科研之友
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摘要
Objectives: This study focused on L2 pedicle safe range in the axial view. Perforation risk of the L2 pedicle with screw insertion was assessed through digital simulation, generating gradient diagrams for risk zone (RZ), safe zone (SZ), edge key points, and safe range of entry point to help achieve safer screw-setting positions. Methods: 28 healthy L2 vertebral pedicle models were constructed by computed tomography data and Mimics 17.0. After pedicle axis establishment and setting of auxiliary lines, the vertebra were rotated to correct the sagittal and transverse pedicle angle to obtain the axial direction. The gradient diagram for RZ, SZ, edge key points and a safe range of entry point were obtained after compiling all the original axial projections of vertebral pedicle into one image adjusted to match a normalized rectangle. Results: All 28 vertebral pedicles had RZs consisting of 4 parts, with perforation risk of 22.58 +/- 2.84%. Individual risks were 3.06 +/- 0.46%, 6.17 +/- 0.71%, 5.58 +/- 0.58%, and 8.23 +/- 0.95%, respectively, for parts I, II, III, and IV. Average width and height of the pedicle projection were 7.57 mm and 17.65 mm, respectively. Four edge key points, perforation risk, and safe range were analyzed on L2 for a 6.0 mm pedicle screw. Conclusions: The safe range of screw insertion was recommended by a digital simulation. In addition, a screw could generate an optical illusion of precise position on both axial and lateral radiographs with the perforation risk of vertebral pedicle, especially in the part IV.
- 出版日期2018
- 单位同济大学
