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

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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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Acknowledgments

The authors would like to thank Luigi Lena (Istituto Ortopedico Rizzoli) for his help with the illustrations, Ms Enza Scifo for her help with the English language, and Ing. Paolo Dalla Pria for his help with technical concepts.

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Authors and Affiliations

  1. Laboratorio di Tecnologia Medica, Istituto Ortopedico Rizzoli, Via di Barbiano, 1/10, 40136, Bologna, Italy

    Saverio Affatato & Aldo Toni

  2. Unità Operativa Complessa di Ortopedia e Traumatologia, Ospedale Maggiore, Bologna, Italy

    Saverio Comitini & Domenico Tigani

  3. Chirurgia di Revisione della protesi d’anca e sviluppo nuovi impianti, Istituto Ortopedico Rizzoli, Bologna, Italy

    Matteo Fosco

  4. Traumatologia e Chirurgia Protesica e dei Reimpianti di Anca e di Ginocchio, Istituto Ortopedico Rizzoli, Bologna, Italy

    Aldo Toni

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  1. Saverio Affatato
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  2. Saverio Comitini
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Correspondence to Saverio Affatato.

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Affatato, S., Comitini, S., Fosco, M. et al. Radiological identification of Zweymüller-type femoral stem prosthesis in revision cases. International Orthopaedics (SICOT) 40, 2261–2269 (2016). https://doi.org/10.1007/s00264-016-3141-3

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  • DOI: https://doi.org/10.1007/s00264-016-3141-3

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