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The 6-Year Migration Characteristics of a Hydroxyapatite-Coated Femoral Stem:

A Radiostereometric Analysis Study

  • Stuart A. Callary, BAppSc

      Affiliations

    • Discipline of Orthopaedics and Trauma, University of Adelaide and Department of Orthopaedics and Trauma, Royal Adelaide Hospital, Adelaide, South Australia, Australia
    • ,
  • David G. Campbell, BM BS, PhD, FRACS

      Affiliations

    • Orthopaedic Unit, Repatriation General Hospital, Adelaide, South Australia, Australia
    • Corresponding Author InformationReprint requests: David Campbell, PhD, FRACS, Consultant Surgeon Orthopaedic Unit, Repatriation General Hospital, Adelaide, South Australia, Australia
    • ,
  • Graham E. Mercer, MBBS, FRACS, FAOrthA

      Affiliations

    • Orthopaedic Unit, Repatriation General Hospital, Adelaide, South Australia, Australia
    • ,
  • Kjell G. Nilsson, MD, PhD

      Affiliations

    • Department of Orthopaedics, Umeå University Hospital, Umeå, Sweden
    • ,
  • John R. Field, DVSc, PhD

      Affiliations

    • CORe: Comparative Orthopaedic Research Surgical Facility, Flinders University, Adelaide, South Australia, Australia

Received 25 June 2011; accepted 5 December 2011. published online 24 January 2012.
Corrected Proof

Abstract 

A prospective cohort of 30 patients undergoing primary total hip arthroplasty for treatment of osteoarthritis was enrolled in a study to characterize the migration behavior of a clinically successful cementless stem. At 6 years, the mean subsidence of the stem was 0.63 mm (range, −0.33 to 3.68 mm); the mean rotation into retroversion was 1.41° (range, −1.33° to 7.48°). No stems had additional subsidence of more than 0.25 mm between 6 months and 6 years. The resultant mean subsidence between 2 and 6 years was 0.03 mm, which is below the limit measurable by radiostereometric analysis. The data demonstrate that subsidence of this cementless stem occurs within the first 6 months, after which there is persistent stabilization.

Keywords: total hip arthroplasty, radiostereometric analysis, subsidence, stabilization

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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.2011.12.002.

PII: S0883-5403(11)00655-3

doi:10.1016/j.arth.2011.12.002

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