角棒与圆棒在椎弓根螺钉固定系统中抗旋转能力的生物力学比较  

Biomechanical evaluation of rotation torque with polygonal and round rod on pedicle screw fixations

作　　者：黄紫房[1] 杨军林[1] 朱青安[2] 邹学农[1] 苏培强[1] 谢超凡[1] 林翔[1] 赵卫东[3] 

机构地区：[1]中山大学附属第一医院脊柱外科,广州市510080 [2]南方医科大学南方医院脊柱骨病外科,广州市510515 [3]南方医科大学基础医学院生物力学重点实验室,广州市510630

出　　处：《中国脊柱脊髓杂志》2011年第4期325-328,共4页Chinese Journal of Spine and Spinal Cord

基　　金：广东省科技计划基金资助项目(编号:2008B030301114)

摘　　要：目的:比较角棒与圆棒在Legacy、USSⅡ、RF单轴向椎弓根螺钉固定系统中的抗旋转性能。方法:将Legacy、USSⅡ、RF单轴向椎弓根螺钉分别与原装圆棒或自行设计的角棒组合,分为6个实验组:(1)Legacy螺钉和Legacy圆棒组(A组);(2)Legacy螺钉和角棒组(B组);(3)USSⅡ螺钉和USSⅡ圆棒组(C组);(4)USSⅡ螺钉和角棒组(D组);(5)RF螺钉与RF圆棒组(E组);(6)RF螺钉和角棒组(F组)。每组7套,其中1套行预试验。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,在MTS 858试验机上测量旋转滑动扭矩。结果:A、B组的旋转滑动扭矩分别为12.3±1.9Nm和16.9±2.1Nm;C、D组的旋转滑动扭矩分别为3.9±0.8Nm和4.6±0.7Nm;F、F组的旋转滑动扭矩分别为6.7±0.4Nm和17.6±0.7Nm。Legacy螺钉与RF螺钉配角棒组的旋转滑动扭矩高于配圆棒组(P<0.05),USSⅡ螺钉配两种棒的旋转滑动力矩无显著性差异(P>0.05)。结论:角棒能显著提高Legacy和RF椎弓根螺固定系统的抗旋转能力。Objective：To compare rotation torque between round rod and polygonal rod on Legacy,USSⅡ and RF pedicle screw instrument.Method：Six test groups were designed as follows：（1）Legacy screw plus Legacy round rod（group A）;（2）Legacy screw plus polygonal rod（group B）;（3）USSⅡ screw plus USSⅡ round rod（group C）;（4）USSⅡ screw plus polygonal rod（group D）;（5）RF screw plus RF round rod（group E）;（6）RF screw plus polygonal rod（group F）.Each group had 7 monoaxial pedicle screws and one round or polygonal rod,each time one screw was tightened on rod with constant torque.MTS 858 testing system was used to record the rotation torque,MNOVA was used for analysis.Result：The average of rotational torque of group A and B was 12.3±1.9Nm and 16.9±2.1Nm respectively,3.9±0.8Nm and 4.6±0.7Nm respectively for group C and D,6.7±0.4Nm and 17.6±0.7Nm for group E and F respectively.The rotational torque of polygonal rod plus Legacy screw and RF screw were significantly higher than round rod（P0.05）.The rotational torque between polygonal and round rod plus USSⅡ screw showed no significant difference（P0.05）.Conclusion：Polygonal rod can significantly increase the rotation torque of Legacy and RF pedicle screw system.

关 键 词：椎弓根螺钉 角棒 去旋转 扭矩 

分 类 号：R318.01[医药卫生—生物医学工程] R687.3[医药卫生—基础医学]