此次实验研究的是单个椎体的螺钉拔出力。
This experiment researched the drawn force of the single centrum pedicle screws.
位置不良胸椎椎弓根螺钉拔出力量化研究：究竟损失了多少？
Quantitative analysis of misplaced pedicle screws in the thoracic spine: how much pullout strength is lost?
目的：本研究目的是调查置钉位置不当引起医源性椎弓根壁穿破对胸椎椎弓根螺钉平均拔出力的影响。
Object: The object of this study was to investigate the effects of iatrogenic pedicle perforations from screw misplacement on the mean pullout strength of thoracic pedicle screws.
螺钉的轴向拔出力由螺钉外径决定。
Axial pullout of the screws is determined by the outer diameter of the screw.
螺钉的轴向拔出力由螺钉外径决定。
Axial pullout of the screws is determined by the diameter of the screw.
背景资料概要：当椎弓根螺钉直径增加椎弓根螺钉的拔出力也会增加。
Summary of Background Data. Pullout strength of a pedicle screw increases as the diameter of the screw gets larger.
但应注意咬除皮质的范围不应超过螺钉的直径否则会降低拔出力。
But should notice the influence with pullout testing, the scope of biting away the posterior cortex should not exceed the screw's diameter.
结论：拔出力大小与螺钉固定位置有关。
Conclusions: Extraction force was relevant to screw position.
结果：各组最大螺钉旋入力矩、抗拔出力差异无统计学意义。
Results: There was no significant difference of screw insertion torque and the pull-out strength between each group.
结果：各组最大螺钉旋入力矩、抗拔出力差异无统计学意义。
Results: There was no significant difference of screw insertion torque and the pull-out strength between each group.
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