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目的 探讨建立儿童鸡胸的胸廓有限元模型及方法,研究胸壁矫形手术力学机制,为今后胸壁畸形的个性化治疗提供术前解决方案.方法 按照一定入组与排除标准,入选10例鸡胸患儿,分别获得胸部CT扫描原始数据.通过Mimics、ABAQUS等有限元建模与分析软件分别建立鸡胸胸廓有限元模型,并进行力学模拟分析,通过在相同大小力作用下实际与模拟测得的胸骨位移值比较,验证有限元建模方法的有效性.结果 成功建立10例鸡胸胸廓三维有限元模型并分别进行力学模拟分析.发现10例模型在后肋的应力分布范围主要在两侧的1～6肋,多集中在第4～6肋,应力两侧基本对称.统计学分析发现胸廓有限元模型胸骨发生位移值与实际测量比较具有相关性,验证了模型的有效性.结论 Mimics、ABAQUS等有限元建模分析软件可有效建立胸廓三维有限元模型并进行力学分析,可为进一步开展个性化微创胸壁矫形手术奠定基础.

Objective To explore the establishment of 3D thoracic model by finite element methods,and study the mechanical mechanism of minimally invasive surgery for correcting the chest wall deformity,and provide personalized surgery solution in the future.Methods According to admission and exclusion criteria,we selected 10 cases of pectus carinatum that received chest CT scan.The finite element model of pectus carinatum was established and analyzed by Mimics,ABAQUS,etc.The validity of finite element method for chest wall was verified by comparing the sternal displacement between the simulated values and actual values with the same force.Results The 3D finite element model of pectus carinatum was successfully established and analyzed.The stress distribution of the 10 cases in the posterior ribs was mainly in the 1-6 ribs on both sides,mostly concentrated in the 4th to 6th ribs,and the stress was symmetrical on both sides.Statistical analysis showed that the displacement value of the sternum was correlated,and the validity of the model was verified.Conclusion Mimics,ABAQUS and other finite element modeling and analysis software can effectively establish the thoracic 3D finite element model and mechanical analysis,which can help the further development of personalized minimally invasive surgery for correcting chest wall deformities.