本文選題：腰5椎體指數(shù) + 有限元模型��； 參考：《南華大學(xué)》2015年碩士論文

【摘要】：目的:通過建立2個無腰椎疾患的成人腰5椎體三維有限元模型,并對2個有限元模型進行有效性驗證,探討腰5椎體指數(shù)的減小,與其峽部的應(yīng)力關(guān)系。方法:采集2個無腰椎疾患的成人腰5椎體,其指數(shù)分別為70、90的CT數(shù)據(jù)。通過mimics10.0軟件分離重建單個腰5椎體幾何模型,將重建的模型導(dǎo)入geomagic11.0使粗糙的幾何模型進行光滑等優(yōu)化處理并生成曲面模型,再將曲面模型導(dǎo)入UGS NX6.0軟件進行縫合處理,生成實體模型。將實體模型導(dǎo)入ansys14.0有限元軟件,通過布爾運算將模型劃分為皮質(zhì)骨與松質(zhì)骨,再將腰5椎體的皮質(zhì)骨與松質(zhì)骨進行粘合,并對模型賦予單元類型及材料屬性,再將實體模型進行有限元網(wǎng)格劃分,對網(wǎng)格劃分成功的腰5椎體有限元模型的下表面及下關(guān)節(jié)突的所有節(jié)點,在各個方向的自由度施加約束,以及對腰5椎體上表面和上關(guān)節(jié)突的所有節(jié)點逐步遞增施加軸向載荷,通過有限元軟件的后處理功能對腰5椎體峽部進行應(yīng)力分析并計算有限元模型的位移。用Spss19.0軟件統(tǒng)計兩個模型雙側(cè)峽部的應(yīng)力值,比較其差異性。結(jié)果:1.腰5椎體指數(shù)為70的有限元模型單元數(shù)47147個,節(jié)點數(shù)71601個,腰5椎體指數(shù)為90的有限元模型單元數(shù)37895個,節(jié)點數(shù)57646個。通過對模型逐步遞增施加載荷,其壓縮-位移數(shù)據(jù)在國外文獻報道的體外實驗數(shù)據(jù)的范圍之間。2.在500N的作用力下,對照組峽部應(yīng)力值1.04±0.12,參照組峽部應(yīng)力值2.03±0.10,兩組對比(P0.05)。在1000N的作用力下,對照組峽部應(yīng)力值2.30±0.22,參照組峽部應(yīng)力值3.29±0.34,兩組對比(P0.05)。在1500N的作用力下,對照組峽部應(yīng)力值4.05±0.28,參照組峽部應(yīng)力值4.81±0.55,兩組對比(P0.05)。在2000N的作用力下,對照組峽部應(yīng)力值6.85±0.52,參照組峽部應(yīng)力值9.07±0.54,兩組對比(P0.05)。對照組及觀察組的峽部應(yīng)力值分別在500N、1000N、1500N、2000N之間比較有差異(P0.05)。結(jié)論:1.成功建立了2個腰5椎體指數(shù)分別為70、90的有限元模型,并驗證了兩個椎體指數(shù)分別為70、90的有限元模型的有效性。2.椎體指數(shù)小的腰5峽部所承受的應(yīng)力要大于椎體指數(shù)大的腰5峽部所承受的應(yīng)力。并且隨著載荷的增大,雙側(cè)峽部的應(yīng)力也隨之增大。若腰5椎體指數(shù)較小的峽部長期處于高負荷狀態(tài)下,其腰5峽部可能更容易出現(xiàn)崩裂。
[Abstract]:Objective: to establish two three dimensional finite element models of lumbar 5 vertebrae in adults without lumbar disease, and to verify the validity of the two finite element models, and to explore the relationship between the decrease of lumbar 5 vertebral body index and the stress in the isthmus. Methods: the CT data of lumbar 5 vertebrae of 2 adults without lumbar disease were 70 ~ 90 respectively. A single lumbar 5 vertebrae geometry model was reconstructed by mimics10.0 software. The reconstructed model was imported into geomagic11.0 to make rough geometry model smooth and optimized, and the surface model was generated. The surface model was imported into UGS NX6.0 software for suture. Generate entity model. The solid model was imported into ansys14.0 finite element software. The model was divided into cortical bone and cancellous bone by Boolean operation. The cortical bone and cancellous bone of lumbar 5 vertebrae were bonded to each other, and the unit type and material attribute were assigned to the model. Then the solid model is meshed by finite element method, and all the nodes of the lower surface and the lower articular process of the lumbar 5 vertebrae finite element model, which are successfully meshed, are constrained by the degrees of freedom in all directions. The axial load on the upper surface of the lumbar 5 vertebra and all the nodes of the upper articular process is gradually applied. The stress of the isthmus of the lumbar 5 vertebrae is analyzed and the displacement of the finite element model is calculated by the post processing function of the finite element software. The stress values of bilateral isthmus of the two models were calculated by Spss19.0 software and the differences were compared. The result is 1: 1. The finite element number of lumbar 5 vertebral body index is 70, the number of finite element model is 47147, the number of nodes is 71601, the finite element number of lumbar 5 vertebral body index is 90 and the number of finite element model is 37895 and the number of nodes is 57646. By gradually increasing the load on the model, the compression-displacement data between the range of in vitro experimental data reported in foreign literature. The stress of isthmus in the control group was 1.04 鹵0.12, and that in the control group was 2.03 鹵0.10 under the action force of 500N. The isthmus stress of the control group was 2.30 鹵0.22, and that of the control group was 3.29 鹵0.34. The stress of isthmus in the control group was 4.05 鹵0.28, that in the control group was 4.81 鹵0.55, and that in the control group was 4.81 鹵0.55. The stress of isthmus in the control group was 6.85 鹵0.52, and that in the control group was 9.07 鹵0.54, which was compared with that in the control group (P 0.05). The stress values of isthmus in the control group and the observation group were significantly different from those in the control group and the observation group respectively between 500 Nu 1000N and 1500 Nu 2000N (P 0.05). Conclusion 1. Two finite element models with L5 vertebral body index of 70 ~ 90 were successfully established, and the validity of two finite element models with L5 vertebral body index of 70 ~ 90 was verified. The stress of the lumbar 5 isthmus with small vertebral body index is greater than that of the lumbar 5 isthmus with large vertebral body index. And with the increase of load, the stress of bilateral isthmus also increases. If the isthmus with low lumbar 5 body mass index is in high load for a long time, the lumbar 5 isthmus may be more prone to collapse.
【學(xué)位授予單位】：南華大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：R687.3

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