti-6Al-4V) femoral stem. In-vivo fretting corrosion at the head-neck taper junction can lead to release of metal ions (specifically Co and Cr from the cobalt alloy) and metal wear particles, creating adverse local and systemic effects in the patient. Correlative transmission electron microscopy / atom probe tomography reveals the mechanism of nano-structural and atomic scale chemical alterations in the subsurface of titanium alloy subjected to in-vitro fretting under conditions similar to those occurring in-vivo in the hip [1]. The fretting motion promotes tribocorrosion and hence Co-ion release from the more wear resistant cobalt alloy.

Speaker:
Dr. Michael Herbig
Max-Planck-Institut für Eisenforschung GmbH
Additional Authors:
  • Dr. Shanoob Balachandran
    Max-Planck-Institut für Eisenforschung
  • Dr. Zita Zachariah
    Max-Planck-Institut für Eisenforschung
  • Prof. Dr. Alfons Fischer
    Max-Planck-Institut für Eisenforschung
  • David Mayweg
    Max-Planck-Institut für Eisenforschung
  • Prof. Dr. Markus Wimmer
    Rush University Medical Center
  • Prof. Dr. Dierk Raabe
    Max-Planck-Institut für Eisenforschung