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凹陷角
相关语句
  concave angle
     The influence of endplate concave angle on the mechanical response of lumbar motion segment:a finite element analysis
     终板凹陷角变化对腰椎运动节段生物力学影响的有限元分析
短句来源
     Results:①There was no significant difference between male and female in concave angle of vertebral end-plates (P>0.05);
     结果 :①终板凹陷角在男女两性间差异无显著性 (P >0 0 5 ) ;
短句来源
     ②The concave angle of vertebral end-plates was significant increased from the control group and light degeneration group to severe degeneration group (P<0.05);
     ②终板的凹陷角在对照组、腰椎间盘轻度和重度退变组逐渐增大 ,两两间差异有显著性 (P <0 0 5 ) ;
短句来源
     Correlation between the concave angle of vertebral end-plate and lumbar disc degeneration
     椎体终板的凹陷角与腰椎间盘退变的相关性
短句来源
     Results:The decrease in the endplate concavity, simulated by an increasing endplate concave angle would result in decreased strains of the endplate and vertebral body, increased disc stiffness and nucleus pressure, decreased annular fiber stress, radial disc bulge and stress in the annulus ground substance,and simultaneously produce decreased facet contact force and stresses in posterior structure.
     结果:负载条件下,终板凹陷角增加、终板凹陷程度减小可导致终板-椎间盘界面应变减小,椎间盘刚度及髓核内压增加,椎间盘膨出、纤维环纤维张应力、纤维环基质应力、腰椎后部结构应力以及关节突接触力减小。
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  “凹陷角”译为未确定词的双语例句
     (5) There is no MRI signal change of endplate in control group.
     2.对照组各水平终板凹陷角在男女间差异均无显著性意义(p>0 .05); 不同水平终板凹陷角比较,L4和L5下终板凹陷角无显著性差异
短句来源
  相似匹配句对
     angle.
    
短句来源
     A New Type of Angle Acceleration Sensor
     加速度传感器
短句来源
     Study on Corner Sink and Vertical Cracks of CC Steel Billet
     连铸坯凹陷及纵向裂纹的研究
短句来源
     Correlation between the concave angle of vertebral end-plate and lumbar disc degeneration
     椎体终板的凹陷与腰椎间盘退变的相关性
短句来源
     (2)subsidence stage;
     (2) 凹陷阶段;
短句来源
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Objective:To investigate the concave angle of vertebral end-plate in low lumbar spine,and the changes of the angle during lumbar disc degeneration.Methods:129 subjects were divided into three groups.There were 27 asymptomatic volunteers with 54 discs (27 for L 4,5 discs and 27 for L 5S 1 discs) in control group.102 patients with lumbar disc degeneration were divided into two groups:light degeneration group with 99 discs (53 for L 4,5 discs...

Objective:To investigate the concave angle of vertebral end-plate in low lumbar spine,and the changes of the angle during lumbar disc degeneration.Methods:129 subjects were divided into three groups.There were 27 asymptomatic volunteers with 54 discs (27 for L 4,5 discs and 27 for L 5S 1 discs) in control group.102 patients with lumbar disc degeneration were divided into two groups:light degeneration group with 99 discs (53 for L 4,5 discs and 46 for L 5S 1 discs) and severe degeneration group with 59 discs (31 for L 4,5 discs and 28 for L 5S 1 discs).Radiograph and MR of lumbar spine were performed on every case and the images were input into personal computer.The concave angle of vertebral end-plate from inferior surface of L 4 to that of L 5 were measured by means of image analysis software and the signal change of vertebral body marrow were observed on T2-weighted MRI,the relative heights and sagittal diameters of L 4 and L 5 were also measured by the same software on radiograph.Results:①There was no significant difference between male and female in concave angle of vertebral end-plates (P>0.05);②The concave angle of vertebral end-plates was significant increased from the control group and light degeneration group to severe degeneration group (P<0.05);③The relative anterior and posterior heights of vertebral body significantly decrease from the control group and light degeneration group to severe degeneration group,but the relative sagittal diameters significantly increase (P<0.05);④The ratio of the signal intensity changes in vertebral body marrow showed significantly difference between light degeneration group (24%) and severe degeneration group (44%) (P<0.05).Conclusion:In patients with lumbar disc degeneration,the concavity of end-plate is becoming flat which corresponds with the severity of degeneration;it is mainly due to the decrease of height and the increase of sagittal diameter of vertebral body caused by the remodeling of vertebral bone and is likely a protective mechanism for the change of biomechanics.

