with pedicle screws 10 and in one of the embodiments of the present invention the pre contoured spinal rod member 18 are rotated from a first orientation through approximately 90 u00b0 to a second orientation using hex wrenches 50 see frame 3 of fig7 to achieve a substantial correction of the scoliosis in the first two of three axes which will be corrected according to one of the embodiments of the present methodology through use of the present system the next phase after 2 d correction as just described involves applying manipulative forces to pedicle screw clusters in reference to a third axis a u201c roll axis u201d again using aviation terms using pedicle screw clusters derotation tool s 30 see inter alia frame 4 of fig7 after this final correction spinal rod engagement member 20 is tightened to fix pedicle screw 10 and spinal rod 18 in relative position and orientation to secure the corrected spinal column configuration now corrected with reference to all three relevant axes spinal rod engagement member 20 of pedicle screws 10 are tightened using an anti torque feature of wrenches 32 or of their equivalent in an alternative embodiment this feature as is well known in the art allows tightening of nuts and the like without imparting undue torque to the underlying apparatus or structure as shown in fig6 investigative practice of the present method achieves efficacy never before seen in the orthopedic field the u201c before picture u201d is the left hand image of fig6 and the two remaining images are sagittal and dorsal.