锁定加压接骨板固定股骨骨干骨折生物力学特征的三维有限元分析  

Investigation on Biomechanics Behavior Using Three-dimensional Finite Element Analysis for Femur Shaft Fracture Treated with Locking Compression Plate

作　　者：何勤理 姜薇[1] 罗教明[1] 

机构地区：[1]四川大学生物材料工程研究中心,成都610065

出　　处：《生物医学工程学杂志》2014年第4期777-781,792,共6页Journal of Biomedical Engineering

基　　金：国家自然科学基金资助项目(30471758)

摘　　要：基于人体股骨CT数据,结合股骨骨折不同阶段的结构特征,建立了锁定加压接骨板(LCP)固定股骨中部骨折的医学装配模型,运用三维有限元分析(3D-FEA)方法,选择一倍体重(70kg)生理载荷和约束条件,计算分析锁定加压接骨板固定股骨骨折在不同愈合阶段时股骨及LCP中的应力分布。结果表明,在骨折部位未发生愈合阶段与软组织形成阶段,股骨及LCP中应力分布相近,股骨内最大应力值(371.23、272.76MPa)远高于自然股骨,且应力主要分布于骨折处以上部位股骨;在骨痂形成阶段,部分股骨内应力向下转移,最大应力值(68.17MPa)较前两阶段明显降低且低于正常骨的极限强度,安排适当的康复训练有利于新骨生长和患者康复。Based on the CT data and the structure characteristics of the femoral fractures during different healing stages, medical FE models of fractured femur treated with locking compression plate （LCP）were built. Under the physiological load of a standard body weight （70 kg） and the constraint condition, the stress distributions of LCP and fractured femur during healing were calculated by means of three-dimensional finite element analysis （3D-FEA）. The results showed that the stress distribution in the LCP and the fractured femur was similar, during the initial stage which there was no newly formed bone or soft tissue in fracture site. The maximum yon Mises stress （371.23,272.76 MPa） in the fractured femur was much higher than that in natural femur,and the intensive stress was concentrated mainly in the proximal area of the fractured femur. With the growth of bony callus bone in fracture site, the intensity of stress in proximal femur decreased. Contrasted to the two cases mentioned above,the value of the maximum von Mises stress （68.17 MPa） in bony callus bone stage decreased significantly,and was lower than the safe strength of natural bone. Therefore,appropriate training which is benefitial for the growth to new bone could be arranged for the better rehabilitation.

关 键 词：锁定加压接骨板 三维有限元分析 生物力学 骨折治疗模型 

分 类 号：R687.3[医药卫生—骨科学]