Figure 4.
A-C) The cancellous bone biomechanical properties of the C6 vertebra by micro-FEA. (A) The stress distribution image of the C6 vertebral body in the midsagittal plane. The stress distribution transfer into the ventral side of the C6 vertebra from the middle part at 4 weeks after CMS. (B)The stiffness and failure load of the entire C6 vertebra. CMS significantly strengthened the biomechanics in the C6 vertebra at 4 weeks after surgery and showed no difference between the CMS and sham groups at 8 and 12 weeks. (C) The stiffness and failure load of the C6 vertebra in the ventral and dorsal sides. The CMS significantly increased the ventral side of biomechanical behaviours in the C6 vertebra at 4 weeks, while showed no effect on the dorsal side of the C6 vertebra. “*” indicated P < 0.05 compared with the sham group. micro-FEA = micro–finite element analysis; CMS =cervical muscle section.