前踝撞擊征發(fā)生機(jī)制的生物力學(xué)有限元分析
發(fā)布時(shí)間：2019-01-08 13:07
【摘要】：目的構(gòu)建符合足踝特點(diǎn)的全足三維有限元模型,并進(jìn)行應(yīng)力分析,模擬全足在步態(tài)過程中后足踩地過程,以此探究前踝多發(fā)撞擊的生物力學(xué)機(jī)制。方法1、對(duì)1名男性志愿者(年齡26歲,身高170cm,體重60kg)采用64排CT掃描儀(西門子公司)進(jìn)行右踝關(guān)節(jié)掃描,通過詢問志愿者以往的病史并對(duì)其進(jìn)行相關(guān)檢查,排除志愿者存在踝關(guān)節(jié)損傷、腫瘤、畸形等病史。在中立位無(wú)負(fù)重狀態(tài)下,基于踝關(guān)節(jié)解剖結(jié)構(gòu),利用三維處理軟件Mimics,Hypermesh,Abaqus等構(gòu)建包括骨與足周圍軟組織及關(guān)節(jié)韌帶的全足三維有限元模型。2、構(gòu)建中立位全足三維模型,依據(jù)Gefen.A的足踝步態(tài)分析方法結(jié)果,在坐標(biāo)系中先將整個(gè)模型在失狀位上逆時(shí)針旋轉(zhuǎn)30o,再構(gòu)建出地面,整個(gè)全足模型即與地面形成30o,形成前足著地,后足抬起30o的狀態(tài),然后在脛腓骨截面上施加重力(方向垂直地面,大小為600N),模擬后足踩地的動(dòng)態(tài)過程,研究前踝在后足踩落地過程中的應(yīng)力分布及位移情況,探討落地相中多發(fā)前踝撞擊的發(fā)生機(jī)制。對(duì)所構(gòu)建出的全足三維有限元模型,通過與既往國(guó)外有限元全足模型結(jié)果數(shù)據(jù)相對(duì)比,驗(yàn)證本實(shí)驗(yàn)中有限元模型的準(zhǔn)確有效性。結(jié)果1、全足數(shù)字化三維有限元模型的建立;本研究基于一名男性志愿者足踝CT圖像數(shù)據(jù),建立了包含28塊骨性結(jié)構(gòu)、56條韌帶及足周圍軟組織的全足有限元模型,共219599個(gè)節(jié)點(diǎn),938845個(gè)單元。2、從有限元模型分析結(jié)果可知:在后足踩地的過程中,踝關(guān)節(jié)的應(yīng)力值和位移量不斷增大,當(dāng)模型與地面為30o時(shí),踝關(guān)節(jié)應(yīng)力峰值為0.058MPa,位移峰值為0.5633mm;當(dāng)模型與地面為25o時(shí),踝關(guān)節(jié)應(yīng)力峰值為0.085MPa,位移峰值為0.7359mm;當(dāng)模型與地面為20o時(shí),踝關(guān)節(jié)應(yīng)力峰值為0.116MPa,位移峰值為0.9486mm;當(dāng)模型與地面為15o時(shí),踝關(guān)節(jié)應(yīng)力峰值為0.152MPa,位移峰值為1.1703mm;當(dāng)模型與地面為10o時(shí),踝關(guān)節(jié)應(yīng)力峰值為0.188MPa,位移峰值為1.3981mm;當(dāng)模型與地面為0o時(shí),踝關(guān)節(jié)應(yīng)力峰值為0.225MPa,位移峰值為1.6255mm。踝關(guān)節(jié)的應(yīng)力峰值始終位于前踝外側(cè),并且不斷增加,從0.085MPa增加到0.225MPa,前踝位移量也在不斷地增加,從0.563mm增加到1.6255mm。結(jié)論1、本研究所構(gòu)建的全足三維有限元模型準(zhǔn)確、完整,模型的仿真性好,能夠較完整的體現(xiàn)足踝部復(fù)雜的三維信息。2、在正常的落地過程中,踝關(guān)節(jié)的前側(cè)始終有最大的應(yīng)力和位移量,因此最容易發(fā)生撞擊。
[Abstract]:Objective to study the biomechanical mechanism of multiple impact of anterior malleolus by constructing a three-dimensional finite element model of full foot in accordance with the characteristics of foot and ankle and making stress analysis to simulate the process of foot stepping on the ground during gait. Methods 1. A male volunteer (26 years old, 170 cm tall, weight 60kg) was scanned by 64 row CT scanner (Siemens). A history of ankle injuries, tumors, deformities was excluded. Under the condition of neutral position without load, based on the anatomical structure of ankle joint, the three-dimensional finite element model of the whole foot including bone and soft tissue around foot and articular ligament was constructed by using three-dimensional processing software Mimics,Hypermesh,Abaqus etc. According to the results of Gefen.A 's ankle gait analysis method, the whole model is rotated counterclockwise in the coordinate system for 30o. then the ground is constructed. The whole foot model forms 30os with the ground, forming the state of forefoot landing and hind foot lifting 30o. Then apply gravity to the section of the tibia and fibula (vertical direction, 600N), simulate the dynamic process of the hind foot, and study the stress distribution and displacement of the anterior malleolus during the landing of the hind foot. To investigate the mechanism of multiple anterior malleolus impact in landing phase. By comparing the results of the three dimensional finite element model with that of the foreign finite element model, the accuracy and validity of the finite element model in this experiment are verified. Results 1. The establishment of full foot digital 3D finite element model; Based on the CT image data of ankle and foot of a male volunteer, a finite element model of the whole foot with 28 bone structures, 56 ligaments and soft tissue around the foot was established, with 219599 nodes and 938845 units. The results of finite element model analysis show that the stress and displacement of the ankle joint increase continuously during the process of stepping on the ground. When the model and the ground are 30 o, the stress peak value of the ankle joint is 0.058 MPA and the displacement peak value is 0.5633 mm; When the model and ground are 25 o, the peak stress of ankle joint is 0.085 MPA, the peak value of displacement is 0.7359mm, when the model and ground is 20o, the peak value of stress and displacement of ankle joint is 0.116MPa and 0.9486mm, respectively. When the model and ground are 15 o, the peak stress of ankle joint is 0.152 MPA, the peak value of displacement is 1.1703 mm, when the model and ground is 10 o, the peak value of stress and displacement of ankle joint is 0.188 MPA and 1.3981 mm, respectively. When the model and ground are 0 o, the peak stress of ankle joint is 0.225 MPA and the peak value of displacement is 1.6255 mm. The stress peak of the ankle was always located at the lateral side of the anterior malleolus and increased continuously, from 0.085MPa to 0.225 MPA, and the anterior malleolus displacement increased from 0.563mm to 1.6255 mm. Conclusion 1, the 3D finite element model constructed in this study is accurate, complete, and the simulation of the model is good, and it can reflect the complex 3D information of ankle and foot completely. 