KMID : 1150120170030010012
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Asian Journal of Pain 2017 Volume.3 No. 1 p.12 ~ p.16
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A Finite Element Analysis of a Biodegradable Cervical Plate and Screw System
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Choi Jae-Yon
Che Lihua Kim Keung-Nyun Yi Seong Ha Yoon Yoon Do-Heum Shin Dong-Ah
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Abstract
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Objective: To evaluate a biodegradable cervical plate and screw system by 3D modeling and finite element analysis.
Methods: The authors are developing a biodegradable cervical plate and screw system using poly-L-lactic acid (PLLA). A computational model was evaluated before experimenting it into humans. The system was fabricated using 3D modeling and analyzed with finite element analysis using a commercially available software (Abaqus 6.4, Simulia, USA). Compression and bending tests were performed by applying a force of 100 N to the screw to analyze the applied von Mises stress. The screw and plate were combined, and a force of 100 N was applied to the screw to analyze the von Mises stress on the screw and plate.
Results: When a bending force of 100 N was applied to the distal 1/3 part of the screw, widening of the head and anchor of the screw, bending of approximately 20¡Æ, and concentration of von Mises stress at the pin were observed. These phenomena indicate the possibility of head and anchor fractures when severe loading is applied. When a compressive force of 100 N was applied to the screw in the plate and screw combined model, concentration of von Mises stress at the blocking parts of the plate. The phenomenon indicate the possibility of plate fracture when severe loading is applied.
Conclusion: Because biodegradable material is weak, biomechanical weakness may result in breakage of a system. According to our research, two parts of screw should be combine into one and the plate design also be modified without weak points.
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KEYWORD
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Biodegradable materials, Spinal implant, Finite element analysis, Biomechanics, Anterior cervical discectomy and fusion
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