Biomechanical changes of atlantoaxial pedicle screw rod fixation: a finite element analysis
BACKGROUND: Atlantoaxial pedicle screw rod fixation has been extensively applied in clinic, especially for upper cervical lesions with osteoporosis. But there are few biomechanical studies. OBJECTIVE: To investigate the biomechanical features of atlantoaxial pedicle screw rod fixation by three dimensional finite element analysis. METHODS: CT data of occipital bone and atlantoaxial vertebrae were obtained from a healthy adult volunteer, and the three dimensional finite element analysis model of atlantoaxial pedicle screw rod fixation was Huan Shu Zhui Zhui Gong Gen Luo Ding Nei Gu Ding De San Wei You Xian Yuan Fen Xi You Xian Yuan Mo Xing Jian Li Tong Guo CT Sao Miao Huo Qu Yi Jian Kang Cheng Nian Ren Zhen Gu Huan Shu Zhui Tu Xiang Xin Xi ,Gou Jian Huan Shu Zhui Zhui Gong Gen Luo Ding Ding Bang Nei Gu Ding San Wei You Xian Yuan Fen Xi Mo Xing Guan Cha Zhi Biao Li Yong Abaqus Jia Zai Qian Qu Hou Shen Zuo You Ce Wan Zuo You Xuan Zhuan Deng 6 Chong Zai He ,Fen Xi Bu Tong Yun Dong Zhuang Tai Xia Nei Gu Ding Xi Tong De Ying Li Bian Hua Jie Lun Huan Shu Zhui Zhui Gong Gen Luo Ding Ding Bang Nei Gu Ding An Quan Ke Kao ,Luo Ding Jin Ding Dian Gen Bu Zhou Wei Yi Chu Xian Ying Li Ji Zhong ,Xuan Zhuan Zhuang Tai Xia ,Luo Ding Suo Shou De Ying Li Ming Xian Zeng Jia Chen SJ, Ma XY, Yang JC, Yin QS, Yang M, Zou XB. Biomechanical changes of atlantoaxial pedicle screw rod fixation: a finite element analysis. Zhongguo Zuzhi Gongcheng Yanjiu. 2018;22(31):4970 4974. DOI:10.3969/j.issn.2095 4344.0362 P.O. Box 10002, Shenyang 110180 www.CRTER.org 4971 established. The changes of von Mises Stress of the internal fixation system under different loads (flexion, extension, left and right lateral bending, as well as left and right axial rotation by Abaqus) were analyzed. RESULTS AND CONCLUSION: (1) Atlantoaxial pedicle screw rod fixation significantly reduced the motion range of upper cervical vertebra. (2) The stress concentrated on the bone screw interface and screw rod interface under different postures. The maximum stress located at the root of axoid pedicle screws under flexion, left and right lateral bending, as well as left and right axial rotation. (3) The maximum stress located at the root of atlas pedicle screws under extension. (4) Mises stress was obviously increased under rotation. (5) Atlantoaxial pedicle screw rod fixation is safe and reliable. Stress concentration always appears at the root of screw and the Mises stress is increased obviously under