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New method for measuring acetabular component positioning with EOS imaging: feasibility study on dry bone

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Abstract

Purpose

Malposition of the acetabular cup is the most common cause of total hip arthroplasty (THA) dislocation. The position of a total hip implant is usually analysed on computed tomography (CT) scan. We aim to prove it is possible to measure, with good accuracy, the position of an acetabular cup using the low-dose irradiation (EOS) imaging.

Material and methods

We implanted an acetabular cup in a pelvic dry bone and measured cup anteversion and inclination with scanography. We performed 14 series of EOS acquisitions with different inclination, rotation and pelvic tilt, which were analysed by five observers. Two observers repeated angle measurements. We then calculated measurement inter- and intrareproducibility and accuracy.

Results

Using a confidence interval (CI) of 95 %, inter- and intra-observer reproducibility were ±1.6, and ±1.4°, respectively, for cup inclination; accuracy in comparison with CT was ±2.6°. Using a 95 % CI, inter- and intra-observer reproducibility for cup anteversion were ±2.5° and ±2.3°, respectively. Measurement accuracy compared with CT was ±3.9°.

Conclusion

EOS imaging system is superior to standard radiography in terms of measuring acetabular anteversion and inclination.

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Disclosure of interest

The authors declare that they have no conflicts of interest concerning this article.

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Authors and Affiliations

  1. Department of Orthopaedic and Trauma Surgery, Saint Antoine Hospital, 184 rue du Faubourg Saint Antoine, 75571, Paris cedex 12, France

    Alexandre Journé, Jérome Sadaka, Claire Bélicourt & Alain Sautet

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  1. Alexandre Journé
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  2. Jérome Sadaka
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  3. Claire Bélicourt
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  4. Alain Sautet
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Correspondence to Alexandre Journé.

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Journé, A., Sadaka, J., Bélicourt, C. et al. New method for measuring acetabular component positioning with EOS imaging: feasibility study on dry bone. International Orthopaedics (SICOT) 36, 2205–2209 (2012). https://doi.org/10.1007/s00264-012-1650-2

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  • DOI: https://doi.org/10.1007/s00264-012-1650-2

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