目的 :研究下腰椎椎体终板的凹陷角以及它在腰椎间盘退变时的变化规律。方法 :12 9例研究对象依据椎间盘退变情况分成 3组 :对照组 2 7例 ,共 5 4个椎间盘 (L4,5、L5S1椎间盘各 2 7个 ) ;腰椎间盘退变 10 2例 ,共 15 8个椎间盘 (L4,5椎间盘 84个 ,L5S1椎间盘 74个 ) ,按退变程度分为 2组 :腰椎间盘轻度退变组 ,共 99个椎间盘 (L4,5椎间盘 5 3个 ,L5S1椎间盘 4 6个 ) ;腰椎间盘重度退变组 ,共 5 9个椎间盘 (L4,5椎间盘 31个 ,L5S1椎间盘 2 8个 )。所有病例摄腰椎正侧位X线片及腰椎MR检查 ,将X线片及MR图像输入计算机。在MRI正中矢状面T2加权像上测量终板凹陷角 ,并观察退变椎间盘相邻椎体骨髓的MRI信号改变 ;在X线片上测量椎体的相对前高、后高和矢状径。结果 :①终板凹陷角在男女两性间差异无显著性 (P >0 0 5 ) ;②终板的凹陷角在对照组、腰椎间盘轻度和重度退变组逐渐增大 ,两两间差异有显著性 (P <0 0 5 ) ;③退变椎间盘的上下位椎体的相对前高...

目的 :研究下腰椎椎体终板的凹陷角以及它在腰椎间盘退变时的变化规律。方法 :12 9例研究对象依据椎间盘退变情况分成 3组 :对照组 2 7例 ,共 5 4个椎间盘 (L4,5、L5S1椎间盘各 2 7个 ) ;腰椎间盘退变 10 2例 ,共 15 8个椎间盘 (L4,5椎间盘 84个 ,L5S1椎间盘 74个 ) ,按退变程度分为 2组 :腰椎间盘轻度退变组 ,共 99个椎间盘 (L4,5椎间盘 5 3个 ,L5S1椎间盘 4 6个 ) ;腰椎间盘重度退变组 ,共 5 9个椎间盘 (L4,5椎间盘 31个 ,L5S1椎间盘 2 8个 )。所有病例摄腰椎正侧位X线片及腰椎MR检查 ,将X线片及MR图像输入计算机。在MRI正中矢状面T2加权像上测量终板凹陷角 ,并观察退变椎间盘相邻椎体骨髓的MRI信号改变 ;在X线片上测量椎体的相对前高、后高和矢状径。结果 :①终板凹陷角在男女两性间差异无显著性 (P >0 0 5 ) ;②终板的凹陷角在对照组、腰椎间盘轻度和重度退变组逐渐增大 ,两两间差异有显著性 (P <0 0 5 ) ;③退变椎间盘的上下位椎体的相对前高、后高在对照组、腰椎间盘轻度和重度退变组逐渐减小 ,而相对矢状径逐渐增大 ,两两间比较差异均有显著性 (P <0 0 5 ) ;④椎间盘轻度、重度退变组的相邻椎体骨髓的MRI信号改变率分别为 2 4 %和 4 4 % ,差异有显著性 (P <0 0 5 )。结论 :腰椎间盘退变时 ,?

Breccia in Shulu depression was found in the middle and low of the third segment of Shahejie Formation, itisabreccia with carbonate fragment as its main constituent, and distributes skirt-shapelyon slopes in the depression. Breccia and marlstonewith breccia are familiarbreccias in the area and the former is domestic. Grain and matrix in the breccia are mainly angular and subangular carbonate clastic particles, whose parent rock were carbonate stratum of Ordovician. Mainly grain support, massive structure, infrequent...