rotation. Subject headings: Axis; Finite Element Analysis; Biomechanics; Tissue Engineering Funding: the National Natural Science Foundation of China, No. 81672232; the Science and Technology Program of Guangdong Province, No. 2015B020233013 0 Yin Yan Introduction Zhui Gong Gen Luo Ding Kang Ba Chu Li Jiao Ce Kuai Luo Ding Ji Zhui Ban Luo Ding Jun Qiang Qi Sheng Wu Li Xue Xing Neng Xiang Dui Geng Jia ,Dan Qi Xiang Guan Sheng Wu Li Xue Yan Jiu Xian Jian Yin Dong Deng Ceng Jian Li Liao Huan Shu Zhui Zhui Gong Gen Luo Ding Ding Ban Xi Tong ,Bing Dui Qi Jin Xing You Xian Yuan Sheng Wu Li Xue Yan Jiu ,Dan Qi Suo Cai Yong De Ding Ban Xi Tong Lin Chuang Ying Yong Jiao Shao Wen Zhang Cai Yong You Xian Yuan Fen Xi Fang Fa Jian Li Huan Shu Zhui Zhui Gong Gen Luo Ding Ding Bang Nei Gu Ding Xi Tong De Mo Xing ,Dui Qi Sheng Wu Li Xue Te Xing Jin Xing Fen Xi He Tan Tao 1 Dui Xiang He Fang Fa Subjects and methods 1.1 She Ji San Wei You Xian Yuan Zao Mo Fen Xi 1.2 Dui Xiang Xuan Ze 1Li Jian Kang Cheng Ren Zhi Yuan Zhe ,Shen Gao 170 cm,Ti Zhi Liang 60 kg. Zhi Yuan Zhe Dui Shi Yan Fang An Zhi Qing Tong Yi Xian Pai She Jing Zhui Zheng Ce Wei Ji Huan Shu Zhui Kai Kou Wei ,Pai Chu Huan Shu Zhui Ji Xing Chuang Shang Zhong Liu Gan Ran Deng Qing Kuang 1.3 Fang Fa 1.3.1 You Xian Yuan Mo Xing Jian Li Cai Yong 64Pai Xi Men Zi Luo Xuan CTSao Miao Shang Jing Zhui ,Sao Miao Fan Wei Wei Lu Di Zhi C3,Ceng Hou 1.0 mm,Huo De Ti Ceng 136 Fu Gu Chuang Er Wei Duan Ceng Tu Xiang ,Zhong Jian Guan Zhuang Wei Ji Shi Zhuang Wei ,Yi DicomGe Shi Wen Jian Shu Chu Bing Bao Cun Jiang Qi Dao Ru San Wei Chu Li Ruan Jian Mimics 10.0Zhong Jin Xing Chu Li ,Gen Ju CTZhi Shi Xian Tu Xiang De Yu Zhi Hua Fen Chi ,Fen Bie Ti Qu Zhen Gu Huan Shu Zhui ,Bing Dui Suo Ti Qu Tu Xiang Jin Xing Bi Yao De Xiu Bu ,Yi STLGe Shi Bao Cun Bing Dao Ru Ni Xiang Ruan Jian Geomagic Studio 2013Jin Xing Tu Xiang You Hua Chu Li ,Huo De Guang Hua Ju You Xiang Xi Jie Pou Jie Gou De Zhen Gu Huan Shu Zhui San Wei Shi Ti Mo Xing ,Yi STPGe Shi Bao Cun Bing Dao Ru San Wei She Ji Ruan Jian SoliworksZhong ,Zhong Jian Ruan Gu Ren Dai Zu Zhi (Qian Zong Ren Dai Qian Fu Mo Hou Fu Mo Fu Mo Chi Zhuang Tu Ren Dai Yi Zhuang Ren Dai Xiang Ren Dai Ji Jian Ren Dai Guan Jie Nang ,Wei Liao Jiao Wei Bi Zhen Zhong Xian Huan Shu Zhui Tuo Wei Mo Xing ,Wei Zhong Jian Huan Zhui Heng Ren Dai Ji Shi Zi Ren Dai ,Jin Er Jian Li Huan Shu Zhui Zhui Gong Gen Luo Ding Ding Bang Nei Gu Ding Xi Tong CADMo Xing Jiang Zhen Gu Huan Shu Zhui Ji Guan Jie Ruan Gu Ding Bang Xi Tong Bao Cun Wei STEPGe Shi ,Ren Dai Ling Bao Cun Wei IGSGe Shi ,Fen Bie