Concerning Crevice Corrosion in Metaphyseal Sleeves of Revision Total Knee Components

Description

This presentation, led by Shabnam Aslani, focuses on the critical issue of corrosion in metaphyseal sleeves and interfaces of total knee components, highlighting both corrosion and crevice corrosion. Aslani discusses the potential consequences of corrosion, including metal ion release and adverse tissue reactions, supported by real patient reports showcasing osteolysis and the presence of pseudo-tumors.



The research aims to evaluate the prevalence and characteristics of corrosion at femoral and tibial interfaces, investigating 27 implants over an average of 2 to 2.5 years, with a significant number requiring revision due to infection and loosening. Utilizing the Goldberg method for damage assessment, Aslani presents findings showing corrosion in various components, predominantly affecting the tibial and femoral sleeves and stems.



Detailed results reveal that 47% of tibial sleeves and 65% of tibial stems exhibited corrosion, while alarming rates of corrosion (71%) were found in both femoral sleeves and stems. The presence of mechanically assisted crevice corrosion, pitting, etching, and preferential dissolution was documented through scanning electron microscopy.



The findings are significant, pointing towards differing predominant damage modes between femoral and tibial components, with mechanical damage more prevalent in tibial sleeves. Future research plans include a quantitative analysis of corrosion levels on gold bare metals and further comparisons of damage across implant types. Aslani concludes with a thank you, receiving applause from the audience.

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