https://scholars.lib.ntu.edu.tw/handle/123456789/65010
標題: | 膝關節運動中韌帶纖維徵召與形狀改變之數學模擬 Mathematical Modeling of the Fibre Recruitment and Shape Changes of Knee Ligaments During Motion |
作者: | 游博翔 Yu, Po-Hsiang |
關鍵字: | 膝關節;韌帶;韌帶纖維;數學模型;knee;fibre-based model;cruciate ligaments;simulation | 公開日期: | 2009 | 摘要: | 膝關節是人體中極為重要的一個關節。膝關節周遭的肌肉、韌帶、關節面之間負責的力學互動決定了膝關節的活動方式。其中十字韌帶不但連結股骨以及脛骨,提供膝關節自由度上的限制,在膝關節活動的過程中也承受拉力。由於膝關節在人體運動的過程中常承受較大的力量,因此亦常因過當的受力而產生傷害。而在過去的統計研究中發現,膝關節的傷害中,比例最高的就是韌帶的傷害,其中前十字韌帶的受傷比例高達85%,因此長久以來人們一直希望能夠了解人體活動時韌帶所承受的力量。去已有許多學者研究膝關節的運動學以及力動學,藉此進一步了解十字韌帶的受力情形。經由試體研究,學者們了解膝關節運動的過程中各骨頭之間相互運動的關係,亦了解十字韌帶在膝關節的運動中所扮演的角色,同時也對韌帶的力量形變特性有較清楚的了解。活體研究則因為在實際執行上有許多限制,因此較少學者進行此研究,轉而發展數學模型。經由數學模型,結合運動學的量測資料,就可以求出欲了解的組織內力。研究參考文獻中的模型,改進文獻中的方法,考慮十字韌帶在運動過程中的纏繞行為,以及兩側副韌帶受股骨與脛骨影響所造成的形變,進一步了解韌帶內部纖維走向以及受拉伸的程度,以更接近實際情況的幾何變化來模擬韌帶纖維拉伸分布情形。此模型從電腦斷層影像以及核磁共振影像中截取骨骼模型以及韌帶資訊,再以六軸機械手臂搭配紅外線立體攝影術進行試體實驗取得膝關節在非受力情況下的運動學資料來進行被動動作模擬以及拉伸模擬。模擬的結果與過去文獻結果相符合。 Knee joints play very important roles in human bodies. The muscles, ligaments, and joint surfaces surround knees decide the kinematics of knees. Ligaments link a femur and a tibia, limit the motion of a knee, and sustain tensile forces during the motion. nee joints sustain larger forces usually during body motions, so knees were common to be injured while people apply improper forces to them. It is reported that the injuries in ligaments have the highest percentage of the injuries in knees. 85% percent of ligament-injury happened in anterior cruciate ligament. Therefore, people tried hardly to understand how ligaments take forces during body motions.n this study, a 3-D fibre-based model of ligaments was established. Wrapping and bone-ligament interaction were considered while computing the shape of ligaments in different knee motions. As the input parameters of the model, MRI images provided data of attachment areas, and CT images provided bone model. Computer simulations of a left knee contained femur, tibia, fibula, cruciate ligaments, and collateral ligaments were performed. Shape changes of ligaments and fibre recruitment were shown via color maps, and the result were compared with literature. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/187119 |
顯示於: | 機械工程學系 |
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ntu-98-R96548024-1.pdf | 23.53 kB | Adobe PDF | 檢視/開啟 |
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