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Osteointegration of a modular metal-polyethylene surface gliding finger implant: a case report

  • Handsurgery
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Archives of Orthopaedic and Trauma Surgery Aims and scope Submit manuscript

Abstract

Introduction

Primary press fit and secondary osteointegration is a precondition for component anchoring in articular surface replacements, also in the case of proximal interphalangeal (PIP) joint. Nevertheless, many existing prostheses for the PIP joint have failed to show sufficient osteointegration. CapFlex-PIP© implant is a modular metal-polyethylene surface replacement for the PIP joint consisting of a proximal and distal component each having a titanium pore backside, which allows secondary osteointegration at the bone-implant interface. To evaluate osseous integration of this implant, we report a histological analysis of an explantation of a CapFlex-PIP© finger implant.

Case presentation

We present a case of a removed CapFlex-PIP© implant due to a soft tissue complication in an 84-year-old woman. The patient received bisphosphonate medication as treatment for osteoporosis. For the histological analysis, the bone-implant contact (BIC) was measured on all stained sections using a Zeiss Axioplan microscope. The summated BIC was 40.7 % for the proximal component and 46.5 % for the distal component of the implant. Histology showed that the implant was in direct contact with the bone at various locations, with no signs of wear or degradation.

Conclusions

This case demonstrates successful osteointegration of the CapFlex-PIP© implant. Both components of the investigated implant show osseous integration to an extent which is comparable to that of other load-bearing and articulating implants at different locations in the human body.

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Acknowledgments

We would like to thank Dr Meryl Clarke for the copy-editing of this manuscript and Mrs Andrea Altwegg for organizing the implant exchange and primary fixation of the components after explantation.

Author information

Authors and Affiliations

  1. Department of Hand Surgery, Schulthess Clinic, Lengghalde 2, 8008, Zurich, Switzerland

    Stephan F. Schindele

  2. AO Research Institute, AO Foundation, Davos, Switzerland

    Christoph M. Sprecher

  3. Department of Anatomy II, Ludwig-Maximilians-University of Munich, Munich, Germany

    Stefan Milz

  4. Department of Teaching, Research and Development, Schulthess Clinic, Zurich, Switzerland

    Stefanie Hensler

Authors
  1. Stephan F. Schindele
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  2. Christoph M. Sprecher
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  3. Stefan Milz
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  4. Stefanie Hensler
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Corresponding author

Correspondence to Stephan F. Schindele.

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Conflict of interest

The senior author (SFS) received royalties from the KLS Martin Group, Tuttlingen, Germany. KLS Martin Group, Tuttlingen, Germany payed the expenses of the histological investigation and received a bill from AO Research Institute, Davos, Switzerland. The senior author (SFS) and his family as well as this institution did not receive any further financial payments or benefits from any other commercial entity related to the subject of this article and preparation of the manuscript.

Funding

This research received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors.

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Schindele, S.F., Sprecher, C.M., Milz, S. et al. Osteointegration of a modular metal-polyethylene surface gliding finger implant: a case report. Arch Orthop Trauma Surg 136, 1331–1335 (2016). https://doi.org/10.1007/s00402-016-2526-5

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  • DOI: https://doi.org/10.1007/s00402-016-2526-5

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