Breccia in Shulu depression was found in the middle and low of the third segment of Shahejie Formation, itisabreccia with carbonate fragment as its main constituent, and distributes skirt-shapelyon slopes in the depression. Breccia and marlstonewith breccia are familiarbreccias in the area and the former is domestic. Grain and matrix in the breccia are mainly angular and subangular carbonate clastic particles, whose parent rock were carbonate stratum of Ordovician. Mainly grain support, massive structure, infrequent gradedbedding and others bedding, un-sorting of detrital grains and thicker breccia layer are important features of carbonate breccia in Shulu depression. Characteristics of component, fabric, structure and geologic background all reveal that the breccia in the study area is inviscous debris flow sediment of terrestrial formation.

碳酸盐角砾岩一般为内源或构造等成因,陆相沉积环境极难形成。研究发现束鹿凹陷古近系角砾岩为陆相成因。束鹿凹陷角砾岩分布于沙河街组三段中下部,在凹陷的东西斜坡地带呈裙状发育,是一种以碳酸盐岩碎屑为主的沉积岩。岩石类型为角砾岩及少量含砾泥灰岩,角砾岩具有以颗粒支撑为主,块状构造、粒序构造或其它层理构造不明显,角砾大小混杂,没有出现方向的优选,砾岩层单层厚度较大等特点;含砾泥灰岩为杂基支撑,具正粒序构造,并可见倒三角形状角砾。碳酸盐角砾岩中无论角砾还是填隙物都主要由棱角状及次棱角状碳酸盐碎屑颗粒构成,其母岩为盆地周围奥陶系及寒武系碳酸盐岩。研究认为束鹿凹陷沿缓坡分布的角砾岩属陆源非粘性碎屑流沉积产物。

Objective:To investigate the effects of variations in vertebral endplate concavity on the mechanical behaviors of the lumbar motion segment.Methods:A three-dimensional nonlinear geometrical and mechanical accurate finite element model of lumbar L 4 -L 5 segment was developed. CAD methods were used to establish three finite element models with different endplate concave angle,where disc lordosis angle, the gap of facet joint and all other geometrical parameters and finite element mesh partition were kept constant....

Objective:To investigate the effects of variations in vertebral endplate concavity on the mechanical behaviors of the lumbar motion segment.Methods:A three-dimensional nonlinear geometrical and mechanical accurate finite element model of lumbar L 4 -L 5 segment was developed. CAD methods were used to establish three finite element models with different endplate concave angle,where disc lordosis angle, the gap of facet joint and all other geometrical parameters and finite element mesh partition were kept constant. The effects of endplate concavity on the mechanical properties of the lumbar segment was studied for two moment loads (flexion and extension) and for three different direct forces (compression, anterior and posterior shear forces). Results:The decrease in the endplate concavity, simulated by an increasing endplate concave angle would result in decreased strains of the endplate and vertebral body, increased disc stiffness and nucleus pressure, decreased annular fiber stress, radial disc bulge and stress in the annulus ground substance,and simultaneously produce decreased facet contact force and stresses in posterior structure. Conclusions:The decrease of endplate concavity enhances the protective effect of the disc on the breakage of the vertebral body. Smaller endplate deformations resulted from the decreasing endplate concavity would contribute to reduction of the nutritional diffusion to the disc.

目的:研究终板凹陷程度变化对腰椎运动节段生物力学影响。方法:在以往建立的腰椎L4~5运动节段三维非线性有限元模型基础上,采用CAD方法精确构建三种不同终板凹陷角改变的有限元模型,有限元模型的椎间盘前凸角、小关节间隙等其余形态学参数及网格划分均保持一致。垂直压缩、屈曲、伸直、前后剪力5种载荷条件下,分别对三种有限元模型生物力学参数进行测试。结果:负载条件下,终板凹陷角增加、终板凹陷程度减小可导致终板-椎间盘界面应变减小,椎间盘刚度及髓核内压增加,椎间盘膨出、纤维环纤维张应力、纤维环基质应力、腰椎后部结构应力以及关节突接触力减小。结论:终板凹陷程度的减小增强了椎间盘对椎体的保护作用;同时可通过影响终板的形变减少对椎间盘的营养传递。

 
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