三种椎弓根螺钉系统采用角棒与圆棒的抗去旋转能力的生物力学比较研究

来源 :2010广东省医学会骨科年会暨岭南骨科学术大会 | 被引量 : 0次 | 上传用户:castchen
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  目的 测量比较角棒与目前国内常用的Legacy、USSⅡ、RF圆棒的旋转滑动扭矩,评估角棒抗去旋转滑动方面的性能。方法 将Legacy、USSⅡ、RF椎弓根螺钉分别与圆棒或角棒组合,分为六个实验组:(1) Legacy螺钉和Legacy圆棒;(2)Legacy螺钉和角棒;(3) USSⅡ螺钉和USSⅡ圆棒;(4)、USSⅡ螺钉和角棒;(5)RF螺钉与康辉圆棒;(6)RF螺钉和角棒。每组7例,分别以固定的扭矩标准锁紧单枚椎弓根螺钉与圆棒或角棒,然后将钉棒固定于材料试验机上,施加旋转扭矩直至钉与棒间产生滑动。测量旋转过程中的最大扭矩。采用2×3多因素方差分析不同棒与钉对去旋转扭矩的影响。
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