| Cervical spondylopathy is usually caused by degenerative pathological changes of the cervical spondylosis.It is mainly due to long-term strain on cervical spine,hyperosteogeny,or intervertebral disc herniation,ligament enlargement and hypertrophy,which makes cervical spinal cord,nerve root or vertebral artery compressed,and appears a series of functional disorders with clinical syndrome.Objective : To compare the biomechanical effects of Zero-P anterior cervical intervertebral fusion system & Prevail fusion system and Cage-Plate cage system on adjacent segments,so as to provide references for the long-term clinical efficacy of single segment cervical spondylosis.Methods:To establish the finite element model of cervical spine C1-C7 with the CT scan data of normal people.After validating the validity of the model,two finite element models implanted with Zero-P fusion system & Prevail fusion system and Cage-Plate fusion system between cervical C5/C6 were built.The physiological torque 1.5Nm was loaded respectively to simulate cervical flexion,extension,lateral bending and rotation.Compare the scope of activities and the changes of nucleus pulposus of intervertebral disc,endplate and annulus,the joint stress of the three models.Results : A finite element model of the cervical vertebra,C5/C6 single segment implanted with Zero-P fusion device & Prevail fusion system and Cage-Plate fusion device was successfully established.The biomechanical data of the adjacent tissues under the different working conditions of the same moment were obtained.Conclusions:Cage-Plate fixed cage and Zero-P & Prevail fusion system will increase the range of adjacent segments,and the stress on adjacent discs,annulus and small joints will increase,which may cause adjacent segment lesions in the long run.However,there is no essential difference in the biomechanical effects of the Cage-Plate and Zero-P & Prevail fusion system fuses on the adjacent segments. |
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