How to cite this article: Gilbert JL, Mali S, Urban RM, Silverton CD, Jacobs JJ. 2012. In vivo oxide-induced stress corrosion cracking of Ti-6Al-4V in a neck–stem modular taper: Emergent behavior in a new mechanism of in vivo corrosion. J Biomed Mater Res Part B 2012:100B: 584–594.
Clinical Device-Related Article
In vivo oxide-induced stress corrosion cracking of Ti-6Al-4V in a neck–stem modular taper: Emergent behavior in a new mechanism of in vivo corrosion†
Article first published online: 24 NOV 2011
Copyright © 2011 Wiley Periodicals, Inc.
Journal of Biomedical Materials Research Part B: Applied Biomaterials
Volume 100B, Issue 2, pages 584–594, February 2012
How to Cite
Gilbert, J. L., Mali, S., Urban, R. M., Silverton, C. D. and Jacobs, J. J. (2012), In vivo oxide-induced stress corrosion cracking of Ti-6Al-4V in a neck–stem modular taper: Emergent behavior in a new mechanism of in vivo corrosion. J. Biomed. Mater. Res., 100B: 584–594. doi: 10.1002/jbm.b.31943
- Issue published online: 4 JAN 2012
- Article first published online: 24 NOV 2011
- Manuscript Accepted: 13 JUN 2011
- Manuscript Revised: 3 JUN 2011
- Manuscript Received: 2 MAY 2011
- NIH. Grant Number: AR039310
- Zimmer, Rush Arthritis and Orthopaedic Institute
- failure analysis;
- hip prosthesis;
- titanium (alloys)
In vivo modular taper corrosion in orthopedic total joint replacements has been documented to occur for head–neck tapers, modular-body tapers, and neck–stem tapers. While the fretting corrosion mechanism by which this corrosion occurs has been described in the literature, this report shows new and as yet unreported mechanisms at play. A retrieved Ti-6Al-4V/Ti-6Al-4V neck–stem taper interface, implanted for 6 years is subjected to failure analysis to document taper corrosion processes that lead to oxide driven crack formation on the medial side of the taper. Metallurgical sectioning techniques and scanning electron microscopy analysis are used to document the taper corrosion processes. The results show large penetrating pitting attack of both sides of the taper interface where corrosion selectively attacks the beta phase of the microstructure and eventually consumes the alpha phase. The pitting attack evolves into plunging pits that ultimately develop into cracks where the crack propagation process is one of corrosion resulting in oxide formation and subsequent reorganization. This process drives open the crack and advances the front by a combination of oxide-driven crack opening stresses and corrosion attack at the tip. The oxide that forms has a complex evolving structure including a network of transport channels that provide access of fluid to the crack tip. This emergent behavior does not appear to require continued fretting corrosion to propagate the pitting and cracking. This new mechanism is similar to stress corrosion cracking where the crack tip stresses arise from the oxide formation in the crack and not externally applied tensile stresses. © 2011 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 100B: 584–594, 2012.