| Background: The pedicle screw technique is used by orthopaedic surgeon now. There are many styles of the pedicle screw systems to choice for the orthopaedic surgeon. Because there is much potential trauma to spinal cord, nerve or blood vessel during operation. FDA of America authorized this technique as one of standard methods until 1999. The clinical anatomy and techniques were studied during 1990s,Many experts studied the morphologic characters and the relations between the inserting screw point and the surrounding organs or tissues ,which were the theoretic foundation as our study .Moran used the saw dissect the pedicle and obtained the parameters about the pedicle ,which was the method ' s foundation as our study. We investigated many up-to-the-minute literatures ,The studies about the pedicle screw wall was rare by Computed Radiography(CR) Spiral CT(SCT) and true vertebrae .Moreover the comparing studies was much rare by different inserting screw methods .We tried to do study at our department.Objectives : To quantify the pedicle screw path wall for clinical surgeon on T 11-L2 with the" Magerl "technique and the "A" shape crest technique ; To evaluate clinical significance of Computed Radiography (CR) Spiral CT(SCT) and true vertebrae about pedicle screw's safety ; To look for a objective foundation to determine about pedicle screw's safety of thoracolumbar segment.Material and Methods: In this study, the data were presented that provide the surgeon with information about the sereve wall ,which were especially useful for pedicle screw fixation. By the different inserting screw methods ,We divided the specimens astwo longitudinal groups :thc " Magcrl " technique group and the "A" shape crest technique group ; By the different managing methods , We divided the specimens as three transverse groups :CR group > SCT group and true vertebrae specimen group .We used the" Magcrl" technique and the" A "shape crest technique to insert the pedicle screws with the truely clinical screw in every pedicle of T11 -L2 of twenties adult vertebras. (2) We drew off the screw from the pedicle ,thcn got the image by CR and Spiral-CT. finally ,wc dissected the pedicle at the narrowwest position , measured the superior, inferior, medial and lateral wall and observed the penetration about the pedicle .(3) The data were analyzed by software SPSS10.0, t-test,F-test LSD t-test and X2 -test were used to compare difference between groups ,A difference was considerred significant if the p value was below 0.05.Results: (1) There were significant differences (p <0.01) about the medial and lateral wall among CR group, S-CT group and true pedicle group ,So the inferior and superior wall were . (2) There was significant differcnccs( p <0.001)about the medial walls between CR group and S-CT group ,between the CR group and the true vertebrae group.So the lateral walls were. (3) There was no significant difference about the medial wall between SCT group and truly vertebrae group ,Neither the lateral wall was (p >0.05). (4) As far as it was the violation ratio about the CR group ,S-CT group and true pedicle wall group , the penetration's ratio of the CR group was compared with the ratio of SCT group and the truly vertebrae group .there were significant difference .(p <0.01). At L1 -L2 ,the violation ratio of CR group between the "A" shape crest technique and The "Magerl" technique has not difference ,p =0.173. the violation of superior and inferior didn't happen. (5) At T11-12 ,Thc medial wall of "Mageral" technique was thicker than its of the " A " shape crest technique , The lateral wall of "Magerl" technique was thinner than its of the "A" shape crest technique ;Al L1-2.Thc medial wall of "Magcrl" technique was thinner than its of the " A "shape crest technique , The lateral wall of "Magerl" technique was thicker than its of the " A " shapecrest.Conclusions :(1) The medial and lateral wall have the important significance for the pedicle' ssafely;(2) S-CT is more reliable than Computed Radiography about evaluating th...
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