| Summary: | 碩士 === 長庚大學 === 機械工程學系 === 105 === At present, transpedicular vertebroplasty and balloon kyphoplasty are widely used in spine plastic surgery. In these two surgeries, bone cement may leak in the infusion process and vertebral may collapse again after surgery. Recently, two vertebral implant systems are proposed. One is called expandable vertebral augment system, and the other is called spinejack system implant. These two vertebral implant system can restore the original height of the vertebral body, prevent leakage of bone cement in the infusion process, and provide a support on bone cement. However, there is no biomechanical research about spinejack system yet. The purpose of this study is to draw three dimensional view of spinejack, and analyze the biomechanical effects of implants of spinejack system.
The biomechanical effects of spinejack system implants in the vertebral body after implantation are analyzed. The analyses are divided into three stages. Firstly, draw the spinejack system implants by graphic software, and analyze the mechanical characteristics of the expandable spinal implant by finite element method. Secondly, analyze the biomechanical properties of the expansion of the implants in the spine. Thirdly, analyze the stiffness of the whole spine, which the bone cement and the implant are embedded in.
The results show that the maximum thrust required for spinejack system implants is lower than that of expandable vertebral augment system implants. In the third stage analysis, both the stiffness and the maximum support force of the vertebral body do not increase significantly. Therefore, the main function of the implant is to provide some space for the injection of bone cement, and make bone cement attached firmly. The expandable vertebral augment system has larger stiffness and maximum support force than those of the spinejack system.
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