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題名 | 骨質疏鬆腰椎之有限元素分析=The Osteoporotic Lumbar Spine Finite Element Analysis |
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作者 | 陳守義; 張志涵; 林瑞模; 林鼎勝; Chen, S. I.; Chang, C. H.; Lin, R. M.; Lin, T. S.; |
期刊 | 中華醫學工程學刊 |
出版日期 | 19990900 |
卷期 | 19:3 1999.09[民88.09] |
頁次 | 頁219-227 |
分類號 | 415.596 |
語文 | chi |
關鍵詞 | 骨質疏鬆; 腰椎; 有限元素; Osteoporosis; Lumbar spine; Finite element; |
中文摘要 | 本研究透過 CT 資料建立腰椎三維有限元素網格,其在幾何外形及材料特性上能 更真實表現人體之脊椎特性,並將此模型實際應用於臨床骨質疏鬆之模擬分析。研究中透過 材料參數的變化,模擬骨質疏鬆症不同程度骨質流失的狀況,對椎骨內部力學分佈和傳導的 影響進行探討,以瞭解椎體骨折發生的機轉,提供臨床上之參考與應用。 結果顯示當硬質骨薄殼流失在 75% 以下並伴隨著海綿骨的流失時, 終板傳遞應力至周圍硬 質骨薄殼的情形將增加,而終板向內凹陷量也就增加,此情形可能係發生雙凹變形骨折的原 因; 當硬質骨薄殼流失在 75% 以下且海綿骨骨質流失量較大於硬質骨骨質流失量時,將會 提高硬質骨薄殼前緣張應力疲勞破壞的發生機率;當硬質骨薄殼消失即硬質骨流失大於 75% 以上而接近 99% 時,使得椎體之負荷轉由海綿骨承受, 所以易於在椎體海綿骨發生碎裂性 骨折。另外當負載形式改變時,彎曲負載於正常椎體應力的表現較軸向負荷而言更為嚴重, 若加入骨質疏鬆症考量海綿骨與硬質骨材料性質的變化,彎曲負荷形式的改變對於椎體應力 變化更有加成放大且顯著的影響,此將提高骨質疏鬆造成骨折發生的機會。 |
英文摘要 | The objective of this study is to investigate the fracture behavior of osteoporotic lumbar spine using the three dimensional finite element approach. For compression loading in normal spine, due to the spongy bone strength was far weaker than cortical shell, end-plate would deform into a concave shape in the center region. The end-plate then distributed the loading to the cortical shell and resulted in a bending effect on cortical shell which generated the tension stresses in the anterior superior region of the cortical shell. In the simulation of osteoporotic spine, when the Young's modulus of the cortical shell reduced less than 75% and spongy bone decreased more than cortical shell, the end-plate concave deformation become more serious, which resulted in biconcave fracture of the spine. When the Young's modulus of the cortical shell reduced less than 75% (accompany with spongy bone lose) this would enhanced superior tension stress of cortical shell and probably cause the anterior wedge fracture of the spine. When the cortical shell vanished (cortical shell Young's modulus reduced 99%), the stresses of the spongy bone increased dramatically which might be the reason of the crush fracture of the spine. Considering the flexion loading condition, the stresses pattern of normal spine model was altered into a more curcial case, and this phenomenon was more sensitive in osteoporotic model which will increase the probability of osteoporotic fracture. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。