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Investigating the mechanical effect of the sagittal angle of the cervical facet joint on the cervical intervertebral disc

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机构: [1]Guangzhou Univ Chinese Med, Dept Spinal Surg, Affiliated Hosp 3, Guangzhou, Peoples R China [2]Guangdong Res Inst Orthoped & Traumatol Chinese M, Guangzhou, Peoples R China [3]Guangzhou Univ Chinese Med Futian, Dept Spinal Surg, Shenzhen Hosp, Shenzhen, Peoples R China [4]Dongguan Hosp Tradit Chinese Med, Dept Spinal Surg, Dongcheng Dist, Dongguan, Peoples R China [5]Guangzhou Univ Chinese Med, Dept Spinal Surg, Affiliated Hosp 1, Guangzhou, Peoples R China [6]Yueyang Hosp Tradit Chinese Med, Dept Spinal Surg, Shanghai, Peoples R China [7]Guangzhou Univ Chinese Med, Affiliated Hosp 1, Baiyun Hosp, Helong 7 Rd, Guangzhou 510000, Guangdong, Peoples R China
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关键词: Sagittal angle of facet joint cervical intervertebral disc annulus fibres stress finite-element analysis

摘要:
Background Facet tropism is defined as the asymmetry between the left and right facet joints relative to the sagittal plane. Published clinical studies have found that facet tropism is associated with cervical disc herniation. However, the relationship between the facet orientation and the side of cervical disc herniation remains controversial. Therefore, this study used the finite-element technique to investigate the biomechanical effects of the sagittal angle of the cervical facet joints on the cervical intervertebral disc. Objective The biomechanical effects of the sagittal angle of the cervical facet joint on the cervical disc and facet joint were investigated using the finite-element technique. Methods The finite-element model was constructed using computed tomography scans of a 26-year-old female volunteer. First, a cervical model was constructed from C3 to C7. The model was verified using data from previously published studies. Second, the facet orientation at the C5-C6 level was altered to simulate different sagittal angles of cervical facet joints. Five models, F70, F80, F90, F100, and F110, were simulated with different facet joint orientations (70 degrees, 80 degrees, 90 degrees, 100 degrees, and 110 degrees facet joint angles at the left side, respectively, and 90 degrees facet joint angles at the right side) at the C5-C6 facet joints. In each model, annular fibres stress and facet cartilage pressure were studied under six pure moments and two combined moments. Results Comparing the stress of the annulus fibres in flexion combined with right axial rotation and in flexion combined with left axial rotation in the same model, no difference in the maximum stress of the annulus fibres was noted between these two different moments in the F90 model, whereas differences of 12.80%, 8.84%, 14.95% and 33.32% were noted in the F70, F80, F100 and F110 models, respectively. The same trend was observed when comparing the maximum stress of the annulus fibres in each model during left and right axial rotation. No differences in annular fibres stress and facet cartilage pressure were noted among the five models in flexion, extension, lateral bending, left axial rotation, and flexion combined with left axial rotation in this study. However, compared with the F70 model in flexion combined with right axial rotation, the annulus fibres stress of the F80, F90, F100, and F110 models increased by 5.53%, 13.03%, 35.04%, and 72.94%, respectively, and the pressure of the left facet joint of these models decreased by 5.65%, 12.10%, 18.41%, and 25.74%, respectively. The same trend was observed in the right axial moment. Conclusion Facet tropism leads to unbalanced stress distribution on the annulus fibres at the cervical intervertebral disc. The greater the sagittal angle of the facet joint, the greater the annular fibres stress on this side. We hypothesised that the side with the larger sagittal angle of the facet joint exhibits a greater risk of disc herniation.

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出版当年[2021]版:
大类 | 4 区 医学
小类 | 4 区 卫生保健与服务 4 区 公共卫生、环境卫生与职业卫生 4 区 医学:信息 4 区 卫生政策与服务
最新[2025]版:
大类 | 3 区 医学
小类 | 3 区 卫生保健与服务 3 区 卫生政策与服务 3 区 公共卫生、环境卫生与职业卫生 4 区 医学:信息
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出版当年[2020]版:
Q1 HEALTH POLICY & SERVICES Q1 PUBLIC, ENVIRONMENTAL & OCCUPATIONAL HEALTH Q2 MEDICAL INFORMATICS Q2 PUBLIC, ENVIRONMENTAL & OCCUPATIONAL HEALTH Q2 HEALTH CARE SCIENCES & SERVICES
最新[2024]版:
Q1 HEALTH CARE SCIENCES & SERVICES Q1 HEALTH POLICY & SERVICES Q1 PUBLIC, ENVIRONMENTAL & OCCUPATIONAL HEALTH Q3 MEDICAL INFORMATICS

影响因子: 最新[2024版] 最新五年平均 出版当年[2020版] 出版当年五年平均 出版前一年[2019版] 出版后一年[2021版]

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第一作者机构: [1]Guangzhou Univ Chinese Med, Dept Spinal Surg, Affiliated Hosp 3, Guangzhou, Peoples R China [2]Guangdong Res Inst Orthoped & Traumatol Chinese M, Guangzhou, Peoples R China
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通讯机构: [4]Dongguan Hosp Tradit Chinese Med, Dept Spinal Surg, Dongcheng Dist, Dongguan, Peoples R China [5]Guangzhou Univ Chinese Med, Dept Spinal Surg, Affiliated Hosp 1, Guangzhou, Peoples R China [7]Guangzhou Univ Chinese Med, Affiliated Hosp 1, Baiyun Hosp, Helong 7 Rd, Guangzhou 510000, Guangdong, Peoples R China [*1]Dongguan Hosp Tradit Chinese Med, 22 Songshan Lake Ave, Dongcheng Dist 523000, Dongguan, Peoples R China [*2]Baiyun Hospital of the First Affiliated Hospital of Guangzhou University of Chinese Medicine, Helong 7 Road, Baiyun District, Guangzhou, 510000, China
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