Modular necks in total hip replacement (THR) can be a source of metal ion release.
We measured the level of cobalt (Co) and chromium (Cr) ions in the serum of 23 healthy volunteers with a well-functioning ceramic-on-ceramic THR of a particular design, containing a cobalt-chrome (Co-Cr) stem and a Co-Cr modular neck.
Average Co in serum was 1,71 µg/l; median Co was 1.50 µg/l. No patient had Co levels higher than 3.70 µg/l. Average Cr level was 0.49 µg/l; in all but one patient Cr was below the detection limit (<0.50 µg/l). Co was higher for varus necks compared to all other subtypes: 2.14 µg/l vs 1.58 µg/l (p<0.05). The same system with Titanium modular necks shows lower Co serum levels: 1.26 µg/l (p<0.01 ). In conclusion, the hybrid THR Profemur Xm® – Procotyle L® with a Co-Cr modular neck on a Co-Cr stem design shows very low Cr ion serum levels in a randomly selected group of well-functioning hip patients.
Co ion serum levels are low, but significantly higher for 8° varus necks, and Co levels are significantly higher than values of this system with a Titanium modular neck.
Hip Int 2017; 27(1): 21 - 25
Article Type: ORIGINAL RESEARCH ARTICLE
AuthorsJan F.A. Somers, Lieven Dedrye, Sofie Goeminne
- • Accepted on 13/06/2016
- • Available online on 24/10/2016
- • Published in print on 21/02/2017
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- Somers, Jan F.A. [PubMed] [Google Scholar] 1, * Corresponding Author (firstname.lastname@example.org)
- Dedrye, Lieven [PubMed] [Google Scholar] 1
- Goeminne, Sofie [PubMed] [Google Scholar] 2
Department of Orthopaedic and General Surgery, Jan Yperman Hospital, Ypres - Belgium
Department of Orthopaedic Surgery, Catholic University of Leuven, Leuven - Belgium