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Is the acetabular cup orientation after total hip arthroplasty on a two dimension or three dimension model accurate?

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Abstract

Purpose

Malposition of the acetabular component in total hip arthroplasty (THA) is a common surgical problem that can lead to hip dislocation, reduced range of motion and may result in early loosening. The aim of this study is to validate the accuracy and reproducibility of a single x-ray image based 2D/3D reconstruction technique in determining cup inclination and anteversion against two different computer tomography (CT)-based measurement techniques.

Methods

Cup anteversion and inclination of 20 patients after cementless primary THA was measured on standard antero-posterior (AP) radiographs with the help of the single x-ray 2D/3D reconstruction program and compared with two different 3D CT-based analyses [Ground Truth (GT) and MeVis (MV) reconstruction model].

Results

The measurements from the single x-ray 2D/3D reconstruction technique were strongly correlated with both types of CT image-processing protocols for both cup inclination [R²=0.69 (GT); R²=0.59 (MV)] and anteversion [R²=0.89 (GT); R²=0.80 (MV)].

Conclusions

The single x-ray image based 2D/3D reconstruction technique is a feasible method to assess cup position on postoperative x-rays. CT scans remain the golden standard for a more complex biomechanical evaluation when a lower tolerance limit (+/-2 degrees) is required.

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Acknowledgments

This work was partially supported by the Swiss National Science Foundation through the project NCCR-CO-ME.

Conflict of interest

The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Orthopaedic Department, University of Regensburg, Regensburg, Germany

    Benjamin Craiovan, Tobias Renkawitz, Markus Weber & Joachim Grifka

  2. Institute for Surgical Technology and Biomechanics (ISTB), University of Bern, Bern, Switzerland

    Lutz Nolte & Guoyan Zheng

Authors
  1. Benjamin Craiovan
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  2. Tobias Renkawitz
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  3. Markus Weber
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  4. Joachim Grifka
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  5. Lutz Nolte
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  6. Guoyan Zheng
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Corresponding author

Correspondence to Benjamin Craiovan.

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Craiovan, B., Renkawitz, T., Weber, M. et al. Is the acetabular cup orientation after total hip arthroplasty on a two dimension or three dimension model accurate?. International Orthopaedics (SICOT) 38, 2009–2015 (2014). https://doi.org/10.1007/s00264-014-2336-8

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  • DOI: https://doi.org/10.1007/s00264-014-2336-8

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