2, in the normal landing process, The front of the ankle always has maximum stress and displacement, so it is most likely to impact.
【學(xué)位授予單位】：安徽醫(yī)科大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：R684
本文編號(hào)：2404639
[Abstract]:Objective to study the biomechanical mechanism of multiple impact of anterior malleolus by constructing a three-dimensional finite element model of full foot in accordance with the characteristics of foot and ankle and making stress analysis to simulate the process of foot stepping on the ground during gait. Methods 1. A male volunteer (26 years old, 170 cm tall, weight 60kg) was scanned by 64 row CT scanner (Siemens). A history of ankle injuries, tumors, deformities was excluded. Under the condition of neutral position without load, based on the anatomical structure of ankle joint, the three-dimensional finite element model of the whole foot including bone and soft tissue around foot and articular ligament was constructed by using three-dimensional processing software Mimics,Hypermesh,Abaqus etc. According to the results of Gefen.A 's ankle gait analysis method, the whole model is rotated counterclockwise in the coordinate system for 30o. then the ground is constructed. The whole foot model forms 30os with the ground, forming the state of forefoot landing and hind foot lifting 30o. Then apply gravity to the section of the tibia and fibula (vertical direction, 600N), simulate the dynamic process of the hind foot, and study the stress distribution and displacement of the anterior malleolus during the landing of the hind foot. To investigate the mechanism of multiple anterior malleolus impact in landing phase. By comparing the results of the three dimensional finite element model with that of the foreign finite element model, the accuracy and validity of the finite element model in this experiment are verified. Results 1. The establishment of full foot digital 3D finite element model; Based on the CT image data of ankle and foot of a male volunteer, a finite element model of the whole foot with 28 bone structures, 56 ligaments and soft tissue around the foot was established, with 219599 nodes and 938845 units. The results of finite element model analysis show that the stress and displacement of the ankle joint increase continuously during the process of stepping on the ground. When the model and the ground are 30 o, the stress peak value of the ankle joint is 0.058 MPA and the displacement peak value is 0.5633 mm; When the model and ground are 25 o, the peak stress of ankle joint is 0.085 MPA, the peak value of displacement is 0.7359mm, when the model and ground is 20o, the peak value of stress and displacement of ankle joint is 0.116MPa and 0.9486mm, respectively. When the model and ground are 15 o, the peak stress of ankle joint is 0.152 MPA, the peak value of displacement is 1.1703 mm, when the model and ground is 10 o, the peak value of stress and displacement of ankle joint is 0.188 MPA and 1.3981 mm, respectively. When the model and ground are 0 o, the peak stress of ankle joint is 0.225 MPA and the peak value of displacement is 1.6255 mm. The stress peak of the ankle was always located at the lateral side of the anterior malleolus and increased continuously, from 0.085MPa to 0.225 MPA, and the anterior malleolus displacement increased from 0.563mm to 1.6255 mm. Conclusion 1, the 3D finite element model constructed in this study is accurate, complete, and the simulation of the model is good, and it can reflect the complex 3D information of ankle and foot completely. 2, in the normal landing process, The front of the ankle always has maximum stress and displacement, so it is most likely to impact.
【學(xué)位授予單位】：安徽醫(yī)科大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：R684
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