Brace or plaster cast custom made. a. The patient, in light traction, is positioned with hip and knees lightly bent, in order to obtain the correction of the hyperlordosis. b. Lateral deflection is achieved by applying a plaster strap just beneath the apical vertebra (B). A second strap stabilises the pelvis (A). c. After the plaster cast is complited, the operator appliesa twisting moment. d. The direction of the rotation produced by the couple of forces is opposite to the direction of the vertebral torsion of the scoliotic curve. This allows to obtain transverse sections represented by asymmetrical ellipses.