Journal
JOURNAL OF ARTHROPLASTY
Volume 35, Issue 4, Pages 1117-1122Publisher
CHURCHILL LIVINGSTONE INC MEDICAL PUBLISHERS
DOI: 10.1016/j.arth.2019.11.005
Keywords
corrosion; trunnion; taper; trunnionosis; mechanically assisted crevice corrosion
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Funding
- Adult Reconstruction and Joint Replacement Service via a Leonard Marmor Research Grant from Hospital for Special Surgery
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Background: We investigated the effect of taper design, head material, and manufacturer on simulated mechanically assisted crevice corrosion (MACC). Methods: Six pristine C-taper stems coupled with alumina-zirconia or cobalt-chromium (CoCr) heads were tested in a mechanical/electrochemical setup to measure average fretting currents and fretting current onset loads. Outcomes were compared with previous data from V40 tapers from the same manufacturer and 12/14 tapers from another manufacturer. Results: Within a single manufacturer, differences in average fretting current between V40 and C-taper designs were dependent on head material. Only with V40 tapers did CoCr heads show higher average fretting currents than ceramic heads. Between manufacturers, differences were found between similar taper designs, as 12/14 taper couples showed higher average fretting currents than C-taper couples, regardless of head material. Conclusion: Taper design, head material, and factors inherent to different manufacturers influence fretting current in simulated MACC. Unlike clinical and retrieval studies, this experimental design allows for investigations of factors affecting MACC in a controlled environment. Taper design, independent of manufacturer, contributes to the observed differences in average fretting current between head materials. In some taper designs, head composition, specifically ceramic, should not be considered alone to reduce risk of corrosion. (C) 2019 Elsevier Inc. All rights reserved.
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