改良记忆合金环抱器治疗髋关节置换术后股骨假体周围骨折的生物力学研究  

Biomechanical study of improved memory alloy embracing fixators in treatment of periprosthetic femoral fracture due to hip arthroplasty

作　　者：孙强[1] 鲁尧[1] 王洪勋[1] 向帅[1] 

机构地区：[1]大连大学附属中山医院骨科,116001

出　　处：《中华创伤杂志》2015年第7期637-640,共4页Chinese Journal of Trauma

基　　金：大连市医学院科学研究计划资助项目[大卫科发（2014）142号]

摘　　要：目的 对改良记忆合金环抱器治疗老年性髋关节置换术后股骨假体周围骨折（PFF）进行生物力学研究,分析改良记忆合金环抱器与普通记忆合金环抱器在生物力学方面的差异.方法 30根国人新鲜全长股骨纳入实验,所选择的标本证实无病理缺陷、骨折、畸形或肿瘤,按随机数字表法分为实验组（15根）和对照组（15根）,依据Vancouver分型中B1型髋关节置换术后假体周围骨折建模.实验组采用改良记忆合金环抱器进行固定,对照组采用普通记忆合金环抱器进行固定.将股骨标本固定在生物力学试验机上进行力学对比测试.结果 当施加相同的载荷时,实验组和对照组的应变值最大可相差30％,两者的位移值最大可相差48％.实验组和对照组三点弯曲试验差异无统计学意义（P＞0.05）,轴向压缩及扭转试验差异有统计学意义（P＜0.05或0.01）.结论 改良记忆合金环抱器在抗压缩、抗扭转方面明显优于普通记忆合金环抱器.Objective To study the mechanics of improved memory alloy fixators for salvage of periprosthetic femoral fracture （PFF） after hip arthroplasty in the elderly.Methods Thirty countrymen fresh cadaveric femurs with no pathological defect,fracture,deformity or tumor were randomly divided into experimental group and control group with 15 femurs in each according to the random number table.A model of Vancouver type B1 periprosthetic femoral fracture following hip arthroplasty was induced.The fracture was treated with modified memory alloy embracing fixators in experimental group;instead general memory alloy embracing fixators in control group.All specimens were tested biomechanically.Results Under the same mechanical loading,the two groups showed respective 30% and 48% maximum differences in stress value and displacement.Results in three-point bending test did not differ significantly between the two groups （P 〉 0.05）,but there were significant differences in axial compression and torsion test （P 〈 0.05 or 0.01）.Conclusion The improved memory alloy embracing fixators present better resistance to compression and torsion compared to the general fixators.

关 键 词：内固定器 关节成形术 置换 髋 假体周围骨折 合金 记忆 

分 类 号：R687.3[医药卫生—骨科学]