密质骨厚度对儿童骨盆碰撞损伤影响分析

Effect of Cortical Thickness on the Impact Injury of Pediatric Pelvis

研究了应用有限元模型预测汽车侧面碰撞中儿童骨盆生物力学响应及损伤评估问题.首先,基于3岁儿童CT数据和有限元方法构建了一个具有真实人体解剖结构的3岁儿童骨盆有限元模型,并重构儿童尸体骨盆侧面碰撞实验,模型仿真结果与尸体实验曲线的趋势相一致,模型仿真结果大部分在尸体实验结果通道内,验证了模型的有效性.然后,应用该模型探讨了密质骨厚度对儿童骨盆损伤生物力学响应的影响.结果表明:儿童骨盆容易发生骨折的位置主要在耻骨支、骶髂关节、髂骨翼;密质骨厚度对儿童骨盆耻骨支的影响最大.该模型也为儿童骨盆碰撞损伤研究提供了有效手段.

In this research,the biomechanical response of children's pelvis during vehicle side impact was investigated and the pelvic injury assessment was predicted using a pediatric finite element(FE)model.Firstly,a FE model of a three-year-old child pelvis with real human anatomical structure was developed based on the CT data of a three-year-old child.The FE model was used for constructing the pediatric cadaver pelvic lateral impact experiments.The simulation results have the same variation trend with those of the cadaver experiments,and the simulation results are mostly located in the cadaver experiments corridor.All these verified the validity of the FE model.Secondly,the effect of different cortical bone thickness on biomechanical responses of children's pelvis was studied using the FE model.The simulation results showed that the fracture was prone to occurring at pelvic locations,such as pubic branch,sacroiliac joint and iliac wing.Also,the thickness of corti-cal bone had the greatest effect on the pelvic pubic ramus in children.The FE model developed in this research provides an effective method for investigating the pelvic impact injury mechanism of children.