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Early migration characteristics of a 180° porous-coated cup with 1-mm press fit

  • Hip Arthroplasty
  • Published:
Archives of Orthopaedic and Trauma Surgery Aims and scope Submit manuscript

Abstract

Introduction

Evaluation of early cup movement is an important diagnostic tool to predict the likelihood of long-term implant loosening and clinical failure. The investigated cementless cup is clinically proven over 10 years, but there is a paucity of information that accurately describes the migration characteristics of this component.

Materials and methods

We retrospectively analysed the clinical outcome and migration behaviour of 60 Pinnacle 100 shells after an average 3.8-year follow-up (range 2.1–5.4 years). For migration measurement, EBRA (Einzel-Bild-Röntgen-Analyse) digital software was applied. Clinical assessment was performed using the HHS, the UCLA score and the SF-36 health survey.

Results

The clinical outcome showed excellent results with a mean HHS of 95.4 (SD 7.1) and mean UCLA of 6.9 (SD 1.3). All implants were radiologically stable within the observation period and none of the cups was at risk for aseptical loosening. EBRA analysis revealed a mean total migration of 1.4 mm (SD 0.9) (95 % CI 1.1–1.6) at 3 years. Eight cups migrated more than 1 mm within the first three postoperative months, thereafter the migration curves flattened down.

Conclusion

Surgeons may expect to find a variable amount of early migration when using the Pinnacle cup. To our knowledge, these are the first results, which show an early “impaction” of a cementless cup, followed by subsequent osseointegration. We believe that an appropriate long-term outcome of the investigated cup is ensured. The data of the present investigation will provide clinicians with useful baseline information with which to compare new cup designs.

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Acknowledgments

The study was designed and performed as an academic investigation without any external or industrial funding sources.

Conflict of interest

The authors declare that they have no conflict of interest.

Author information

Authors and Affiliations

  1. Department of Orthopaedic Surgery, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria

    Christoph Stihsen & Reinhard Windhager

  2. Department of Orthopaedic Surgery, Medical University of Graz, 8036, Graz, Austria

    Christopher Rath & Wilfried Materna

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

    Roman Radl

  4. Department of Plastic and Recontructive Surgery, Medical Institution Rudolfstiftung, Juchgasse 25, 1030, Vienna, Austria

    Ali A. Saalabian

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

    Peter Rehak

Authors
  1. Christoph Stihsen
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  2. Christopher Rath
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  3. Roman Radl
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  4. Ali A. Saalabian
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  5. Wilfried Materna
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  7. Reinhard Windhager
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Correspondence to Christoph Stihsen.

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Stihsen, C., Rath, C., Radl, R. et al. Early migration characteristics of a 180° porous-coated cup with 1-mm press fit. Arch Orthop Trauma Surg 133, 707–712 (2013). https://doi.org/10.1007/s00402-013-1713-x

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  • DOI: https://doi.org/10.1007/s00402-013-1713-x

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