The use of double derotation maneuver to correct severe scoliosis

Purpose. To study the effectiveness of derotation and correction technique for typical and atypical deformities of the spine involving three arches (Lenke type III-IV) in growing children – an independent double derotation maneuver. Materials and Methods. A technique of derotation and correction proposed for severe combined scoliosis of Lenke type III-IV in growing children. The procedure of instrumentation described, as well as the sequence of mechanical forces to correct differently directed torsion component in one step – an independent double derotation maneuver. The analysis of using the technique in four patients made. Results. The use of the technique allowed performing the deformity correction with 71% improvement of scoliotic component and 51% improvement of apical torsion angle, on the average. Frontal and sagittal balance restored in all the patients. Conclusion. The proposed technique allows not only to correct the spine deformity, but it preserves the distraction potential as the patient grows, and that gives the possibility to use it in actively growing children.