新型双向锁定骨外固定器的生物力学评价  

Biomechanical evaluation of a new type of the bidirectional latch external fixation device

作　　者：郑伟[1] 赵卫东[1] 李绍刚[2] 陈春[1] 卢巍[1] 黄文华[1] 

机构地区：[1]南方医科大学解剖学教研室广东省医学生物力学重点实验室,广州510515 [2]武汉钢铁集团公司武钢总医院骨科,武汉430080

出　　处：《中国临床解剖学杂志》2011年第2期225-228,共4页Chinese Journal of Clinical Anatomy

摘　　要：目的对新设计的新型双向锁定骨外固定器进行生物力学评价。方法取7具成人尸体正常胫骨标本(对照组),制作中段骨折模型,根据骨断端间距(g=0、10 mm)、骨-外固定器杆间距(b-r=10、25、40和55 mm)的不同组合分成8个试验组(A～H组),使用新型双向锁定骨外固定器固定。应用BOSE机进行轴向压缩、扭转、前/后和内/外侧弯曲的力学测试,分别计算刚度值。并进行统计学分析。结果对照组的轴向压缩、前/后、内/外侧弯曲和扭转4种刚度与试验组比较均有显著性差异(P<0.05)。骨断端间距的差异对压缩、前/后弯曲、内/外侧弯曲3种刚度均有显著性意义(P<0.00);骨与连接杆间距的差异对上述3种刚度也均有显著性意义(P<0.05);但两者对扭转刚度均无显著性意义(P>0.05);两处理因素间均无交互效应(P值分别为0.054、0.527、0.819、0.065)。结论该新型双向锁定骨外固定器具有良好的稳定性。Objective To evaluate the biomechanical properties of a new type of the bidirectional latch external fixation device.Methods Seven intact human tibial specimens（control group）were used to make midpiece fracture models,each of which was tested in 8 groups（test group） on the basis of different bone gaps（0,10 mm） and the bone-rod gaps（10,25,40 and 55mm）.During the experiment,axial compression,torsion,anterior-posterior bending and medial-lateral bending were performed with BOSE.The rigidity of each bone-fixation combination was calculated and statisticly analyzed.Results The rigidity of control group in axial compression,AP bending,ML bending and torsion were significant with regard to 4 kinds of rigidity of test group.The differences of the bone gap（0mm,10mm） induced a significant change in the rigidity of axial compression,torsion,AP bending and ML bending（P0.00）,but not in the rigidity of torsion（P0.05）.There was no interaction between 2 factors with regard to 4 kinds of rigidity（P values are 0.054,0.527,0.819,0.065 respectively）.Conclusions The stability of the new type of the bidirectional latch external fixation device is favor to meet the special biomechanical needs.

关 键 词：外固定器 生物力学 刚度 

分 类 号：R318.01[医药卫生—生物医学工程]