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The Chemical Form of Metal Species Released from Corroded Taper Junctions of Hip Implants: Synchrotron Analysis of Patient Tissue

DOI: 10.1038/s41598-017-11225-w DOI Help

Authors: Anna Di Laura (University College London (UCL)) , Paul D. Quinn (Diamond Light Source) , Vasiliki C. Panagiotopoulou (University College London; Royal National Orthopaedic Hospital) , Harry S. Hothi (University College London; Royal National Orthopaedic Hospital) , Johann Henckel (University College London; Royal National Orthopaedic Hospital) , Jonathan J. Powell (University of Cambridge) , Fitim Berisha (University College London; Royal National Orthopaedic Hospital) , Fernanda Amary (University College London; Royal National Orthopaedic Hospital) , J. Fred W. Mosselmans (Diamond Light Source) , John A. Skinner (University College London; Royal National Orthopaedic Hospital) , Alister J. Hart (University College London; Royal National Orthopaedic Hospital)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Scientific Reports , VOL 7

State: Published (Approved)
Published: September 2017
Diamond Proposal Number(s): 8779 , 12646

Open Access Open Access

Abstract: The mechanisms of metal release from the articulation at the head cup bearing and the tapered junctions of orthopaedic hip implants are known to differ and the debris generated varies in size, shape and volume. Significantly less metal is lost from the taper junction between Cobalt-Chromium- Molybdenum (CoCrMo) and Titanium (Ti) components (fretting-corrosion dominant mechanism), when compared to the CoCrMo bearing surfaces (wear-corrosion dominant mechanism). Corrosion particles from the taper junction can lead to Adverse Reactions to Metal Debris (ARMD) similar to those seen with CoCrMo bearings. We used synchrotron methods to understand the modes underlying clinically significant tissue reactions to Co, Cr and Ti by analysing viable peri-prosthetic tissue. Cr was present as Cr2O3 in the corroded group in addition to CrPO4 found in the metal-on-metal (MoM) group. Interestingly, Ti was present as TiO2 in an amorphous rather than rutile or anatase physical form. The metal species were co-localized in the same micron-scale particles as result of corrosion processes and in one cell type, the phagocytes. This work gives new insights into the degradation products from metal devices as well as guidance for toxicological studies in humans.

Journal Keywords: Co-chrome hip implants; corrosion; taper junctions

Subject Areas: Medicine, Biology and Bio-materials


Instruments: I18-Microfocus Spectroscopy

Documents:
s41598-017-11225-w.pdf