Biomechanical Computational Study of Pedicle Screw Position and Density in AIS Instrumentation.

Screw density had no significant effect on 3D correction through the primary segmental translation maneuver. Transverse plane correction through subsequent apical vertebral derotation was positively correlated with screw density at the apical levels (r=0.825, P<0.05). Bone-screw forces were negatively correlated with overall screw density (P<0.05).