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Comparison of three formal methods used to estimate the functional axis of rotation: an extensive analysis performed on the knee joint

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  • Francesca Colle
  • Nicola Lopomo
  • Andrea Visani
  • Stefano Zaffagnini
  • Maurilio Marcacci

Abstract

Estimating the main axis of rotation (AoR) of a human joint represents an important issue in biomechanics. This study compared three formal methods used to estimate functional AoR, namely a cylindrical fitting method, a mean helical axis transformation, and a symmetrical axis approach. These methods were tested on 106 subjects undergoing navigated total knee arthroplasty. AoR orientation in 3D and in the frontal and coronal planes provided by each method was compared to the transepicondylar axis direction. Although all the methods resulted effective, significant differences were identified among them, relatively to the orientation in 3D and in the frontal plane projection. This was probably due to the presence of secondary rotations during the first degrees of knee flexion.

Suggested Citation

  • Francesca Colle & Nicola Lopomo & Andrea Visani & Stefano Zaffagnini & Maurilio Marcacci, 2016. "Comparison of three formal methods used to estimate the functional axis of rotation: an extensive analysis performed on the knee joint," Computer Methods in Biomechanics and Biomedical Engineering, Taylor & Francis Journals, vol. 19(5), pages 484-492, April.
    • Handle: RePEc:taf:gcmbxx:v:19:y:2016:i:5:p:484-492
    DOI: 10.1080/10255842.2015.1042464
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    References listed on IDEAS

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    1. I. Reichl & U. Leichtle & A. Lorenz, 2014. "Functionally computed flexion axis reduces kinematic interspecimen variation in experiments," Computer Methods in Biomechanics and Biomedical Engineering, Taylor & Francis Journals, vol. 17(S1), pages 126-127, August.
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