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.
研究目的：确定胸椎侧弯椎弓根有多少松质骨、皮质骨及缺如通道。
OBJECTIVE. : To determine how many thoracic scoliotic pedicles have cancellous versus cortical versus absent channels.
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。
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.
基于这个分类，令人意外的，我们发现当手术时90%胸椎椎弓根是松质骨通道，7%为皮质骨通道，仅有3%缺如通道。
Based on the classification, surprisingly, we found during surgery that 90% of thoracic pedicles had a cancellous channel, whereas 7% had a cortical channel and only 3% had an absent channel.
结论：在骨质疏松患者的骶骨固定中，双皮质骶骨椎弓根钉较单皮质具有更高的锚定强度。
Conclusion:For sacral screw fixation in osteoporotic patient, bicortical pedicle screw has significantly higher fixation strength than unicortical screw.
结论：在骨质疏松患者的骶骨固定中，双皮质骶骨椎弓根钉较单皮质具有更高的锚定强度。
Conclusion:For sacral screw fixation in osteoporotic patient, bicortical pedicle screw has significantly higher fixation strength than unicortical screw.
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