| 髋臼记忆内固定系统治疗髋臼横断骨折的三维有限元分析 |
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Received:February 05, 2007
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| 作者 | Author | 单位 | Unit | E-Mail |
| 汪光晔 |
WANG Guang-ye |
第二军医大学长海医院骨科,上海200433 |
Department of Orthopaedics,Changhai Hospital of Second Military Medical University,Shanghai 200433,China |
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| 张春才 |
ZHANG Chun-cai |
第二军医大学长海医院骨科,上海200433 |
Department of Orthopaedics,Changhai Hospital of Second Military Medical University,Shanghai 200433,China |
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| 许硕贵 |
XU Shuo-gui |
第二军医大学长海医院骨科,上海200433 |
Department of Orthopaedics,Changhai Hospital of Second Military Medical University,Shanghai 200433,China |
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| 期刊信息：《中国骨伤》2007年20卷，第12期，第830-832页 |
| DOI：doi:10.3969/j.issn.1003-0034.yyyy.nn.zzz |
| 基金项目:上海科学技术委员会科研计划项目(编号:03JC14008) |
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目的:研究髋臼三维记忆内固定系统(ATMFS)治疗髋臼横形骨折及其产生的动态记忆应力促进骨愈合的生物力学基础。
方法:利用计算机仿真三维有限元技术,对以记忆合金ATMFS固定髋臼横断骨折的生物力学行为进行模拟,BaⅡ型三维有限元模型共划分2520个结点,7946个单元;CⅢ型三维有限元结构共划分1667个结点,6 332个单元,单元采用TET 4单元;髋臼有限元模型共划分113028个单元,结点数为19348。
结果:①BaⅡ型和CⅢ型接骨器固定髋骨后,变形最大的加压部第1结构主应力BaⅡ型最大值分别为224.5 MPa和-34 MPa,其维持纵向的动态记忆持骨力196 N;CⅢ型最大值分别为224.5 MPa和-34 MPa,其维持轴向的动态记忆加压力为125.05 N,二者皆远小于其屈服强度。②被固定髋骨应力分布均匀,各结点所受应力主要为正应力;髋臼底主要为压应力,近髋臼边缘处及髋臼前角部分为张应力。③骨折断面以压应力为主,最大压力峰值5.93 MPa,最大张力0.164 MPa,压应力主要通过皮质骨传递(约1.46 MPa),约为松质骨断面应力(约0.242 MPa)的7倍。
结论:ATMFS有良好的耐疲劳与重复使用性,其固定后产生的动态记忆加压应力场,有利于固定髋臼横断骨折的稳定。 |
| [关键词]:髋骨折 髋臼 骨折固定术,内 生物力学 有限元分析 |
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| Three dimensional finite element analysis for fixation of transverse acetabular fractures with Acetabular Tri-dimensional Memory-alloy-Fixation System |
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Abstract:
Objective:To study the biomechanical basis of Acetabular Tri-dimensional Memory-alloy-Fixation System(ATMFS) for treating transverse acetabular fractures,and the effects of dynamic memorial stress of ATMFS facilitating bone-healing.
Methods:By computer emulation and three dimensional(3D) finite element analyses,the biomechanical behavior of ATMFS was emulated and analyzed.The finite element BaⅡ model of ATMFS was divided into 7 946 units.The number of nodes was 2 520.The finite element CⅢ model was divided into 1 667 nodes.The number of units was 6 332.The elements were TET 4 elements.The finite element model of acetabulum was divided into 113 028 units,the number of nodes was 19 348.
Results: When the connector fixated acetabulum,the maximum first structural major stress of metamorphosed compressive part was 224.5 MPa and-34 MPa in BaⅡ model;the maximum first structural major stress of metamorphosed compressive part was 224.5 MPa and-34 MPa in CⅢ model,both far less than its utmost stress and fatigue limit.The longitudinal initiative memorial bone holding force in BaⅡ model for maintaining axial stability was 196 N,and the longitudinal initiative memorial compression force in CⅢ model was 125.05 N.The stress distribution in fixed acetabulum and the medial surface of fracture was even,the stress in most nodes was positive stress.
Conclusion:The ATMFS has good anti-fatigue and reuse characters.The dynamic memorial compressive stress field is good for the fixation of transverse acetabular fractures and enhancement of bone healing. |
| KEYWORDS:Hip fractures Acetabulum Fracture fixation,internal Biomechanics Finite element analysis |
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| 引用本文，请按以下格式著录参考文献： |
| 中文格式: | 汪光晔,张春才,许硕贵.髋臼记忆内固定系统治疗髋臼横断骨折的三维有限元分析[J].中国骨伤,2007,20(12):830~832 |
| 英文格式: | WANG Guang-ye,ZHANG Chun-cai,XU Shuo-gui.Three dimensional finite element analysis for fixation of transverse acetabular fractures with Acetabular Tri-dimensional Memory-alloy-Fixation System[J].zhongguo gu shang / China J Orthop Trauma ,2007,20(12):830~832 |
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