Introduction-The cervical spine is subjected to injury frequently,especially among pilots who are usually on the condition of high acceleration.Injuries of the cervical spine will be potential risk of damage to the sp...Introduction-The cervical spine is subjected to injury frequently,especially among pilots who are usually on the condition of high acceleration.Injuries of the cervical spine will be potential risk of damage to the spinal cord,which could be result in life threatening展开更多
The difficulty in establishing the finite element model of head and cervical spine is interpreted in the study. A head-neck 3D model is constructed accurately and quickly by the technology of CT scan,the automatically...The difficulty in establishing the finite element model of head and cervical spine is interpreted in the study. A head-neck 3D model is constructed accurately and quickly by the technology of CT scan,the automatically modeling of Mimics software and the RE technology of Geomagic software. Then the finite element model of the head-neck which is close to the real one is set up by the preprocessor of the FEM soft ware ANSYS. After the transient finite element analysis is performed on the model,the historical response of the displacement of the head is obtained. The result is validated by the result of the existed experiment. The stress,as well as the deformation,of nodes in the head and the cervical spine at any time benefits a lot to the clinic study on the injure to the head and neck caused by the impacts. And all the analysis is done by limited computer available.展开更多
Lumbar vertebral body(VB) fractures are increasingly common in an ageing population that is at greater risk of osteoporosis and metastasis. This review aims to identify different models, as alternatives to bone minera...Lumbar vertebral body(VB) fractures are increasingly common in an ageing population that is at greater risk of osteoporosis and metastasis. This review aims to identify different models, as alternatives to bone mineral density(BMD), which may be applied in order to predict VB failure load and fracture risk. The most representative models are those that take account of normal spinal kinetics and assess the contribution of the cortical shell to vertebral strength. Overall, predictive models for VB fracture risk should encompass a range of important parameters including BMD, geometric measures and patient-specific factors. As interventions like vertebroplasty increase in popularity for VB fracture treatment and prevention, such models are likely to play a significant role in the clinical decision-making process. More biomechanical research is required, however, to reduce the risks of post-operative adjacent VB fractures.展开更多
As the elderly population continues to grow, the number of patients with low back pain is gradually increasing. Among them, Lumbar Degenerative Diseases (LDD) is one of the major contributors to low back pain. Biomech...As the elderly population continues to grow, the number of patients with low back pain is gradually increasing. Among them, Lumbar Degenerative Diseases (LDD) is one of the major contributors to low back pain. Biomechanical in vivo studies of the lumbar spine are mainly performed by implants or imaging data to record the real-time changes of form and stress on the intervertebral disc during motion. However, the current developments are slow due to the technological and ethical limitations. In vitro experiments include animal experiments and cadaver experiments, which are difficult to operate or differ greatly from normal human structures, and the results still need to be verified repeatedly to test their accuracy. As for finite element method, it is relatively low cost and can repeat the experimental results. Therefore, we believe that finite element analysis plays an extremely important role in biomechanical research, especially in analyzing the relationship between different surgical models and the degeneration caused by different mechanics.展开更多
