Quantitative analysis of misplaced pedicle screws in the thoracic spine: how much pullout strength is lost?
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？
Objective: To compare the initial stability and pullout strength of threaded and non threaded cervical interbody fusion devices on human specimens by biomechanical method.
目的：用生物力学的方法比较螺旋式与环式椎体融合器的初始稳定性和拔出力量。
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.
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。
Pullout strength and biomechanical stability differences were compared statistically.
拔出强度及生物力学稳定性进行统计学分析。
Summary of Background Data. Pullout strength of a pedicle screw increases as the diameter of the screw gets larger.
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.
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。
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