Corrosion in CoCrMo Modular Taper Junctions in Femoral Knee Component - A Retrieval Study

Description

The presentation discusses the topic of modularity in total hip and knee replacement surgeries, specifically focusing on the corrosion issues of modular junctions in femoral knee components. The speaker outlines the existing literature on the mechanical and chemical corrosion processes affecting modular joints in hip replacements, citing the need for further investigation into similar phenomena in knee implants.



They present findings from a study involving the examination of eight femoral knee components made from cobalt chrome molybdenum alloy and their corrosion modes compared to hip replacements. Using various cross-sectioning techniques and optical analysis, the team observed different types of corrosion, including mechanical-assisted and chemical corrosion, particularly in the proximal modular junctions and in open areas without modular junctions.



The presentation highlights critical observations such as the presence of dendritic structures, unidirectional threading scars indicative of mechanical wear, and a significant amount of pitting corrosion covered by oxide debris. Furthermore, chemical analysis revealed high concentrations of molybdenum and titanium in corrosion areas, suggesting material migration from the titanium stem.



In conclusion, the study finds similarities in corrosion mechanisms between hip replacements and knee replacements, emphasizing the clinical concerns associated with these corrosion modes. The speaker invites questions from the audience regarding their findings.

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