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Accuracy of a computer-assisted navigation system in resurfacing hip arthroplasty

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Abstract

We developed a method to assess the accuracy of an image-free resurfacing hip arthroplasty navigation system in a proximal femur with normal and abnormal anatomy. A phantom lower limb allowed deformation in varus/valgus and ante-retroversion. At specific points during the simulated surgical procedure, information was compared between a digital caliper and the computer navigation system angular measurements. Repeated serial tests were undertaken. In the setting of normal anatomical alignment of the proximal femur, the mean error of the system characterised as the difference between the measured computer navigation and caliper angles was 0.6° in the frontal plane and 3.4° in the lateral plane. In the setting of abnormal anatomical alignment, the mean error was 0.4° in the frontal plane and 2.1° in the lateral plane. This is the first study designed to assess the accuracy of a femoral navigation system for resurfacing hip arthroplasty in normal settings and in the presence of angular deformity. The study demonstrates satisfactory in-vitro accuracy.

Résumé

Nous avons développé pour le resurfaçage de la hanche une méthode d’évaluation de la navigation sans image au niveau du fémur proximal sur des fémurs normaux et anormaux. Un fantôme de membre inférieur montrant des déformations en varus et en valgus ainsi qu’en anteversion a été utilisé. Dans le cadre d’un fémur normalement aligné, l’erreur moyenne est caractérisée par la différence entre la mesure de la navigation et l’angle mesuré par le gonomètre de 0,6° dans le plan frontal, de 3,4° dans le plan profil. Dans le cadre d’un fémur anormalement aligné, l’erreur moyenne a été de 0,4° dans le plan frontal et de 2,1° pour le profil. Il s’agit de la première étude montrant l’intérêt de la navigation lors du resurfaçage de la hanche qu’il s’agisse d’un fémur normal ou qu’il s’agisse d’un fémur déformé. Cette étude in vitro est satisfaisante.

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Acknowledgements

The authors wish to thank Vinod Suresh for statistical analysis assistance and Lawrence Anderson for preparation of the technical drawings.

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Authors and Affiliations

  1. Department of Orthopaedic Surgery, Middlemore Hospital, South Auckland Clinical School, University of Auckland, Private Bag 93311, Auckland, New Zealand

    R. P. Pitto

  2. Bioengineering Institute, University of Auckland, Auckland, New Zealand

    R. P. Pitto, S. Malak & I. A. Anderson

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  1. R. P. Pitto
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  2. S. Malak
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  3. I. A. Anderson
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Correspondence to R. P. Pitto.

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Pitto, R.P., Malak, S. & Anderson, I.A. Accuracy of a computer-assisted navigation system in resurfacing hip arthroplasty. International Orthopaedics (SICOT) 33, 391–395 (2009). https://doi.org/10.1007/s00264-008-0644-6

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  • DOI: https://doi.org/10.1007/s00264-008-0644-6

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