北京生物醫(yī)學(xué)工程

髖臼橫斷骨折后柱長(zhǎng)/短鋼板內(nèi)固定的有限元建模及分析

FEM Modeling and Analysis of Transverse Fractured Acetabulum with Fixations of Posterior Column Long Plate and Short Plate

作者：吳淑琴潘宏俠裴葆青

單位：中北大學(xué)機(jī)械工程與自動(dòng)化學(xué)院（太原030051）

關(guān)鍵詞：髖臼；橫斷骨折；有限元模型；內(nèi)固定

分類號(hào)：

出版年·卷·期（頁(yè)碼）：2011·30·1（1-4）

摘要：

目的建立有效的髖臼橫斷骨折有限元模型，完成兩種內(nèi)固定方式的比較。方法利用Mimics 10.0中建立髖臼骨骨折的三維模型，在逆向工程Geomagic中進(jìn)行相應(yīng)處理后，在ANSYS Workbench中生成短/長(zhǎng)鋼板固定模型，并進(jìn)行加載分析。結(jié)果相同加載方式下，短鋼板模型的最大位移、模型整體及髖臼窩處的最大應(yīng)力和最大應(yīng)變，均大于長(zhǎng)鋼板模型。另外，短鋼板模型更容易錯(cuò)位失效。結(jié)論本文有限元模型能有效地反映骨盆應(yīng)力分布，分析結(jié)果表明后壁鋼板固定時(shí)，將鋼板長(zhǎng)度延伸至坐骨結(jié)節(jié)處能提供更大的穩(wěn)定性。

Objective To establish a valid finite element model of the transverse fractured acetabulum and finish the analysis of inner fixation ways. Methods The three-dimensional image of the pelvis was reconstructed with the software Mimics 10.0 and was modified with the software Geomagic. Then the 3D model of fractured pelvis was imported into ansys workbench and was established after some operations. After that the integrated 3D finite element models of transverse fractured acetabulums were established, which were fixed with posterior column long and short plates respectively. Finally the vertical load pressure was exerted on the upper terminal plate of the pelvis with some constrainer, and the distribution of stress was analyzed. Results With same loads, the maximum total deformation, von-mises stress and von-mises strain of short plate were bigger than them of long plate. In addition, the model with short plate was easier to lapse. Conclusion It was indicated that the proposed model was stable and valid to contribute the stress of pelvis. For the fixation of transverse fractured acetabulum with a posterior plate, extending the plate to hucklebone tuber was considered more stable.

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