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International Orthopaedics

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01-11-2016 | Original Paper

Radiological identification of Zweymüller-type femoral stem prosthesis in revision cases

Authors: Saverio Affatato, Saverio Comitini, Matteo Fosco, Aldo Toni, Domenico Tigani

Published in: International Orthopaedics | Issue 11/2016

Abstract

Introduction

Since 1979 the number of patients treated with femoral stems has continued to grow, as well as the number of stems with features similar to the Zweymüller prosthesis produced by different companies. Identification can be problematic in case requiring revision. In the present paper, we present an overview of morphometric differences between the different stem designs, which can be useful for radiologic identification in revision cases.

Methods

By doing some research on the Internet of specialized sites and worldwide literature, we searched for all femoral stems agreeing with Zweymüller principles (cementless, straight, tapered, rectangular cross-sectioned femoral stems).

Results

We found 26 different stems from different companies producing or having produced in the past the Zweymüller-type femoral stems for hip prosthesis.

Discussion

Accurate preoperative identification of the Zweymüller femoral stem type may be of critical importance to eventual outcomes following revision surgery. Each manufacturer has different instruments specific to the removal of their primary implants, and ensuring they are available can simplify the revision procedure significantly. Exact pre-operative planning is also necessary for selecting the correct ball head in cases where a stem is well-fixed and can be left in situ. The commonly used notation "Eurocone 12/14" provides no information about the actual taper angle. Whenever the stem is left in situ, the exact specifications of the taper must therefore be obtained from the manufacturer in order to use a metal sleeve that precisely fits it and the ball head. Failure to do so may result in severe complications, such as metallosis. In cases where it is not possible to identify the taper angle, the surgeon may even consider removal of the stem, though this significantly increases the surgical procedure's invasiveness. Only a single, uniform standard taper, such as that offered until 1994 by CeramTec, can solve these issues in the future.

Conclusion

The survival rate of the Zweymüller stems after ten years was 96 % and the complication rate was very low. Pre-operative identification of the femoral implant is of considerable importance for planning and correctly implementing revision procedures.

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Title: Radiological identification of Zweymüller-type femoral stem prosthesis in revision cases
Authors: Saverio Affatato
Saverio Comitini
Matteo Fosco
Aldo Toni
Domenico Tigani
Publication date: 01-11-2016
Publisher: Springer Berlin Heidelberg
Published in: International Orthopaedics / Issue 11/2016
Print ISSN: 0341-2695
Electronic ISSN: 1432-5195
DOI: https://doi.org/10.1007/s00264-016-3141-3

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Radiological identification of Zweymüller-type femoral stem prosthesis in revision cases

Abstract

Introduction

Methods

Results

Discussion

Conclusion

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Introduction

Methods

Results

Discussion

Conclusion

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