Figure 20
From: A review of the trunk surface metrics used as Scoliosis and other deformities evaluation indices
QSIS indices in the Coronal plane after [55]. a: angle between the vertical and the line T1-S1, b: angle between the vertical and the line T1-natal cleft, c: angle between the horizontal and the PSIS line, d1: horizontal distance of S1 from the vertical, d2: horizontal distance of the natal cleft from the vertical, q1: Max. tilt line. q1 is plotted as tangent to homologous moiré fringes, q2: Pelvic tilt angle. Plotted in a similar to q1 manner, AP-Q: q1 - q2, Area-L or R %: Area percentage of left or right: each lateral back area divided by the total back area as defined from T1 to T12.