Annals of Biomedical Engineering

, Volume 44, Issue 5, pp 1685–1697 | Cite as

Surface and Subsurface Analyses of Metal-on-Polyethylene Total Hip Replacement Retrievals

  • Vicky Vuong
  • Maria Pettersson
  • Cecilia Persson
  • Sune Larsson
  • Kathryn GrandfieldEmail author
  • Håkan Engqvist


Metal-on-polyethylene (MoP) articulations are one of the most reliable implanted hip prostheses. Unfortunately, long-term failure remains an obstacle to the service life. There is a lack of higher resolution research investigating the metallic surface component of MoP hip implants. This study investigates the surface and subsurface features of metallic cobalt chromium molybdenum alloy (CoCrMo) femoral head components from failed MoP retrievals. Unused prostheses were used for comparison to differentiate between wear-induced defects and imperfections incurred during implant manufacturing. The predominant scratch morphology observed on the non-implanted references was shallow and linear, whereas the scratches on the retrievals consisted of largely nonlinear, irregular scratches of varying depth (up to 150 nm in retrievals and up to 60 nm in reference samples). Characteristic hard phases were observed on the surface and subsurface material of the cast samples. Across all samples, a 100–400 nm thick nanocrystalline layer was visible in the immediate subsurface microstructure. Although observation of the nanocrystalline layer has been reported in metal-on-metal articulations, its presence in MoP retrievals and unimplanted prostheses has not been extensively examined. The results suggest that manufacturing-induced surface and subsurface microstructural features are present in MoP hip prostheses prior to implantation and naturally, these imperfections may influence the in vivo wear processes after implantation.


Hip implant retrievals Cobalt chromium Metal-on-polymer Transmission electron microscopy Biotribology Electron microscopy 



Funding from the European Union’s Seventh Framework Programme (FP7/2007-2013), under Grant Agreement No. GA-310477 is gratefully acknowledged. Funding from the Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery Grant Program and the European Union’s Seventh Framework Programme (FP7/2007-2013), under Grant Agreement No. GA-310477 is gratefully acknowledged. Electron microscopy was performed at the Canadian Centre for Electron Microscopy at McMaster University, a facility supported by NSERC and other government agencies.


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Copyright information

© Biomedical Engineering Society 2015

Authors and Affiliations

  • Vicky Vuong
    • 1
  • Maria Pettersson
    • 2
  • Cecilia Persson
    • 2
  • Sune Larsson
    • 3
  • Kathryn Grandfield
    • 1
    Email author
  • Håkan Engqvist
    • 2
  1. 1.Department of Materials Science and EngineeringMcMaster UniversityHamiltonCanada
  2. 2.Division of Applied Materials Science, Department of Engineering SciencesUppsala UniversityUppsalaSweden
  3. 3.Department of Surgical Sciences-OrthopaedicsUppsala University HospitalUppsalaSweden

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