Establishment and validity verification of a finite element model of normal cervical spine(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2023年第4期
- Page:
- 487-495
- Research Field:
- 生物材料与力学
- Publishing date:
Info
- Title:
- Establishment and validity verification of a finite element model of normal cervical spine
- Author(s):
- HUANG Jijun1; 2; ZHANG Hengzhu2; 3; WANG Yongxiang1; ZHANG Wendong1; YAN Zhengcun3
- 1. Department of Spine Surgery, Clinical Medical College, Yangzhou University, Yangzhou 225001, China 2. Department of Neurosurgery, the Second Affiliated Hospital of Soochow University, Suzhou 215000, China 3. Department of Neurosurgery, Clinical Medical College, Yangzhou University, Yangzhou 225001, China
- Keywords:
- Keywords: cervical spine intervertebral disc finite element analysis biomechanics
- PACS:
- R318
- DOI:
- DOI:10.3969/j.issn.1005-202X.2023.04.015
- Abstract:
- Abstract: Objective To establish a three-dimensional finite element model of cervical vertebrae C2-C7, and analyze its biomechanical characteristics for validity verification. Methods A healthy volunteer was recruited as the modeling object. The continuous CT scan of cervical spine was carried out with 64-slice spiral CT, with the scanning area set as the occipital bone to C7 vertebral vertebra. The DICOM files of the obtained images data were imported into Mimics image segmentation software for extracting the bony structure of cervical spine. After the cervical bony structure model was processed with Geomagic studio software (such as de-denoising, smoothing, patching and filling), curved solid was fitted and offset to generate cortical bone and cancellous bone, and the results were saved as STEP files. The establishments of nucleus pulposus, fibrous ring and articular cartilage, and the assembly and matching of models were completed in SolidWorks. The material properties, contact relationships, boundary conditions, and loads were assigned using Ansys Workbench. The displacements of cervical spine were measured under 6 kinds of stresses: forward flexion, backward extension, left and right lateral flexions, and left and right rotations. Results The finite element model of C2-C7 cervical vertebrae was successfully established. The angular displacements of C2-C3 in flexion and extension, lateral flexion, and rotation were 7.2°, 8.2° and 5.3°, respectively, and those were 7.2°, 8.1°, 6.2° for C3-C4, 8.1°, 7.9°, 7.8° for C4-C5, 6.9°, 5.4°, 5.2° for C5-C6, 5.7°, 4.8°, 3.7° for C6-C7, which were basically consistent with the previous biomechanical model test reports. Conclusion The finite element model of the normal cervical spine can be successfully established using finite element modeling software. The validation shows that the established model is reliable, with good biomechanical properties.
Last Update: 2023-04-25