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KMID : 1142220190140010025
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Regulatory Research on Food, Drug & Cosmetic
2019 Volume.14 No. 1 p.25 ~ p.33
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A Study on the Application of Finite Element Analysis for Physical and Mechanical Characterization of Pedicle Screw System
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Lee Hui-Sung
Kim Gun-So
Bang sun-Hee
Kwon Young-Woo
Lee Sung-Jae
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Abstract
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The pedicle screw system consists of pedicle screws, steel rods and a transverse connecting device. It can be used for treatment of degenerative disc herniation because it can provide stability through two pedicles and can be firmly fixed. ASTM F1717-18 is the standard for evaluating the physical and mechanical properties of the pedicle screw system, and it presents the experimental environment and test method including the jig for the static and dynamic fatigue test of the spinal implant in the vertebral body resection model. ASTM allows the use of finite element analysis for artificial hip joints and artificial knee joints to evaluate stress and strain, but there is no standard for the pedicle screw system. In this study, physical and mechanical data were obtained under compression, tensile and torsional loads by applying ASTM F1717 to the pedicle screw system, and the same loading conditions were applied to the finite element analysis and compared with the experimental data. In this paper, the applicability of the finite element analysis to the physical and mechanical evaluation of the pedicle screw system was investigated. Comparisons of experimental and finite element analyzes of pedicle screw system showed similar values o f stiffness and yield load under static compressive load according to ASTM F1717. Therefore, the results of this study suggest that the finite element analysis can be used to evaluate the physical and mechanical properties of the pedicle screw system.
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KEYWORD
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Spinal fixation system, ASTM, Standard, Evaluation, Finite element analysis
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