A finite element modeling of posterior atlantoaxial fixation and biomechanical analysis of C2 intralaminar screw fixation  

作　　者：Ma Xuexiao Peng Xianbo Xiang Hongfei Zhang Yan Zhang Guoqing Chen Bohua 

机构地区：[1]Department of Orthopaedic Surgery, the Affiliated Hospital of Qingdao University, Qingdao, Shandong 266003, China

出　　处：《Chinese Medical Journal》2014年第7期1266-1271,共6页中华医学杂志（英文版）

摘　　要：Background The objective of this study was to use three-dimensional finite element （FE） models to analyze the stability and the biomechanics of two upper cervical fixation methods：the C2 intralaminar screw method and the C2 pedicle screw method.Methods From computed tomography images,a nonlinear three-dimensional FE model from C0 （occiput） to C3 was developed with anatomic detail.The C2 intralaminar screw and the C2 pedicle screw systems were added to the model,in parallel to establish the interlaminar model and the pedicle model.The two models were operated with all possible states of motion and physiological loads to simulate normal movement.Results Both the C2 intralaminar screw method and the C2 pedicle screw method significantly reduced motion compared with the intact model.There were no statistically significant differences between the two methods.The Von Mises stresses of the internal and external laminar walls were similar between the two methods.Stability was also similar.Conclusions The C2 intralaminar screw method can complement but cannot completely replace the C2 pedicle screw method.Clinicians would need to assess and decide which approach to adopt for the best therapeutic effect.Background The objective of this study was to use three-dimensional finite element （FE） models to analyze the stability and the biomechanics of two upper cervical fixation methods：the C2 intralaminar screw method and the C2 pedicle screw method.Methods From computed tomography images,a nonlinear three-dimensional FE model from C0 （occiput） to C3 was developed with anatomic detail.The C2 intralaminar screw and the C2 pedicle screw systems were added to the model,in parallel to establish the interlaminar model and the pedicle model.The two models were operated with all possible states of motion and physiological loads to simulate normal movement.Results Both the C2 intralaminar screw method and the C2 pedicle screw method significantly reduced motion compared with the intact model.There were no statistically significant differences between the two methods.The Von Mises stresses of the internal and external laminar walls were similar between the two methods.Stability was also similar.Conclusions The C2 intralaminar screw method can complement but cannot completely replace the C2 pedicle screw method.Clinicians would need to assess and decide which approach to adopt for the best therapeutic effect.

关 键 词：finite elements upper cervical spine intralaminar screw pedicle screw BIOMECHANICS 

分 类 号：TP391.72[自动化与计算机技术—计算机应用技术] TH781[自动化与计算机技术—计算机科学与技术]