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Spinopelvic parameters The spinal parameters were measured as follows. The angle of thoracic kyphosis (TK) was measured from the superior endplate of T1 to the inferior endplate of T12 (F). The angle of lumbar lordosis (LL) was measured from the inferior endplate of T12 to the superior endplate of S1 (G). The horizontal distance between HA and the C7 plumbline (HAC7PL) was also measured (H)
