髋臼横行骨折两种内固定方式的有限元分析

Finite element analysis of two kinds of internal fixation methods for acetabulum transverse fracture

目的比较髋臼横行骨折两种内固定方式的生物力学性能。方法利用有限元分析方法,使用计算机软件建立髋臼骨折模型。模拟常规后路两块钢板及Stoppa入路四方区内侧两块钢板固定方式,比较两种固定方式的生物力学性能。结果两种固定方式中骨折块的总位移非常接近,表明这两种固定方式对这类髋臼骨折总的固定效果基本一致。此外,两种固定方式中骨折块之间的各方向的相对位移及其位移之差非常小,表明两种固定方式在前后、内外及上下方向的固定效果也基本一致。结论两种固定方式生物力学性能没有差别,Stoppa入路四方区内侧两块钢板固定方式可代替常规后路两块钢板进行髋臼横行骨折的固定。

Objective To compare the biomechanical property of two kinds of internal fixation methods for acetabulum transverse fracture. Methods The model of acetabular fractures was established by finite element analysis method and using computer software to simulate the fixed mode of conventional posterior two steel plate and stoppa two steel plate in the inner side of the square area of the road. The biomechanical property of two kinds of internal fixation methods was compared. Results It was very close of the total displacement of fracture between two fixed form, which showed that there was a similar total fixed effect of acetabular fracture between two fixed form. The difference between the displacement of fracture between two fixed form was very small, which showed that there was a similar fixed effect in front and back, internal and external and up and down two fixed form. Conclusion There is no significant difference between the biomechanics of two kinds of internal fixation. The internal fixation with two plates from posterior approach may be substituted by stoppa approach.