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Raster stereographic analysis of spinal alignment. (A) Trunk imbalance, which was calculated by vertebra prominent (VP), dimple midpoint (DM), dimple left (DL), and dimple right (DR). (B) Trunk inclination. (C) Pelvic tilt and torsion (error of axis), which could calculate the surface rotation and lateral deviation. (D) Kyphotic angle between VP and the inflectional point (ITL) and the lordotic angle between ITL and DM.
