基于有限元分析腰椎内固定的生物力学特征 |
| |
作者姓名: | 陶 勇 吴云乐 宗少晖 李柯柯 杜 力 彭小明 施雄志 胡溪源 |
| |
作者单位: | 广西医科大学第一附属医院脊柱骨病外科,广西壮族自治区南宁市 530000 |
| |
摘 要: |
|
关 键 词: | 骨科植入物 脊柱植入物 腰椎 椎板切除 椎弓根螺钉 有限元 脊柱 生物力学 Mimics |
收稿时间: | 2016-02-22 |
Biomechanical characteristics of lumbar vertebra fixation based on finite element analysis |
| |
Authors: | Tao Yong Wu Yun-le Zong Shao-hui Li Ke-ke Du Li Peng Xiao-ming Shi Xiong-zhi Hu Xi-yuan |
| |
Institution: | Department of Spine Osteopathia, the First Affiliated Hospital of Guangxi Medical University, Nanning 530000, Guangxi Zhuang Autonomous Region, China |
| |
Abstract: | BACKGROUND: Posterior lamina resection often causes loss of spinal stability, so screw rod internal fixation technology is needed to maintain the stability of lumbar spine. Finite element analysis can be used to simulate the stress distribution of the spine and internal fixation system after spinal surgery.
OBJECTIVE: To build three-dimensional finite element model of spinal L1 to L3, analyze the spinal stability and stress distribution after the total laminectomy and insertion of bilateral pedicle screw using finite element method.
METHODS: L1-L3 CT data could be collected from an adult healthy male volunteer. Mimics14.01, 3-matic(V6.0) and Ansys 15.0 could be used to set up the intact lumbar spine finite element model of L1-L3 (group A), the L1-L3 finite element model after L2 total laminectomy (group B), and the finite element model of L2 total laminectomy and insertion of bilateral pedicle screw (group C). We used software to simulate flexion, extension, lateral bending and axial rotation, and three kinds of models received finite element analysis.
RESULTS AND CONCLUSION: (1) Based on the maximum of Von Mises under different motion states, the maximum stress was significantly lower in group A than in group B (P < 0.05). The maximum stress was significantly lower in group B than in group C (P < 0.05). (2) Based on the total deformation under different motion states, the total deformation was significantly lower in group A than in group B (P < 0.05). The total deformation was significantly lower in group C than in groups A and B (P < 0.05). (3) After the total laminectomy, vertebral body stress increased, especially in the lamina, pedicle and joints. The range of motion of the vertebral body increased, which influenced the stability of the vertebral body. Internal fixation could decrease range of motion. Stress concentrated on the screw. Stress on the vertebral plate and pedicle decreased. The stability of vertebral body increased. Excessive stress concentrated on screw system will increase the risk of screw breakage. |
| |
Keywords: | |
|
| 点击此处可从《》浏览原始摘要信息 |
| 点击此处可从《》下载免费的PDF全文 |
|