Fig. 1From: Comparison of CT values in traditional trajectory, traditional cortical bone trajectory, and modified cortical bone trajectoryModel of the L4 vertebra and diagrams illustrating the trajectory from the axial and sagittal views. (A 1–3) TT screws at the L4; (B 1–3) CBT screws at the L4; (C 1–3) MCBT screws at the L4Back to article page