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Reproducibility of a new method for measuring lowering and medialisation of the humerus after reverse shoulder arthroplasty

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Abstract

Background

Reverse shoulder arthroplasty (RSA) requires lowering the humerus and medialisation of the centre of rotation. Several techniques based on standard X-rays are available in the literature. The aim of this study was to expose and validate a new technique for measuring these parameters.

Materials and methods

Radiographic data of 20 patients were included. Three observers examined each X-rays three times to establish the inter- and intra-reproducibility of each technique (Jobin, Renaud and our method).

Results

Intra-observer reproducibility was between 0.10 and 0.94. The best intra-observer intraclass correlation coefficient (ICC) was obtained using Renaud’s and our techniques. The inter-observer reproducibility was between 0.37 and 0.74. The best inter-observer ICC was obtained with our technique.

Discussion

We describe a reliable and reproducible method to evaluate lowering and medialisation of the humerus after RSA. This technique may allow determine the optimal threshold of lengthening after RSA.

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Authors and Affiliations

  1. Orthopaedic Department, Reims Teaching Hospital, 45 rue Cognacq-Jay, 51092, Reims, France

    Axel Marcoin, Antoine Ferrier, Laurent Blasco, Paul De Boissieu, Cécile Nerot & Xavier Ohl

Authors
  1. Axel Marcoin
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  2. Antoine Ferrier
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  3. Laurent Blasco
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  4. Paul De Boissieu
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  5. Cécile Nerot
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  6. Xavier Ohl
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Corresponding author

Correspondence to Xavier Ohl.

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On behalf of all authors, the corresponding author states that there is no conflict of interest.

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This article does not concern studies involving human participants or animals performed by any of the authors.

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Marcoin, A., Ferrier, A., Blasco, L. et al. Reproducibility of a new method for measuring lowering and medialisation of the humerus after reverse shoulder arthroplasty. International Orthopaedics (SICOT) 42, 141–147 (2018). https://doi.org/10.1007/s00264-017-3510-6

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  • DOI: https://doi.org/10.1007/s00264-017-3510-6

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