Dao Ru Tong Yong Da Xing Fei Xian Xing You Xian Yuan Fen Xi Ruan Jian Abaqus6.14 1Zhong ,Gou Jian Huan Shu Zhui Zhui Gong Gen Luo Ding Ding Bang Nei Gu Ding San Wei You Xian Yuan Fen Xi Mo Xing Mo Xing Zhong Suo She Ji De Suo You Sheng Wu Li Xue Cai Liao De Cai Liao Li Xue Te Zheng Jun Jia Ding Wei Fei Jun Zhi Lian Xu He Ge Xiang Tong Xing Mo Xing Dan Xing Mo Liang (Youngs Modulus) Bo Song Bi (Poisson's Ratio)Ji Dan Yuan Hua Fen Can Kao Wen Xian Zi Liao ,Jie Guo Jian Biao 1. Huan Zhui Jin Zhen Dian Wei Yu Jing Shu Zhui Xia Guan Jie Tu Zhong Dian De Zong Chui Xian Yu Chui Xian Jing Guo Chu De Huan Zhui Hou Gong Shang Yuan Xia 3.0 mmDe Shui Ping Xian Jiao Dian ,Luo Ding Jin Zhen Jiao Du Wei Nei Qing 10deg,Shang Qing 5deg;Shu Zhui Zhui Gong Gen Luo Ding De Jin Zhen Dian Wei Yu Shu Zhui Xia Guan Jie Tu De Nei Shang Xiang Xian ,Zai Qi Zhong Xin Dian Nei Shang Ge 2 mmChu ,Luo Ding Jin Ding Jiao Du Wei Nei Qing 30deg,Shang Qing 30deg. 1.3.2 You Xian Yuan Mo Xing Bian Jie Yue Shu Qu Yu Zai He Jia Zai Ji You Xiao Xing Yan Zheng Mo Xing Zhong Gu Ge Ding Bang Nei Gu Ding Wei Liang Du Li Jie Gou Ti ,Cai Yong Bang Ding Yue Shu Tiao Jian ,Huan Zhen Guan Jie Huan Shu Guan Jie Ding Yi Wei Hua Dong Jie Hong Guan Xi ,Mo Ca Xi Shu She Zhi Wei 0.1,Zhen Shi Fan Ying Ding Gu Guan Jie Mian Jie Hong Zhuang Tai Bian Jie Yue Shu Qu Yu Wei Shu Zhui Zhui Ti Xia Yuan ,Ji Shu Zhui Zhui Ti Xia Yuan Suo You Jie Dian Zai X, Y, ZZhou Shang De Wei Yi Jun Wei 0. Zai Zhen Gu Shang Bu Shi Jia 42 NDe Ya Li Mo Ni Tou Lu Zhong Li (An Ti Zhi Liang De 7%Ji Suan ,Tong Shi Shi Jia 1.5 N*mDe Chun Li Ju ,Mo Ni Sheng Li Zhuang Tai Xia Shang Jing Zhui De San Wei Yun Dong Zhuang Kuang ,Chan Sheng Qian Qu Hou Shen Zuo You Ce Wan Zuo You Xuan Zhuan 6Chong Yun Dong Bing Ce Liang ,Suo De Jie Guo Yu LapsiwalaDeng De Ti Wai Sheng Wu Li Xue Shi Yan Jie Guo Xiang Dui Bi ,Yan Zheng Suo Jian You Xian Yuan Mo Xing De You Xiao Xing ,Guan Cha Bu Tong Zhuang Tai Xia Luo Ding Gu Jie Mian Luo Ding Bang Jie Mian De Ying Li Fen Bu Bian Hua Zhuang Tai Shou Li Shi Ge Dan Yuan You Zu Gou Wen Ding Xing ,Bu Ji Cai Liao Shou Li Bian Xing 1.4 Zhu Yao Guan Cha Zhi Biao Li Yong AbaqusJia Zai Qian Qu Hou Shen Zuo You Ce Wan Zuo You Xuan Zhuan Deng 6Chong Zai He ,Fen Xi Bu Tong Yun Dong Zhuang Tai Xia Nei Gu Ding Xi Tong De Ying Li Bian Hua 2 Jie Guo Results Suo Jian Li De Shang Jing Zhui You Xian Yuan Fen Xi Mo Xing Zhong ,Gong Bao Han 191 840 Ge Jie Dian ,776 904Ge Dan Yuan ,Qi Zhong Zhui Gu 140 777Ge Jie Dian 703 470Ge Dan Yuan ;Ding Bang Nei Gu Ding 28 715Ge Jie Dian ,12 130Ge Dan Yuan ;Ruan Gu 22 272Ge