Statistical analysis of the three dimensional joint complex

Thomas M. Greiner and Kevin A. Ball

Computer Methods in Biomechanics and Biomedical Engineering, 2009, vol. 12, issue 2, 185-195

Abstract: Although three-dimensional data capture has become routine, statistical methods that take appropriate advantage of these multivariate data have not been widely developed. Researchers frequently rely on multiple isolated univariate statistical methods in the analysis of a joint's several axes of rotation and their associated motions. This approach reflects an inherent flaw in that it fails to appreciate the unbreakable link among these descriptors. We propose a new analytical perspective. Borrowing from the techniques of geometric morphometrics, data that describe multiple joint axis orientations and the motions about them are converted into a shape, an axis triangle, that is viewable in a three-dimensional space. In this format, multivariate statistical analyses can be conducted using conventional analytical packages. The axis triangle technique represents a significant advance over current analytical approaches in that it provides an encompassing method of appreciating joint rotations, as well as comprehensive consideration of joint function by linking rotational axis orientations with associated motion patterns.

Date: 2009
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DOI: 10.1080/10255840802372060

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