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Assessment of corrosion in retrieved spine implants

Panagiotopoulou, VC; Hothi, HS; Anwar, HA; Molloy, S; Noordeen, H; Rezajooi, K; Sutcliffe, J; ... Hart, AJ; + view all (2018) Assessment of corrosion in retrieved spine implants. Journal of Biomedical Materials Research Part B: Applied Biomaterials , 106 (2) pp. 632-638. 10.1002/jbm.b.33858. Green open access

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Abstract

Recently the use of dissimilar metals in spine instrumentation has increased, especially in the case of adult deformities, where rods made from Cobalt Chrome alloys (CoCr) are used with Titanium (Ti) screws. The use of dissimilar metals increases the risk of galvanic corrosion and patients have required revision spine surgery due to severe metallosis that may have been caused by corrosion. We aimed to assess the presence of corrosion in spine implant retrievals from constructs with two types of material combinations: similar (Ti/Ti) and dissimilar (CoCr/Ti). First, we devised a grading score for corrosion of the rod-fixture junctions. Then, we applied this score to a collection of retrieved spine implants. Our proposed corrosion grading score was proven reliable (kappa > 0.7). We found no significant difference in the scores between 4 CoCr and 11 Ti rods (p = 0.0642). There was no indication that time of implantation had an effect on the corrosion score (p = 0.9361). We recommend surgeons avoid using implants designs with dissimilar metals to reduce the risk of corrosion whilst a larger scale study of retrieved spine implants is conducted. Future studies can now use our scoring system for spine implant corrosion.

Type: Article
Title: Assessment of corrosion in retrieved spine implants
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/jbm.b.33858
Publisher version: http://doi.org/10.1002/jbm.b.33858
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Cobalt-chromium (alloys), corrosion, implant retrieval, spinal implant, titanium (alloys)
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/1551079
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