Figure 15

Action of the derotation pushes at thoracic and lumbar levels. At the lumbar level, the push on the hump helps to reconstruct lordosis, and as a consequence it is directly on the transverse apophysis, potentially also adding a frontal plane corrective action (A). At the thoracic level, on the contrary, the push can damage the sagittal plane, and must not reach the transverse processes, so to allow a possible leverage by the rib that could even result in a kyphotisating action (B).