6岁儿童股骨有限元模型的建立及股骨颈损伤的仿真分析

基于6岁儿童解剖学结构,对其下肢的CT扫描数据进行三维几何重构,并利用有限元的建模技术建立6岁儿童股骨的三维有限元模型.通过加载弯矩的仿真实验,模拟交通事故中儿童跌倒状态下的股骨受力情况以及所引起的股骨颈骨折.研究结果表明:6岁儿童在交通事故中跌倒瞬时产生较大的股骨与地面接触力,股骨颈外侧应力最大,易出现骨折现象.仿真结果与以往实验结论相符合并与医学结论吻合,从而验证了模型有效.建立的6岁儿童股骨三维有限元模型可以为跌倒所引起的股骨颈骨折损伤生物力学响应提供理论依据.

Establishment of 6-Year-Old Children Femoral Finite Element Model and Simulation Analysis of Femoral Neck Injury

A 6-year-old children’s femur finite element model was developed based on the CT image data and children anatomical features.The three dimentional geometric model was reconstructed based on the CT scanning data first,and then a finite element mesh was developed.The finite element model was used to simulate the falling of a child during an accident.Analysis of the results of the simulated experiment showed that the instantaneous large contact force between the femoral neck and ground occurred during the falling after the child was hit in a car accident.The peak stress was found on the ectocondyle of femoral neck which could lead to a fracture.The reseach results agreeded with the past experiments and could provide some insights into 6-year-old children’s femoral injury biomechanics.