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Published in:
2020 | OriginalPaper | Chapter
Biomechanical Analysis of Pullout Strength of Spinal Pedicle Screws with Full Insertion and Back-Out Using Finite Element Method
Authors : Yu-You Chen, Chian-Yun Hsu, Kao-Shang Shih, Ching-Chi Hsu
Published in: Future Trends in Biomedical and Health Informatics and Cybersecurity in Medical Devices
Publisher: Springer International Publishing
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Abstract
Pedicle screws might be backed out after screw insertion. Past studies had evaluated the pedicle screws with full insertion and back-out using experimental approaches. Unfortunately, there is rare study to investigate this problem using numerical approaches. Thus, the purpose of this study was to analyze the pullout performance of spinal pedicle screws with fully inserted setting or backed out using finite element method.
Twelve types of spinal pedicle screws were developed using SolidWorks. Each screw with the full insertion, backed-out 90o, and backed-out 180o were considered to evaluate their pullout performance using ANSYS Workbench. Additionally, a bone compaction technique was developed and applied in the present study.
The results showed that the pullout performance of the conical pedicle screws was significantly reduced compared to that of the cylindrical pedicle screws in situation of screw back-out. Both the screw geometry and bone compaction effect were the key parameters for the evaluation of pullout performance.