Jie Dian ,61 266Ge Dan Yuan ;Ren Dai 76Ge Jie Dian 38Ge Dan Yuan Suo Jian Mo Xing Bi Zhen Di Miao Hui Liao Huan Shu Zhui Zhui Gong Gen Luo Ding Ding Bang Nei Gu Ding Xi Tong De Jie Gou Te Dian ,Qi Ying Li Fen Bu Jian Tu 1,2Ji Biao 2. Zai 6Chong Bu Tong De Yun Dong Zhuang Tai Xia ,Luo Ding Suo Shou Ying Li Yu Huan Shu Ding Dao Suo Shou Ying Li Xiang Dui Ying ,Zhu Yao Ji Zhong Zai Luo Ding De Ding Gu Jiao Jie Chu Ji Yu Ding Bang Lian Jie Chu ,Zui Da De Ying Li Jun Chan Sheng Zai Luo Ding Zhi Ru Gu Zhi Bu Fen De Gen Bu Zhou Wei Qian Qu Zhuang Tai Xia ,Shu Zhui Zhui Gong Gen Luo Ding Bi Huan Zhui Zhui Gong Gen Luo Ding Cheng Shou Geng Da De Ying Li ,Lian Jie Bang Yu Yu Shu Zhui Zhui Gong Gen Luo Ding Lian Jie Chu Suo Cheng Shou De Ying Li Zui Da Hou Shen Zhuang Tai Xia ,Huan Zhui Zhui Gong Gen Luo Ding Bi Shu Zhui Zhui Gong Gen Luo Ding Cheng Shou Geng Da De Ying Li ,Lian Jie Bang Yu Yu Huan Zhui Zhui Gong Gen Luo Ding Lian Jie Chu Suo Cheng Shou De Ying Li Zui Da Chen Shu Jin ,Ma Xiang Yang ,Yang Jin Cheng ,Yin Qing Shui ,Yang Min ,Zou Xiao Bao You Xian Yuan Fa Fen Xi Huan Shu Zhui Zhui Gong Gen Luo Ding Nei Gu Ding De Sheng Wu Li Xue Bian Hua [J] Zhong Guo Zu Zhi Gong Cheng Yan Jiu ,2018,22(31):4970 4974. DOI:10.3969/j.issn.2095 4344.0362 ISSN 2095 4344 CN 21 1581/R CODEN: ZLKHAH 4972 Zuo You Ce Wan Zhuang Tai Xia ,Shu Zhui Zhui Gong Gen Luo Ding Bi Huan Zhui Zhui Gong Gen Luo Ding Cheng Shou Geng Da De Ying Li ,Yu Shu Zhui Zhui Gong Gen Luo Ding Yu Lian Jie Bang Lian Jie Chu Suo Cheng Shou Ying Li Zui Da ,Lian Jie Bang Yu Yu Ce Wan Fang Xiang Yi Ce Shu Zhui Zhui Gong Gen Luo Ding Lian Jie Chu Suo Cheng Shou De Ya Li Zui Da Xuan Zhuan Zhuang Tai Xia ,Shu Zhui Zhui Gong Gen Luo Ding Bi Huan Zhui Zhui Gong Gen Luo Ding Cheng Shou Geng Da De Ying Li ,Yu Xuan Zhuan Fang Xiang Xiang Fan Yi Ce De Shu Zhui Zhui Gong Gen Luo Ding Yu Lian Jie Bang Lian Jie Chu Suo Cheng Shou Ying Li Zui Da ,Lian Jie Bang Yu Yu Xuan Zhuan Fang Xiang Xiang Fan Yi Ce De Shu Zhui Zhui Gong Gen Luo Ding Lian Jie Chu Suo Cheng Shou De Ya Li Zui Da Qian Qu Zai He Xia ,Luo Ding Ji Lian Jie Bang Suo Cheng Shou Ying Li Xiang Dui Jiao Xiao Xuan Zhuan Zai He Xia ,Luo Ding Ji Lian Jie Bang Cun Zai Ming Xian Gao Ying Li Qu Biao 1 San Wei Mo Xing Ge Chong You Xian Yuan Cai Liao Can Shu Table 1 Material properties used for various components in three dimensional models Biao Zhu :C3D4 Wei Si Mian Ti Dan Yuan Ke ;C3D8 Wei Ba Mian Ti Dan Yuan Ke ;T3D2Wei Liang Jie Dian Hang Jia Cai Liao Dan Yuan Hua Fen Yang Shi Dan Xing Mo Liang (MPa) Bo Song Bi Pi Zhi Gu C3D4 12 000 0.29