| Objective: To evaluate the biomechanical stability of the cervical spine underwent extensive corpectomy decompression with preserving the posterior wall of the corpectomied vertebral body.Material and Methods: Total 6 fresh adult cervical specimens from C2 to C7 were studied.The strain,migration, twist-intensity, axial-rigidity, twist-rigidity and three-dimentional motion of the C4-6 segment were measured on a Fluid-pressure universal test machine under the condition of normal, anterior titanium mesh cage-graft after C5-subcorpectomy with preserving the posterior wall of the corpectomied vertebral body and after traditional subcorpectomy without preserving the posterior wall.Results: The strain, axial-rigidity, twist-intensity and twist-rigidity under the condition of normal(N bundle), anterior titanium mesh cage-graft after C5-subcorpectomy with preserving the posterior wall of the corpectomied vertebral body(RC bundle) and after traditional subcorpectomy without preserving the posterior wall(C bundle) were respectively 217/170/184(με) ,130.11 /174.80 /134.69(N/mm), 2.54 /2.08 /1.88(N.M), 22.69 /18.96/ 16.35(N.cm/Deg). The migration of N,RC and C bundle during neutrality ,flexion ,extension and left/right bending were respectively 0.90 /0.85 /0.94(mm), 0.58 /0.51 /0.56(mm),0.90 /0.82 /0.88(mm),0.80 /0.64 /0.71(mm).The rangeof motion during flexion/extension,left/right bending and left/right axial rotation of N,RC and C bundle were respectively 5.6 /6.5 /4.5 /9.4 (° ),5.1 /7.0 /4.0 /9.8 (°),5.4 /6.7 /4.1 /10.2 (°). Conclusion: The anterior cervical resconstruction model with titanium mesh cage-graft after C5-subcorpectomy with preserving the posterior wall of the corpectomied vertebral body are more stable than the model with titanium mesh cage-graft after traditional subcorpectomy without preserving the posterior wall according to the strain, axial-rigidity, twist-intensity ,twist-rigidity ,migration and rangeof motion.
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