These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Alumina hip joints characterized by run-in wear and steady-state wear to 14 million cycles in hip-simulator model.
    Author: Oonishi H, Clarke IC, Good V, Amino H, Ueno M.
    Journal: J Biomed Mater Res A; 2004 Sep 15; 70(4):523-32. PubMed ID: 15307156.
    Abstract:
    The biphasic wear performance (run-in; steady-state phase) of 28-mm alumina-alumina hip implants was studied by hip simulator methods using bovine serum as the lubricant. The Biolox implants were run to 5.7 million cycles and Bioceram implants to 14.4 million cycles (Mc). Wear with all-alumina total hip replacements (THR) first showed a high wear rate of the order 1.2 mm3/Mc, lasting approximately 0.17 Mc. Overall to 0.7 Mc, the run-in phase appeared curvilinear but could be described by a linear phase averaging 0.3 mm3/Mc. From 0.7 to 1 Mc duration, the wear trend transitioned into a steady-state phase. Wear rates from 1 to 14 Mc were of the order 0.02 mm3/Mc. Surface contamination from the serum lubricant resulted in cyclic weight fluctuations of the order 0.2 mg. The transition from average run-in to steady-state phase represented a wear reduction of 13-fold. Comparing the steady-state wear value to that in standard 28-mm UHMWPE CUPS approaching 75 mm3/year, there was clearly a three-orders-of-magnitude wear superiority in favor of ceramic cups.
    [Abstract] [Full Text] [Related] [New Search]