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Experiment on Fixation Tightening Force of the Second Sacral Outside Pedicle Screw and Sacral Strain Distribution of the Sacrum

ZHANG Yanzhe1,PIAO Chengdong1,Ma Hongshun2(1.The Second Hospital of Jilin University,Changchun 130037,China;2.Engineering Mechanics Department,Nanling Campus,Jilin University,Changchun 130022)  
To study fixation tightening force of sacral II pedicle screw and the strain distribution of sacral,and provide biomechanical parameters for clinical fixation method of sacral II.We got sacrum specimens from fresh corpses of normal people,and fixed in the second sacral pedicle by the method of outside pedicle screw and connected the small sensors to fixation device of pedicle screw to measure the tightening force of pedicle screw.At the same time,the electric strain measurement was done on the strain gauge of different parts which was resistance to static and dynamic strain gauge pre-pasted on the four fixed-site edge of Pedicle and the different parts of sacrum using the resistance strain gauge.As a result,we got the biggest tightening pulling-out force of the pedicle screw and strain value on the left side and right side of the center line strain of the S1 vertebral body,S2 vertebral body and the S3 vertebral body,and we also got strain value on the left side of S1,on the right side of the joint of S1, and the strain value on the sacral connection hole and the middle sacral crest point on the left side of S1、2 and the right side of S1、2.It proves that second sacral pedicle screw procedure in line fits for the biomechanics principles.
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