Figure 21From: A review of the trunk surface metrics used as Scoliosis and other deformities evaluation indices POsterior Trunk Symmetry Index (POTSI) after [56, 61]. The POsterior Trunk Symmetry Index (POTSI) is computed as a sum of the 6 indices: POTSI = (FAI-C7 + FAI-A + FAI-T) + (HDI-S + HDI-A + HDI-T).Back to article page