transpedicular
1.Transpedicular AF fixation in treatment of thoracolumbar fracture and dislocation
2.Clinical study of influence of bone mineral density on effectiven ess of transpedicular screw system
3.The Treatment of Thoracolumbar vertebra Fracture with Transpedicular Bone Graft and GSS—Ⅱ pedicle screw internal fixation
4.Objective To analyze the cause of malposition of transpedicular screw internal fixation in thoracolumbar spine and perforation of bone.
5.Methods Eighteen cases of malposition of transpedicular screw internal fixation in thoracolumbar spine were detected by X-ray and the causes were analyzed according to the location of perforation.
6.The authors report the surgical result for the fracture of thoracolumbar spine treated with four types of short segmental transpedicular fixation There were Roy-Camille technique 90 cases,Dick technique 30 cases,R-F technique 56 cases and Margerl technique 37 cases in 213 cases.
7.Results The results of the test showed that ZH transpedicular internal fixator was much better than the other two oneswith: load-responsive change was much less than that of Dick screw and Steffee plate by 7.2% and 14% at Point A andby 17% and 28% at Point B;
8.From March 1987 to February 1993,A total of 52 cases had undergone the transpedicular internal fixation for the fracture of thoracolumbar spine, which consisted of 32 cases of Roy - Camille plate, 12 cases of Dick techniques,6 cases of Steffee fixator and 2 cases of R-F instrumentation.
9.Conclusion The major cause of malposition of transpedicular screw internal fixation were mutation of and ambiguity of opography induced by spinal congenital malformation, cataplasia, fracture, lumbar olisthe or lateral curvature; neglect of individuality and poor accuracy in implanting pedicle screw and inadequate understanding of biomechanics of spine about paracentesis.
