抗拔出力和骨折块间加压力评价拉力螺钉拧紧程度的实验研究  

The biomechanical study to evaluate tightening condition for AO lag screw depending on pull-out strength and interfragmentary compressive force

作　　者：孙培栋 焦培峰 毕振宇 欧阳钧 

机构地区：[1]南方医科大学基础医学院人体解剖学教研室广东省医学生物力学重点实验室,广州510515

出　　处：《生物医学工程学杂志》2017年第6期863-868,共6页Journal of Biomedical Engineering

基　　金：国家自然科学基金青年项目(81702160);南方医科大学青年科技人员培育项目(B1012010)

摘　　要：本实验研究对骨科拉力螺钉在紧固阶段的抗拔出力和骨折块间加压力的关系进行探讨。利用6.5 mm松质骨拉力螺钉和标准人工骨进行测试。实验包含旋转置入测试和随后的螺钉拔出测试两部分,分别记录不同紧固角度下螺钉的骨折块间加压力和抗拔出力。结果发现拉力螺钉产生的骨折块间加压力和抗拔出力随紧固角度呈现特定的变化规律且不同时到达峰值。本实验揭示了拉力螺钉紧固阶段的力学环境变化,并发现了确定其最佳置钉终止时机的有效方法。The aim of this experimental study focused on the relationship between pull-out strength （POS） and interfragmentary compressive force （IFCF） of AO cancellous lag screw during tightening procedure. The 6.5 mm AO cancellous lag screw and synthetic cancellous bone were used for this research. The test contains rotation tests and the subsequent pull-out tests, to record the IFCF and POS under different tightening angle groups. The results of this study demonstrated the specific relationship between IFCF and POS and showed that they didn＇t reach the peak at the very same time. This study revealed the change of mechanical environment surrounding AO lag screw during tightening procedure and found the effective method to determine the optimum terminating time of AO lag screw inserting.

关 键 词：抗拔出力 骨折块间加压力 松质骨拉力螺钉 拧紧程度 人工松质骨 

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