Nanoindentation Results from Direct Molded vs. Machined UHMWPE Tibial Bearings

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Nanoindentation has been used to compare the micromechanical properties of direct molded vs. machined bearing surfaces on UHMWPE tibial components. Differences in micromechanical properties (hardness and elastic storage modulus) were observed between these two types of bearing surfaces, and are believed to result from (1) differences in surface roughness, and (2) differences in morphology of the UHMWPE. Clinical studies of in-vivo UHMWPE wear rates in acetabular cups have reported differences between direct molded and machined bearings.{sup 1,2} Other studies of retrieved components have reported differences as well.{sup 3} Variations in surface characteristics (rather than bulk properties) may cause these differences ... continued below

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Higgins, J.E.; Joy, D.C.; Pharr, G.M.; Schmidt, M.A. & Swadener, J.G. November 13, 1999.

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Nanoindentation has been used to compare the micromechanical properties of direct molded vs. machined bearing surfaces on UHMWPE tibial components. Differences in micromechanical properties (hardness and elastic storage modulus) were observed between these two types of bearing surfaces, and are believed to result from (1) differences in surface roughness, and (2) differences in morphology of the UHMWPE. Clinical studies of in-vivo UHMWPE wear rates in acetabular cups have reported differences between direct molded and machined bearings.{sup 1,2} Other studies of retrieved components have reported differences as well.{sup 3} Variations in surface characteristics (rather than bulk properties) may cause these differences in wear behavior. This study's objective was to compare micro-mechanical interactions at the bearing surfaces of direct molded components with those of machined components. A nanoindenter was used to perform instrumented microindentations on these surfaces. Da ta was analyzed to study both the load vs. displacement behavior during the indentation cycle, and also to measure the elastic storage modulus and hardness as a function of depth.

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OSTI as DE00014617

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  • Report No.: ORNL/CP-104808
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 14617
  • Archival Resource Key: ark:/67531/metadc622048

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • November 13, 1999

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  • June 16, 2015, 7:43 a.m.

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  • Jan. 19, 2016, 8:24 p.m.

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Higgins, J.E.; Joy, D.C.; Pharr, G.M.; Schmidt, M.A. & Swadener, J.G. Nanoindentation Results from Direct Molded vs. Machined UHMWPE Tibial Bearings, article, November 13, 1999; Tennessee. (digital.library.unt.edu/ark:/67531/metadc622048/: accessed July 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.