CAJ | 학술논문

背景:肱骨骨折治疗中经常遇到的主要问题在于应力加载的方向与应力加载的力值.目的:探讨三维建模及有限元分析肱骨骨折治疗中轴向加载的力学理论依据.设计:构建肱骨骨折的三维有限元模型,进行不同方位的加载.单位:一所军医大学附属医院骨科和一所大学生命科学与生物工程学院.材料:实验于2002-04/2004-04在上海长海医院和上海同济大学生命科学实验室完成,选择肱骨标本行CT成像.方法:以肱骨横截面CT图像为基础,建立肱骨模型,利用ANSYS5.6软件进行计算,选取三维十结点四面体单元,共划分2 729个结点、49 041个单元,分析骨折断面与轴线成30.,45.,90.及X,Y,Z三方向固定时肱骨轴向受压的应力分布及大小.主要观察指标:对比不同方向肱骨骨折加载后的数值,寻求临床治疗的参考.结果:肱骨断面与非断面处应力差异较大,断面处应力较集中,且以断面为中心呈非严格对称分布,应力较大区域分布在距骨折部位10 mm左右,是其他应力区的两三倍.结论:肱骨骨折治疗中应视不同情况估算所需载荷大小,选择合适内固定植入物以适应其功能活动的应力要求.
배경:굉골골절치료중경상우도적주요문제재우응력가재적방향여응력가재적력치.목적:탐토삼유건모급유한원분석굉골골절치료중축향가재적역학이론의거.설계:구건굉골골절적삼유유한원모형,진행불동방위적가재.단위:일소군의대학부속의원골과화일소대학생명과학여생물공정학원.재료:실험우2002-04/2004-04재상해장해의원화상해동제대학생명과학실험실완성,선택굉골표본행CT성상.방법:이굉골횡절면CT도상위기출,건립굉골모형,이용ANSYS5.6연건진행계산,선취삼유십결점사면체단원,공화분2 729개결점、49 041개단원,분석골절단면여축선성30.,45.,90.급X,Y,Z삼방향고정시굉골축향수압적응력분포급대소.주요관찰지표:대비불동방향굉골골절가재후적수치,심구림상치료적삼고.결과:굉골단면여비단면처응력차이교대,단면처응력교집중,차이단면위중심정비엄격대칭분포,응력교대구역분포재거골절부위10 mm좌우,시기타응력구적량삼배.결론:굉골골절치료중응시불동정황고산소수재하대소,선택합괄내고정식입물이괄응기공능활동적응력요구.
BACKGROUND: The most frequently encountered problem that an orthopedic doctor encounters in treating humerus fracture is how to choose the exact direction and amount of load applied on humerus.OBJECTIVE: To explore the clinical significance of establishing a three-dimensional model and finite element analysis in treating humerus fracture and to provide theoretical basis for applying appropriate axial stress.DESIGN: The three dimensional model of humerus was reconstructed, on which compression from different directions was applied.SETTING: Orthopedic department of an affiliated hospital and life science laboratory of a university.MATERIALS: A humerus specimen received CT scanning and the trial was conducted in Shanghai Changhai Hospital and Life Science Laboratory of Tongji University from April 2002 to April 2004.METHODS: The three dimensional model of humerus was established and relevant calculation was completed with ANSYS 5.6 software. The humerus model was divided into 2 729 nodes and 49 041 units based on a three-dimensional ten-node tetrahedron as one unit. The distribution and intensity of axial compression on the fracture gap section were calculated and analyzed in the following conditions, i. e. when the humerus was fixed in X, Y and Z directions and the fracture gap section was 30°, 45°, 90° to Z axis.MAIN OUTCOME MEASURES: The axial pressure on the fracture gap section in different conditions to provide evidence for clinical treatment.RESULTS: The stress applied on the fracture gap was relatively concentrated and was 2 -3 times stronger than that in other areas, and it was generally symmetrically distributed within 10 mm around the fracture gap.CONCLUSION: The required load on humerus fracture should be calculated before a suitable implant is applied to accommodate the movement of humerus without compromising healing of the fracture.