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Subsidence of a cementless femoral component influenced by body weight and body mass index

International Orthopaedics volume 36, pages 941–947 (2012)Cite this article

Abstract

Purpose

This trial was designed to evaluate the impact of physical characteristics such as body mass index, body weight and height on distal stem migration of a cementless femoral component, as the influence of obesity on the outcome of THA is still debated in literature and conflicting results have been found.

Methods

In this retrospective cohort study, migration patterns for 102 implants were analysed using the Einzel-Bild-Roentgen-Analyse (EBRA-FCA, femoral component analysis). In all cases the Vision 2000 stem was implanted and combined with the Duraloc acetabular component (DePuy, Warsaw, Indiana).

Results

The mean follow-up was 93 months. EBRA-FCA evaluations revealed a mean subsidence of 1.38 mm after two years, 2.06 mm after five and 2.24 mm after seven years. Five stems loosened aseptically. Correlation between increased migration over the whole period and aseptic loosening was highly significant (p < 0.001). Surgical technique had a significant influence on migration and stem stability (p = 0.002) but physical patient characteristics such as body weight over 75 kg and height over 165 cm also significantly influenced stem subsidence towards progressive migration (p = 0.001, p < 0.001). However, a high BMI did not trigger progressive stem migration (p = 0.87). Being of the male gender raised the odds for increased migration (p = 0.03).

Conclusion

Physical characteristics such as body weight and height showed significant influence on migration patterns of this cementless femoral component. The operating surgeon should be aware that body weight above 75 kg and height over 165 cm may trigger increased stem migration and the surgeon should aim to fit these prostheses as tightly as possible. However this study demonstrates that a high BMI does not trigger progressive stem migration. Further investigations are needed to confirm our findings.

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Authors and Affiliations

  1. University Clinic of Orthopaedic Surgery, Medical University of Graz, 8036, Graz, Austria

    Christoph Stihsen & Armin Keshmiri

  2. Department of Orthopaedic Surgery, Landeskrankenhaus Stolzalpe, 8852, Stolzalpe, Austria

    Roman Radl

  3. Department of Surgery, Unit for Biomedical Engineering and Computing, Medical University of Graz, 8036, Graz, Austria

    Peter Rehak

  4. Department of Orthopaedic Surgery, Medical University of Vienna, Waehringer Guertel 18–20, 1090, Vienna, Austria

    Reinhard Windhager

Authors
  1. Christoph Stihsen
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  2. Roman Radl
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  3. Armin Keshmiri
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  4. Peter Rehak
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  5. Reinhard Windhager
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Corresponding author

Correspondence to Reinhard Windhager.

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Stihsen, C., Radl, R., Keshmiri, A. et al. Subsidence of a cementless femoral component influenced by body weight and body mass index. International Orthopaedics (SICOT) 36, 941–947 (2012). https://doi.org/10.1007/s00264-011-1360-1

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  • DOI: https://doi.org/10.1007/s00264-011-1360-1

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