Fig. 2From: Cervical spine alignment following surgery for adolescent idiopathic scoliosis (AIS): a pre-to-post analysis of 81 patientsLateral radiographs illustrating cervical spine parameters. C2-T1 Ha = C2-T1 Harrison posterior tangent method. PT = pelvic tilt; PI = pelvic incidence; SS = sacral slope; LL = lumbar lordosis; TK = thoracic kyphosis; SVA = sagittal vertical axis; MGS = McGregor slopeBack to article page