本文選題：胸腰椎 + 有限元分析　； 參考：《中國(guó)現(xiàn)代醫(yī)學(xué)雜志》2017年22期

【摘要】：目的利用有限元方法建立椎體前緣不同壓縮狀態(tài)模型,并分析椎體前緣壓縮程度與鄰椎終板應(yīng)力的相關(guān)性。方法基于正常成年人志愿者的胸腰段CT數(shù)據(jù),導(dǎo)入Mimics,經(jīng)圖像分割、修補(bǔ)及三維網(wǎng)格化獲取胸腰椎T11~L13個(gè)節(jié)段數(shù)據(jù),網(wǎng)格賦材質(zhì)屬性后導(dǎo)入ABAQUS軟件,獲取逼真的三維有限元模型。對(duì)模型進(jìn)行生理載荷加載,驗(yàn)證正常模型的有效性。將L1模型底部全自由度固定,在T11模型上方施加前屈、后伸及軸向壓縮載荷,分別將椎體前沿壓縮至90%、80%、70%......10%9個(gè)狀態(tài),提取T11下終板及L1上終板的MISES應(yīng)力,獲得了壓縮狀態(tài)與鄰近終板應(yīng)力關(guān)系曲線。結(jié)果該模型高度逼真,能真實(shí)反映實(shí)際受力狀態(tài);T11椎體下位終板和L1椎體上位終板的應(yīng)力值與T12椎體(研究對(duì)象)前沿的壓縮程度正相關(guān)。結(jié)論應(yīng)力增加可能導(dǎo)致終板骨折可能性增加,進(jìn)而增大相鄰椎體的骨折風(fēng)險(xiǎn),有限元分析結(jié)果能夠?yàn)榕R床實(shí)踐提供依據(jù)。
[Abstract]:Objective to establish different compression state models of the anterior edge of the vertebral body by finite element method and to analyze the correlation between the compression degree of the anterior edge of the vertebral body and the stress of the adjacent vertebral endplate. Methods based on the CT data of thoracic and lumbar segments of normal adult volunteers, the images were segmented, repaired and meshed to obtain the T11~L13 segment data of thoracolumbar vertebrae. ABAQUS software was used to obtain the realistic 3D finite element model. The model was loaded with physiological load to verify the validity of the normal model. The base of L1 model was fixed with full degree of freedom, and the MISES stress of lower end plate and upper end plate of L1 were extracted by applying forward flexion, extension and axial compression load on the top of T11 model, respectively, to compress the front of the vertebral body to 90,8080,70.109 states, and to extract the MISES stress of the lower end plate of T11 and the upper end plate of L1, respectively. The relationship between the compressive state and the stress of the adjacent endplate is obtained. Results the model was highly realistic and could reflect the actual stress state of the lower end plate and the upper end plate of the L1 vertebrae, which was positively correlated with the compression degree of the front edge of the T12 vertebra (object of study). Conclusion the increase of stress may increase the possibility of endplate fracture and then increase the fracture risk of adjacent vertebrae. The results of finite element analysis can provide the basis for clinical practice.
【作者單位】： 南陽理工學(xué)院張仲景國(guó)醫(yī)國(guó)藥學(xué)院;
【基金】：河南省科技攻關(guān)項(xiàng)目(No:142102310107)
【分類號(hào)】：R683

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