跖骨缺损及重建的有限元分析

目的 比较髂骨、肩胛骨、腓骨重建跖骨缺损的力学效果。方法 在足骨骼三维模型上模拟1～3跖骨、4～5跖骨缺损，分别采用髂骨、肩胛骨、腓骨重建。以有限元法计算得到的位移及应力作为评价指标。结果 不同跖骨缺损对残足位移及应力影响不同，1～3跖骨全缺损影响最大。髂骨重建者最大位移和最大应力小于肩胛骨、腓骨重建者。结论 多组跖骨缺损要修复，从力学角度考虑髂骨是首选的供骨。

FEA of the Bone Deficit and Reconstruction in Metatarsuses with Three Kinds of Bones

Objective To compare the mechanical properties of ilium, scapula, and fibula used for reconstruction of metatarsus deficit. Methods Bone defect was simulated at the first to third metatarsus and fourth to fifth metatarsus using a 3-D foot skeletal model. Defects were then reconstructed using ilium, fibula, and scapula, respectively. The displacements and stresses of the reconstructed defects were evaluated using finite element analysis. Results Variations were shown in displacements and stresses among different metatarsus defects, with the largest variation in the deficit of the first to third metatarsus. The use of ilium for metatarsus defect reconstruction revealed the lowest values in the maximum displacement and stress as compared with scapula and fibula. Conclusion Based on mechanical analysis, it was recommended to repair the bony defects involving several metatarsuses and ilium was the most preferred skeleton for reconstruction.