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Insertion of the Ascension PyroCarbon PIP total joint in 152 human cadaver fingers: analysis of implant positions and malpositions

  • Handsurgery
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A Correction to this article was published on 10 November 2017

This article has been updated

Abstract

Introduction

The Ascension PyroCarbon proximal interphalangeal (PIP) total joint is used in osteoarthritis of the PIP finger joint. No systematic study of the positioning of this prosthesis and its relation to proximal and middle phalanx morphology has yet been reported.

Materials and methods

Positioning of the proximal and distal components of the Ascension PyroCarbon PIP total joint was radiographically analysed in 152 human cadaver fingers.

Results

Ideal implant position in the axis of the phalanx and with contact of the implant head with bone in both the frontal and sagittal planes was seen in only 33 % of the phalanges. Implant malposition was observed in the remaining 67 % of phalanges.

Conclusion

The current design of the Ascension PyroCarbon PIP total joint can lead to malpositioning that we attribute to its incomplete accommodation of the morphology of the proximal and middle phalanx, the surgical challenges the design poses, or both acting together.

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Change history

  • 10 November 2017

    In the experimental study the distal component of the Ascension PyroCarbon proximal interphalangeal total joint prosthesis was implanted 180° rotated. Figures 2–5 show the implant malpositions. The methods, results, and conclusion of the study were not affected by this.

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Acknowledgments

We would like to thank Christopher Ritter, PhD, for assistance and preparation of the manuscript. This research received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors.

Conflict of interest

All named authors hereby declare that they have no conflicts of interest to disclose. The study was approved by the university’s ethics committee and conformed to the Declaration of Helsinki.

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Correspondence to Bernd Hohendorff.

Additional information

A correction to this article is available online at https://doi.org/10.1007/s00402-017-2800-1.

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Hohendorff, B., Zhang, W., Burkhart, K.J. et al. Insertion of the Ascension PyroCarbon PIP total joint in 152 human cadaver fingers: analysis of implant positions and malpositions. Arch Orthop Trauma Surg 135, 283–290 (2015). https://doi.org/10.1007/s00402-014-2133-2

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  • DOI: https://doi.org/10.1007/s00402-014-2133-2

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