The Journal of Arthroplasty
Volume 27, Issue 6 , Pages 934-939, June 2012

Shortening Cemented Femoral Implants:

An In Vitro Investigation to Quantify Exeter Femoral Implant Rotational Stability vs Simulated Implant Length

  • Lance J. Wilson, BE Mech, ME Sc, PhD
    • ,
  • John A. Roe, BSc, MBBS
    • ,
  • Mark J. Pearcy, BSc, PhD, Deng
    • ,
  • Ross W. Crawford, MBBS, D Phil Oxon

      Affiliations

    • Corresponding Author InformationReprint requests: Ross W. Crawford, MBBS, D Phil Oxon, Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia Orthopaedic Research Unit, Level 5, Clinical Sciences Building, The Prince Charles Hospital, Rode Road, Chermside Queensland, 4032 Australia.

Received 7 August 2011; accepted 12 October 2011. published online 07 December 2011.

Abstract 

The Exeter stems vary in length from 90 to 150 mm. The shorter stems generally have lower offsets. The purpose of this study was to determine if length of stem, with fixed offset, affected rotational stability. Mechanical testing was carried out on 10 implant-cement constructs with 2 loading profiles, rising from chair and stair climbing, at different simulated implant lengths using purpose-built apparatus. This paper presents a mechanism for clinically observed rotational stability and explains the mechanical characteristics required for rotational stability in Exeter femoral stems.

Keywords: femoral implant, rotational stability, preclinical testing, implant design

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 The Conflict of Interest statement associated with this article can be found at doi:10.1016/j.arth.2011.10.012.

PII: S0883-5403(11)00560-2

doi:10.1016/j.arth.2011.10.012

The Journal of Arthroplasty
Volume 27, Issue 6 , Pages 934-939, June 2012

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