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Does Hip Resurfacing Require Larger Acetabular Cups Than Conventional THA?

Clinical Orthopaedics and Related Research volume 467, pages 923–928 (2009)Cite this article

Abstract

Hip resurfacing is femoral bone preserving, but there is controversy regarding the amount of bone removed at the acetabular side. We therefore compared the implanted acetabular cup sizes in primary THAs between two resurfacing devices and a conventional press-fit cup using a series of 2134 THAs (Allofit® cup 1643 hips, Durom® Hip Resurfacing 249 hips, and Birmingham Hip® Resurfacing 242 hips). The effects of patient demographics and cup position in the horizontal plane also were assessed. After controlling for gender, patients were matched for height, weight, body mass index, and age. The mean size for Allofit® cups was smaller than the sizes for Durom® and Birmingham Hip® Resurfacing cups in women (49.9 mm, 51.6 mm, 52.3 mm, respectively) and men (55.1 mm, 56.7 mm, 57.8 mm; respectively). Although patient height was associated with the implanted cup size, the cup position in the horizontal plane had no effect on the size used. Larger cups were used with hip resurfacing than for THA with a conventional press-fit cup. However, additional studies are needed to determine whether these small differences have any clinical implications in the long term. The association of cup size and patient height should be considered in future studies comparing component sizes among different implants.

Level of Evidence: Level III, therapeutic study. See the Guidelines for Authors for a complete description of levels of evidence.

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Acknowledgments

We thank Franco M. Impellizzeri for help with the study.

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Affiliations

  1. Department of Orthopaedic Surgery, Schulthess Clinic, Lengghalde 2, 8008, Zurich, Switzerland

    Florian D. Naal MD, Otmar Hersche MD, Urs Munzinger MD & Michael Leunig MD

  2. M.E. Müller Foundation of North America Hip Fellow at Schulthess Clinic, Zurich, Switzerland

    Michael S. H. Kain MD

  3. University of Berne, Berne, Switzerland

    Michael Leunig MD

Authors
  1. Florian D. Naal MD
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  2. Michael S. H. Kain MD
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  3. Otmar Hersche MD
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  4. Urs Munzinger MD
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  5. Michael Leunig MD
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Corresponding author

Correspondence to Florian D. Naal MD.

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Each author certifies that he or she has no commercial associations (eg, consultancies, stock ownership, equity interest, patent/licensing arrangements, etc) that might pose a conflict of interest in connection with the submitted article.

Each author certifies that his or her institution has approved the human protocol for this investigation, that all investigations were conducted in conformity with ethical principles of research, and that informed consent for participation in the study was obtained.

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Naal, F.D., Kain, M.S.H., Hersche, O. et al. Does Hip Resurfacing Require Larger Acetabular Cups Than Conventional THA?. Clin Orthop Relat Res 467, 923–928 (2009). https://doi.org/10.1007/s11999-008-0689-2

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  • DOI: https://doi.org/10.1007/s11999-008-0689-2

Keywords

  • Femoral Component
  • Acetabular Component
  • Acetabular Bone
  • Patient Height
  • Acetabular Side