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Archives of Orthopaedic and Trauma Surgery
Published in: Archives of Orthopaedic and Trauma Surgery 5/2013

01-05-2013 | Hip Arthroplasty

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

Authors: Christoph Stihsen, Christopher Rath, Roman Radl, Ali A. Saalabian, Wilfried Materna, Peter Rehak, Reinhard Windhager

Published in: Archives of Orthopaedic and Trauma Surgery | Issue 5/2013

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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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Metadata
Title
Early migration characteristics of a 180° porous-coated cup with 1-mm press fit
Authors
Christoph Stihsen
Christopher Rath
Roman Radl
Ali A. Saalabian
Wilfried Materna
Peter Rehak
Reinhard Windhager
Publication date
01-05-2013
Publisher
Springer-Verlag
Published in
Archives of Orthopaedic and Trauma Surgery / Issue 5/2013
Print ISSN: 0936-8051
Electronic ISSN: 1434-3916
DOI
https://doi.org/10.1007/s00402-013-1713-x

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