Repeatability and Accuracy of Ankle Centre Location Estimates Using a Biaxial Joint Model (original) (raw)

Abstract

In conventional total knee replacement (TKR) surgery, a significant fraction of implants have varus/valgus alignment errors large enough to reduce the lifespan of the implant, so we are developing a more accurate computerassisted procedure aimed at reducing the standard deviation (SD) of the implant procedure. In this study we introduce a new method of locating the ankle joint centre (AJC) using a biaxial model (BM), and determine the accuracy and repeatability of this protocol compared to a digitization method and a spherefitting method used in a current computer-assisted procedure. Repeated in vivo measurements performed by a single operator were obtained from five normal subjects (450 measurements) using the three methods of AJC location. Based on these experiments we estimate the varus/valgus SD of defining the tibial mechanical axis in the frontal plane for the tested population to be 0.28° for the spherical model, 0.17° for the biaxial model, and 0.11° for the conventional digitizing point probe. The mean joint centre locations found by the motionbased models are significantly medial and anterior to the point probe centre.

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References

  1. van den Bogert AJ, Smith GD, Nigg BM: In Vivo Determination of the Anatomical Axes of the Ankle Joint Complex: an Optimization Approach. Journal of Biomechanics 27(12), 1994. pp 1477.1488.
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Authors and Affiliations

  1. Department of Mechanical Engineering, University of British Columbia, Vancouver, BC, Canada
    Cameron A. Shute & Antony J. Hodgson

Authors

  1. Cameron A. Shute
  2. Antony J. Hodgson

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Editors and Affiliations

  1. Image Sciences Institute, University Medical Center Utrecht, Heidelberglaan 100, 3584 CX, Utrecht, The Netherlands
    Wiro J. Niessen & Max A. Viergever &

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© 2001 Springer-Verlag Berlin Heidelberg

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Shute, C.A., Hodgson, A.J. (2001). Repeatability and Accuracy of Ankle Centre Location Estimates Using a Biaxial Joint Model. In: Niessen, W.J., Viergever, M.A. (eds) Medical Image Computing and Computer-Assisted Intervention – MICCAI 2001. MICCAI 2001. Lecture Notes in Computer Science, vol 2208. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-45468-3\_146

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