腰椎有限元模型的建立与不同角度牵引条件下的仿真研究

摘要

Aim: To explore the effect of traction in different angles on lumbar discs traction in different angles . Methods:A three-dimensional finite element model of human lumbar segments L 1~5 ,and S1 was established based on med-ical CT images , and there were 148 943 nodes and 91 636 units in the model .Forces of two groups which size were respec-tively 320 and 200 N were exerted on the model based on clinical experience to simulate the traction under different traction angles such as 0°,5°,10°,15°,20°and 25°when the human body was lying down .Results:When the traction angle was 10°,the change of L4/5 was the largest,which was 2.42 mm;when the traction angle was 15°,the change of L3/4 was the lar-gest,which was 2.44 mm;when the traction angle was 20°,the change of L2/3 was the largest,which was 2.43 mm;When the traction angle was 25°,the change of L1/2 was the largest,which was 2.46 mm.Conclusion:The specific lesion of in-tervertebral discs can be better treated by adjusting the traction angle .%目的：探讨不同角度牵引对腰椎间盘的影响。方法：基于医用CT图像建立人体腰椎L1～5、S1节段的三维有限元模型，模型共有148943个节点，91636个单元。对模型施加320 N的牵引力，模拟人体平躺时斜向上0°、5°、10°、15°、20°和25°牵引。结果：与其他几个牵引角度相比，当斜向上10°牵引时，椎间盘L4/5伸长量最大，为2．42 mm；斜向上15°牵引时，椎间盘L3/4伸长量最大，为2．44 mm；斜向上20°牵引时，椎间盘L2/3伸长量最大，为2．43 mm；斜向上25°牵引时，椎间盘L1/2伸长量最大，为2．46 mm。结论：通过调整牵引角度可以对病变的腰椎间盘进行有针对性的治疗。