Chinese Journal of Tissue Engineering Research ›› 2014, Vol. 18 ›› Issue (17): 2659-2666.doi: 10.3969/j.issn.2095-4344.2014.17.007
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Chen Hua-xing, Yang Sheng, Lu Jian-min, Yu Yan-nan, Yuan Chi, Ren Fu-quan, Liu Ji-feng, Zhao Guo-quan, Li Shu-qiang
Revised:
2014-02-28
Online:
2014-04-23
Published:
2014-04-23
Contact:
Yang Sheng, M.D., Professor, Department of Orthopedics, Affiliated Zhongshan Hospital of Dalian University, Dalian 116001, Liaoning Province, China
About author:
Chen Hua-xing, Master, Physician, Department of Orthopedics, Affiliated Zhongshan Hospital of Dalian University, Dalian 116001, Liaoning Province, China
Supported by:
the National Natural Science Foundation of China, No. 30870647
CLC Number:
Chen Hua-xing, Yang Sheng, Lu Jian-min, Yu Yan-nan, Yuan Chi, Ren Fu-quan, Liu Ji-feng, Zhao Guo-quan, Li Shu-qiang. Lumbar biomechanical characteristics after microsurgical lumbar discectomy with different proportions of nucleus pulposus: finite element analysis[J]. Chinese Journal of Tissue Engineering Research, 2014, 18(17): 2659-2666.
2.1 模型的验证 在分析不同工况下模型的有限元力学特征之前,必须要验证其有效性,理论上要求材料学模拟的结果要与实体研究结果相吻合。将界定载荷后的模型导入Ahaqus 6.9软件中求解,通过处理计算出腰椎运动节段在屈伸、侧弯、轴向旋转状态下的旋转角度,并与文献中的基础测试结果对比来考究其真实性[21-23]。如表2所示,相同的节段采用不同的载荷条件其活动范围有所差异,同等条件下运动节段的活动范围也不尽相同,屈伸和侧弯时ROM相对较大,旋转状态下的ROM相对较小,本文结果趋于接近对照平均值并且在其范围之内,证明模型有效。另一方面,有限元模型的精确度越高则与实体标本的真实程度越接近,单元格的密度越大,数目越多,构建模型的精确度越高。本文中所建立的模型总单元数为438 098个,节点数为135 482个,网格划分的密度有较大的提高,精确度得到有力保证。"
治疗前后5对数值在6种载荷下的位移做配对t检验(满足正态分布),经过SPSS 10.1软件统计分析,结果单纯开窗组与退变模型组在各种载荷下的位移改变差异无显著性意义(P > 0.05);髓核摘除组与退变模型组比较在屈伸及旋转状态下位移改变明显,差异有显著性意义(P < 0.05),在侧弯状态下改变不明显(P > 0.05),说明髓核摘除后在左、右侧弯状态下对腰椎稳定性的影响不大。图2为4组模型在6种载荷下的平均位移图,可以看出单纯开窗组与退变模型组的位移改变影响不大,与退变模型组相比,髓核摘除模型组在前屈、后伸及左、右旋转状态位移改变较为明显,其中全髓核摘除后在前屈及后伸状态下增大最为明显,分别增大了21.65%和26.89%。"
2.3 各组模型终板、髓核、关节突及后部结构的应力分布 造模前后各模型在终板、关节突及后部结构中的应力峰值变化趋势较为相似,总体表现为同一种载荷下退变模型、单纯开窗模型、髓核1/3摘除模型、髓核全摘除模型中应力峰值依次递增。图3为4个模型L4/5椎间盘下终板在前屈状态下的应力云图,图4为4个模型L4/5椎间盘下终板在6种载荷下应力最大值的条形图。可以看出在不同的载荷下,终板的应力集中部位不同,同种载荷下不同模型间的最大应力分布极为相似,前屈、后伸状态下应力分别向终板前下方、后下方集中;左右侧弯载荷下分别集中于左后下方、右后下方;左右旋转载荷下应力分别集中于右后下方、左后下方。4个模型在6种载荷中,应力最大值出现在后伸及左侧弯曲状态下,髓核摘除模型应力最大值较退变模型均有升高,其中在前屈及左侧弯曲状态下应力峰值增加最为明显,髓核全摘除模型较退变模型组分别增大了28.1%和25.32%。"
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