目的建立健康志愿者、髋关节发育不良(development dysplasia of the hip,DDH)患者手术前后股骨-骨盆-腰椎模型,研究弧形髋臼截骨术对腰椎生物力学影响。方法利用CT扫描获取4名DDH患者手术前后以及1名健康志愿者股骨-骨盆-腰椎DICOM数据...目的建立健康志愿者、髋关节发育不良(development dysplasia of the hip,DDH)患者手术前后股骨-骨盆-腰椎模型,研究弧形髋臼截骨术对腰椎生物力学影响。方法利用CT扫描获取4名DDH患者手术前后以及1名健康志愿者股骨-骨盆-腰椎DICOM数据,构建三维有限元模型。在Geomagic中采用偏移命令划分皮质骨与松质骨,在SolidWorks中添加腰椎软骨、骶髂关节、耻骨联合等软骨,在ANASYS中对模型进行有限元分析,步态为慢走中的单腿支撑中期相。分析对比DDH患者手术前后腰椎生物力学变化,将患者术后腰椎生物力学数据与健康志愿者进行对比。结果建立了4组患者和1组健康志愿者股骨-骨盆-腰椎模型,模型在各工况下结果均在所参考的文献范围内,证明模型有效。患者术后腰椎、股骨颈、纤维环与髓核所受应力远小于患者术前的状态,患者术后腰椎、股骨颈、纤维环与髓核所受应力与健康志愿者相近。结论弧形髋臼截骨术在治疗DDH后会显著降低腰椎、椎间盘所受应力,纤维环与髓核受力也更加均匀,说明弧形髋臼截骨术会将患者调整到健康状态。研究结果为临床治疗DDH提供了生物力学依据,有助于优化手术方案。展开更多
文摘Introduction-The cervical spine is subjected to injury frequently,especially among pilots who are usually on the condition of high acceleration.Injuries of the cervical spine will be potential risk of damage to the spinal cord,which could be result in life threatening
文摘The difficulty in establishing the finite element model of head and cervical spine is interpreted in the study. A head-neck 3D model is constructed accurately and quickly by the technology of CT scan,the automatically modeling of Mimics software and the RE technology of Geomagic software. Then the finite element model of the head-neck which is close to the real one is set up by the preprocessor of the FEM soft ware ANSYS. After the transient finite element analysis is performed on the model,the historical response of the displacement of the head is obtained. The result is validated by the result of the existed experiment. The stress,as well as the deformation,of nodes in the head and the cervical spine at any time benefits a lot to the clinic study on the injure to the head and neck caused by the impacts. And all the analysis is done by limited computer available.
文摘Lumbar vertebral body(VB) fractures are increasingly common in an ageing population that is at greater risk of osteoporosis and metastasis. This review aims to identify different models, as alternatives to bone mineral density(BMD), which may be applied in order to predict VB failure load and fracture risk. The most representative models are those that take account of normal spinal kinetics and assess the contribution of the cortical shell to vertebral strength. Overall, predictive models for VB fracture risk should encompass a range of important parameters including BMD, geometric measures and patient-specific factors. As interventions like vertebroplasty increase in popularity for VB fracture treatment and prevention, such models are likely to play a significant role in the clinical decision-making process. More biomechanical research is required, however, to reduce the risks of post-operative adjacent VB fractures.
文摘As the elderly population continues to grow, the number of patients with low back pain is gradually increasing. Among them, Lumbar Degenerative Diseases (LDD) is one of the major contributors to low back pain. Biomechanical in vivo studies of the lumbar spine are mainly performed by implants or imaging data to record the real-time changes of form and stress on the intervertebral disc during motion. However, the current developments are slow due to the technological and ethical limitations. In vitro experiments include animal experiments and cadaver experiments, which are difficult to operate or differ greatly from normal human structures, and the results still need to be verified repeatedly to test their accuracy. As for finite element method, it is relatively low cost and can repeat the experimental results. Therefore, we believe that finite element analysis plays an extremely important role in biomechanical research, especially in analyzing the relationship between different surgical models and the degeneration caused by different mechanics.
文摘目的建立健康志愿者、髋关节发育不良(development dysplasia of the hip,DDH)患者手术前后股骨-骨盆-腰椎模型,研究弧形髋臼截骨术对腰椎生物力学影响。方法利用CT扫描获取4名DDH患者手术前后以及1名健康志愿者股骨-骨盆-腰椎DICOM数据,构建三维有限元模型。在Geomagic中采用偏移命令划分皮质骨与松质骨,在SolidWorks中添加腰椎软骨、骶髂关节、耻骨联合等软骨,在ANASYS中对模型进行有限元分析,步态为慢走中的单腿支撑中期相。分析对比DDH患者手术前后腰椎生物力学变化,将患者术后腰椎生物力学数据与健康志愿者进行对比。结果建立了4组患者和1组健康志愿者股骨-骨盆-腰椎模型,模型在各工况下结果均在所参考的文献范围内,证明模型有效。患者术后腰椎、股骨颈、纤维环与髓核所受应力远小于患者术前的状态,患者术后腰椎、股骨颈、纤维环与髓核所受应力与健康志愿者相近。结论弧形髋臼截骨术在治疗DDH后会显著降低腰椎、椎间盘所受应力,纤维环与髓核受力也更加均匀,说明弧形髋臼截骨术会将患者调整到健康状态。研究结果为临床治疗DDH提供了生物力学依据,有助于优化手术方案。
