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A procedure to refine joint kinematic assessments: Functional Alignment

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  • Kevin Ball
  • Thomas Greiner

Abstract

Functional Alignment is a new method to determine the orientation of a joint's primary rotational axis and the associated movement. It employs three unique concepts. First, data analyses are based upon assessment of spatial positions and not upon movement in a time sequence. Second, analyses are conducted on derived joint rotation matrices instead of tracked markers. This permits reanalysis of published biomechanical results and, therefore, provides a basis for unifying perspectives among different research efforts. Finally, the independent perspectives of the move and base segments require the analysis to use two unique descriptors of the joint axis orientation. These two mathematically necessary descriptors are also shown to be obtainable without reference to the original marker data. The combination of these approaches provides opportunities for additional comparisons of kinematic joint features that have been heretofore underappreciated.

Suggested Citation

  • Kevin Ball & Thomas Greiner, 2012. "A procedure to refine joint kinematic assessments: Functional Alignment," Computer Methods in Biomechanics and Biomedical Engineering, Taylor & Francis Journals, vol. 15(5), pages 487-500.
    • Handle: RePEc:taf:gcmbxx:v:15:y:2012:i:5:p:487-500
    DOI: 10.1080/10255842.2010.545821
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    References listed on IDEAS

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    1. Thomas M. Greiner & Kevin A. Ball, 2009. "Statistical analysis of the three dimensional joint complex," Computer Methods in Biomechanics and Biomedical Engineering, Taylor & Francis Journals, vol. 12(2), pages 185-195.
    2. M.S. Andersen & M. Damsgaard & B. MacWilliams & J. Rasmussen, 2010. "A computationally efficient optimisation-based method for parameter identification of kinematically determinate and over-determinate biomechanical systems," Computer Methods in Biomechanics and Biomedical Engineering, Taylor & Francis Journals, vol. 13(2), pages 171-183.
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