Tribological performance of various CoCr microstructures in metal-on-metal bearings: the development of a more physiological protocol in vitro.

نویسندگان

  • A Kamali
  • A Hussain
  • C Li
  • J Pamu
  • J Daniel
  • H Ziaee
  • D J W McMinn
چکیده

Hip simulators have been used for ten years to determine the tribological performance of large-head metal-on-metal devices using traditional test conditions. However, the hip simulator protocols were originally developed to test metal-on-polyethylene devices. We have used patient activity data to develop a more physiologically relevant test protocol for metal-on-metal devices. This includes stop/start motion, a more appropriate walking frequency, and alternating kinetic and kinematic profiles. There has been considerable discussion about the effect of heat treatments on the wear of metal-on-metal cobalt chromium molybdenum (CoCrMo) devices. Clinical studies have shown a higher rate of wear, levels of metal ions and rates of failure for the heat-treated metal compared to the as-cast metal CoCrMo devices. However, hip simulator studies in vitro under traditional testing conditions have thus far not been able to demonstrate a difference between the wear performance of these implants. Using a physiologically relevant test protocol, we have shown that heat treatment of metal-on-metal CoCrMo devices adversely affects their wear performance and generates significantly higher wear rates and levels of metal ions than in as-cast metal implants.

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عنوان ژورنال:
  • The Journal of bone and joint surgery. British volume

دوره 92 5  شماره 

صفحات  -

تاریخ انتشار 2010