Fig. 9

Comparison of the maximum equivalent stress on the left and right sides of the L4 and L5 posterior bone based on the sagittal plane during five spinal behaviors, along with the distribution of equivalent stress in the L4 and L5 posterior bone. Extension. left axial rotation (A), right axial rotation (B), generated using ANSYS Workbench 2023 R2 (https://www.ansys.com/products/ansys-workbench).