Bergiers, S;
Hothi, HS;
Henckel, J;
Eskelinen, A;
Skinner, J;
Hart, A;
(2018)
Wear performance of retrieved metal-on-metal Pinnacle hip arthroplasties implanted before and after 2007.
Bone & Joint Research
, 7
(11)
pp. 595-600.
10.1302/2046-3758.711.BJR-2018-0143.R1.
Preview |
Text
2046-3758.711.bjr-2018-0143.r1.pdf - Published Version Download (728kB) | Preview |
Abstract
Objectives: Previous studies have suggested that metal-on-metal (MoM) Pinnacle (DePuy Synthes, Warsaw, Indiana) hip arthroplasties implanted after 2006 exhibit higher failure rates. This was attributed to the production of implants with reduced diametrical clearances between their bearing surfaces, which, it was speculated, were outside manufacturing tolerances. This study aimed to better understand the performance of Pinnacle Systems manufactured before and after this event. Methods: A total of 92 retrieved MoM Pinnacle hips were analyzed, of which 45 were implanted before 2007, and 47 from 2007 onwards. The 'pre-2007' group contained 45 implants retrieved from 21 male and 24 female patients, with a median age of 61.3 years (interquartile range (IQR) 57.1 to 65.5); the '2007 onwards' group contained 47 implants retrieved from 19 male and 28 female patients, with a median age of 61.8 years (IQR 58.5 to 67.8). The volume of material lost from their bearing and taper surfaces was measured using coordinate and roundness measuring machines. These outcomes were then compared statistically using linear regression models, adjusting for potentially confounding factors. Results: There was no significant difference between the taper and bearing wear rates of the 'pre-2007' and '2007 onwards' groups (p = 0.67 and p = 0.39, respectively). Pinnacles implanted from 2007 onwards were revised after a mean time of 50 months, which was significantly earlier than the 'pre-2007' hips (96 months) (p < 0.001). A reduction in the time to revision was present year on year from 2003 to 2011. Conclusion: We found no difference in the wear rate of these implants based on the year of implantation. The 'pre-2007' hips had a two-fold greater time to revision than those implanted after 2007; this may be due to the increased surveillance of MoM hips following UK regulatory advice and several high-profile failures. Interestingly, we observed a decreasing trend in the mean time to revision every year from 2003 onwards.Cite this article: S. Bergiers, H. S. Hothi, J. Henckel, A. Eskelinen, J. Skinner, A. Hart. Wear performance of retrieved metal-on-metal Pinnacle hip arthroplasties implanted before and after 2007.
| Type: | Article |
|---|---|
| Title: | Wear performance of retrieved metal-on-metal Pinnacle hip arthroplasties implanted before and after 2007 |
| Location: | England |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1302/2046-3758.711.BJR-2018-0143.R1 |
| Publisher version: | http://doi.org/10.1302/2046-3758.711.BJR-2018-0143... |
| Language: | English |
| Additional information: | Copyright © 2018 Author(s) et al. This is an open-access article distributed under the terms of the Creative Commons Attributions licence (CC-BY-NC), which permits unrestricted use, distribution, and reproduction in any medium, but not for commercial gain, provided the original author and source are credited. |
| Keywords: | Material loss, Metal-on-metal, Retrieval, Wear analysis |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Surgery and Interventional Sci UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Surgery and Interventional Sci > Department of Ortho and MSK Science |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10064938 |
Archive Staff Only
 |
View Item |
