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In this paper we propose a new method of classification, which goes beyond the frontal plane projection of the spine, to describe the 3-D shape of a scoliotic spine. A 3D analysis of the spine in terms of geometric torsion has revealed three distinct patterns of torsion in major scoliotic curves. Geometric torsion had extreme values at the levels of upper and lower vertebrae and zero or nearly zero values at the levels of the apices. Torsion phenomenon can be unidirectional or bi-directional in both single and double major curves.
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