不同关节突关节不对称衡量标准的有限元评价

doi:10.6040/j.issn.1671-7554.0.2019.1390

摘要/Abstract

摘要： 目的观察不同的下腰椎关节突关节不对称标准对相应腰椎节段的生物力学影响。方法创建L4~L5节段关节突关节对称和不对称有限元模型,包括对称模型FT 0°模型(双侧关节突关节角度均为50°)、不对称模型FT 5°模型(左侧关节突关节55°,右侧关节突关节50°)、不对称模型FT 10°模型(左侧关节突关节60°,右侧关节突关节50°)、不对称模型FT 15°模型(左侧关节突关节65°,右侧关节突关节50°),模拟正常人体前屈、后伸、左侧屈、右侧屈、左旋转、右旋转运动状态以及腰椎前剪切应力状态。对7种运动状态下各个模型的椎间盘内最大应力、椎体最大活动度、关节突关节最大接触力变化情况进行分析。结果椎间盘内最大应力的变化和椎体最大位移的变化趋势是一致的,在前剪切、前屈、后伸、侧弯、旋转的作用力下,椎间盘内最大应力FT 15°>FT 10°>FT 5°>FT 0°,同时,不对称模型向更加冠状位的一侧(左侧)旋转时的椎间盘内最大应力大于更加矢状位的一侧(右侧)。在前剪切、前屈、后伸、侧弯、旋转的作用力下,关节突关节最大接触力 FT 15°>FT 10°>FT 5°>FT 0°,在前屈和前剪切力作用力下,不对称模型关节突关节最大接触力明显增大。结论下腰椎关节突关节不对称模型的椎间盘内最大应力与椎体活动度变化相一致,随着关节突关节不对称程度的增大而增大,但5°的关节突关节不对称并不会引起明显的下腰椎椎体活动度及椎间盘内应力变化;关节突关节最大接触力随着关节突关节不对称程度增大而增大。

关键词: 下腰椎, L4~L5, 关节突关节不对称, 有限元, 生物力学

Abstract: Objective To investigate the biomechanical influence of different lower lumbar spine facet tropism(FT)criteria on the stress on the L4-L5 segment. Methods Symmetric and facet tropism finite element models of L4-L5 segment were created, including symmetrical model FT 0° model(50° facet joint angle at the bilateral side), FT 5° model(a 55° facet joint angle at the left side and a 50° facet joint angle at the right side), FT 10° model(a 60° facet joint angle at the left side and a 50° facet joint angle at the right side), FT 15° model(a 60° facet joint angle at the left side and a 50° facet joint angle at the right side). Seven stress states were simulated, including forward flexion, extension, left flexion, right flexion, left rotation, right rotation pure moments and anterior shear force. Changes of the maximum intradiscal pressure, maximum vertebral body movement and maximum facet contact force in each model under each stress state were analyzed. Results Changes of the maximum intradiscal pressure were consistent with the trend of maximum vertebral body movement. Under the force of anterior shear, flexion, extension, lateral bending and rotation, the maximum intradiscal pressure was FT 15°>FT 10°>FT 5°>FT 0°. The maximum intradiscal pressure was greater than the more sagittal side(right side)when the FT model was rotated to the more coronal side(left side). Under anterior shear force, flexion, extension, lateral bending and rotation, the maximum facet contact force was FT 15°> FT 10°> FT 5°>FT 0°. Under anterior shear force and flexion, the maximum contact force of the asymmetric joint was significantly increased. Conclusion The maximum intradiscal pressure in the FT model of the lower lumbar spine is consistent with the change of vertebral body movement, which increases with the increase of the degree of asymmetry of the facet joint angle between the left side and right side. But the facet tropism of 5° will not cause significant changes in the maximum intradiscal pressure and maximum vertebral body movement. The maximum contact force increases with the degree of asymmetry of the facet joint angle.

Key words: Lower lumbar spine, L4-L5, facet tropism, finite element, biomechanics

中图分类号:

R681.5

丁金勇,徐继禧,谭成双,刘俊城,李明波,谢炜星,任东成. 不同关节突关节不对称衡量标准的有限元评价[J]. 山东大学学报 (医学版), 2020, 58(6): 97-103.

DING Jinyong, XU Jixi, TAN Chengshuang, LIU Juncheng, LI Mingbo, XIE Weixing, REN Dongcheng. Finite element evaluation of different facet tropism criteria[J]. Journal of Shandong University (Health Sciences), 2020, 58(6): 97-103.

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