Stress Analysis and Design of Vertebral Body Replacement
Date Issued
2006
Date
2006
Author(s)
Zeng, Li-Wei
DOI
zh-TW
Abstract
When a tumor growing in a vertebra, or other spine diseases, or an accidental trauma, the spine needs to proceed corpectomy vertebral body. A vertebral body replacement (VBR) is needed to implant in the spine to keep it stable and restore function. The purpose of this study is that used the finite element method to simulate a VBR that was implant in lumbar spine, to understand biomechanics conditions of the VBR made of various materials in different loading conditions.
The simulation results show that when a VBR with the help of using posterior fixation could reduce stress in the VBR, and also decreased stress concentration in the vertebral body. However posterior fixation had small influence under rotation. The vertebral body replacements made of Ti-alloy were better than those made of PEEK when taking account of safety factor and using life. Stress values in pedicle screws were also smaller when using Ti-alloy VBR than that of using PEEK VBR. The results also show that anterior fixation could only reduce stress in VBR subjected to lateral bending. However, the screws of fixation can reduce stresses in VBR, increase its life and, decrease stress shielding.
The experimental results show that the present designs of VBR can easily pass through compression tests without fracture. Raised teeth in upper endplate and lower cage can easily prick into polymer blocks without fracture.
Subjects
腰椎替代物
後方固定器,應力
vertebral body replacement
posterior fixation
stress
Type
thesis
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