The Journal of Arthroplasty
Volume 27, Issue 2 , Pages 238-245.e1, February 2012

Interface Micromotion of Uncemented Femoral Components from Postmortem Retrieved Total Hip Replacements

  • Kenneth A. Mann, PhD

      Affiliations

    • SUNY Upstate Medical University, Syracuse, New York
    • Corresponding Author InformationReprint requests: Kenneth A. Mann, PhD, Department of Orthopedic Surgery, SUNY Upstate Medical University, 3216 Institute for Human Performance, 750 East Adams Street, Syracuse, New York 13210.
    • ,
  • Mark A. Miller, MS

      Affiliations

    • SUNY Upstate Medical University, Syracuse, New York
    • ,
  • Peter A. Costa, BS

      Affiliations

    • SUNY Upstate Medical University, Syracuse, New York
    • ,
  • Amos Race, PhD

      Affiliations

    • SUNY Upstate Medical University, Syracuse, New York
    • ,
  • Timothy H. Izant, MD

      Affiliations

    • SUNY Upstate Medical University, Syracuse, New York
    • Syracuse Orthopedic Specialists, Syracuse, New York

Received 10 December 2010; accepted 14 April 2011. published online 04 July 2011.

Abstract 

Axial torsional loads representative of gait and stair climbing conditions were applied to transverse sections of 8 uncemented postmortem retrievals and a high-resolution imaging system with digital image correlation was used to measure local micromotion along the bone-implant interface. For 7 components that were radiographically stable, there was limited micromotion for gait loading (1.42 ± 1.33 μm) that increased significantly (P = .0032) for stair climb loading (7.32 ± 9.96 μm). A radiographically loose component had motions on the order of 2.3 mm with gait loading. There was a strong inverse relationship between the amount of bone-implant contact (contact fraction) (P = .001) and micromotion. The uncemented components had greater contact fraction (41.8% ± 14.4% vs 11.5% ± 10.2%, P = .0033) and less median micromotion (0.81 ± 0.79 μm vs 28.8 ± 51.1 μm) compared to a previously reported study of cemented retrievals.

Keywords: micromotion, uncemented stem, cemented stem, implant fixation, postmortem retrieval

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 Supplementary material available at www.arthroplastyjournal.org.

 The Conflict of Interest statement associated with this article can be found at doi:10.1016/j.arth.2011.04.018.

PII: S0883-5403(11)00202-6

doi:10.1016/j.arth.2011.04.018

The Journal of Arthroplasty
Volume 27, Issue 2 , Pages 238-245.e1, February 2012

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