A simulator study of adverse wear with metal and cement debris contamination in metal-on-metal hip bearings

Bone & Joint Research
Thomas HalimJ G Bowsher

Abstract

Third-body wear is believed to be one trigger for adverse results with metal-on-metal (MOM) bearings. Impingement and subluxation may release metal particles from MOM replacements. We therefore challenged MOM bearings with relevant debris types of cobalt-chrome alloy (CoCr), titanium alloy (Ti6Al4V) and polymethylmethacrylate bone cement (PMMA). Cement flakes (PMMA), CoCr and Ti6Al4V particles (size range 5 µm to 400 µm) were run in a MOM wear simulation. Debris allotments (5 mg) were inserted at ten intervals during the five million cycle (5 Mc) test. In a clean test phase (0 Mc to 0.8 Mc), lubricants retained their yellow colour. Addition of metal particles at 0.8 Mc turned lubricants black within the first hour of the test and remained so for the duration, while PMMA particles did not change the colour of the lubricant. Rates of wear with PMMA, CoCr and Ti6Al4V debris averaged 0.3 mm(3)/Mc, 4.1 mm(3)/Mc and 6.4 mm(3)/Mc, respectively. Metal particles turned simulator lubricants black with rates of wear of MOM bearings an order of magnitude higher than with control PMMA particles. This appeared to model the findings of black, periarticular joint tissues and high CoCr wear in failed MOM replacements. The amount of wear debris ...Continue Reading

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Citations

May 7, 2013·The Journal of Arthroplasty·Thomas L BernasekMichael J Adler
Oct 28, 2015·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·Danielle de VilliersAlister Hart
Jan 9, 2020·Journal of Biomechanical Engineering·Andrew P BaumannMatthew Di Prima
Jun 27, 2020·Macromolecular Bioscience·Onur Parlak, Agneta Richter-Dahlfors

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Methods Mentioned

BETA
total hip arthroplasty
chips

Software Mentioned

MOM

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