【作者】 许硕贵； 张春才； 苏佳灿； 曾伟明； 顾绍德； 方如华； 张林春；

【Author】 (XU Shui-Gui, ZHANG Chun-Cai, SU Jia-Can, ZENG Wei-Ming, GU Shao-De, FANG Ru-Hua, ZHANG Lin-Chun. ( Department of Orthopaedic Surgery, Changhai Hospital, Second Military Medical University, Shanghai 200433, China; Photomechanics Laboratory of Tongji University.)

【机构】 第二军医大学长海医院骨科； 同济大学光测力学研究室；

【摘要】 目的:研究天鹅记忆接骨器(SMC)治疗骨折骨不连的生物力学基础。方法:利用电测、二维(2D)、三维(3D)光弹性技术。电测通过贴片、标定,得到SMC的载荷-应变曲线,并通过固定新鲜人体肱骨,计算SMC的动态记忆持骨力值;通过2D光弹性技术计算SMC鹅颈加压部动态记忆加压力值;用精密浇铸法得到肱骨环氧树脂3D光弹性模型,模仿临床使用,得到SMC 固定下的肱骨模型3D应力场分布,同时利用Leize偏光显微镜结合三维光弹法,计算肱骨模型考察点3D应力场中的6个应力分量。结果:电测SMC动态记忆持骨的生物学力值为110．35N;2D 光弹测得纵向动态记忆加压力为163．88N;3D光弹测得SMC的鹅颈加压部、鹅体接骨板部、鹅翼持骨部三部相互协调,记忆持骨,形成动态3D立体固定,产生全场应力分布,3D应力分离表明 SMC固定后骨折端的应力基本为正应力。结论:SMC空间立体记忆固定的应力场,有利于骨折、骨不连的治疗,允许早期功能锻炼并促进骨愈合。更多还原

【Abstract】 Objective: To study the biomechanical basis of SMC for treating fracture and nonunion. Methods: The study was performed by electrometric method, two and three dimensional (3D) photoelasticity techniques. Electrometric method: by pasting gauge, multiple times standardization, load-strain curve was got, then the dynamic memorably holding force of SMC for fixating tubular bone was calculated. Photoelasticity techniques: calculated the dynamically compressive force of swan neck compressive part by 2D photoelasticity. By precision moulding, the epoxy resin 3D photoelasticity humeral model was established. Then it was fixated by SMC, meanwhile an epoxy resin cirque was used to share the continuously memorial compress to guarantee the success of the experiment. The 3D stress distribution of humeral model was got, and 6 space component stress of the inspected node was divided by Leize polarizing microscope. Results: The continuously memorably holding force of SMC determined by electrometric method was 110.35 N. The longitudinal dynamically compressive memorial force was 163.88 N determined by 2D method. 3D photoelasticity method showed that the swan neck compressive part of SMC, swan body connecting part of SMC and swan wing holding part of SMC harmonized with each other, memorably holding bone, longitudinal compression, 3D fixation style was formed, and overall stress distribution was produced. The division of three-dimensional stress indicated that the stress at the fracture site was positive stress in chief. Conclusion: The stress field produced by 3D memorial fixation of SMC is good for the treatment of fractures and nonunion, early function exercises is allowed, and the fracture healing is prompted.更多还原