Fig. 17

This figure shows the clinical picture and the modified Schroth’s schema of blocks for the functional three-curve pattern (3C). This functional pattern is called in Rigo classification A type. From observation of the clinical picture, the trunk can be here divided into three blocks or regions, with the main thoracic region affected by the main structural thoracic curve and the lower and upper trunk affected by both upper and lower compensations. The three consequent blocks are translated and rotated one against the other, collapsed on the concavities and expanded on the convexities. The main thoracic and proximal thoracic blocks are imbalanced to the right side according to the lower lumbo-pelvic block (including this last the central sacral line). The lumbo-pelvic block is translated to the left according to the polygon of sustentation, with the left hip joint in a relative adduction in comparison with the right hip joint. In case there is a lumbar structural curve, this is still coupled to the pelvis. The schema of blocks offers to the clinicians, physiotherapists, and orthotists a clear composition of the scoliotic phenomenon in 3D and can be taken as a guide for the 3D correction. When the main thoracic curve is convex to the right, the used term is “right 3D or right A type.” The mirror case exists and it is called “left 3C or A type”