Objective To measure and compare the biomechanical properties of two different types of sacral screw fixation either through the superior endplate or anterior cortex.
目的测试骶骨螺钉经上终板固定技术的生物力学性能，并与经前皮质固定技术比较。
ABSTRACT: Objective To compare the biomechanical characteristics by designing newly manufactured cortex self tapping interlocking screw matched with interlocking nail.
目的设计与新型髓内钉相配套的双皮质自攻螺纹交锁螺钉，并对其生物力学性能进行对比研究。
Objective: Cortex thicknesses of subaxial cervical pedicle entrys circumferential structures were measured on planar ct images to provide quantitative data for cervical pedicle screw insertion.
目的：对下颈椎椎弓根四壁及入口毗邻结构的皮质厚度行影像学测量，为临床椎弓根钉植入提供参考。
Conclusion: The thinnest lateral cortex is one cause of pedicle screw penetration.
结论：椎弓根外侧骨皮质最薄，可能是导致椎弓根皮质破裂的原因。
Conclusion: The thinnest lateral cortex is one cause of pedicle screw penetration.
结论：椎弓根外侧骨皮质最薄，可能是导致椎弓根皮质破裂的原因。
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