Comparisons of the Bending Strength of Cylindrical, Conical and Dual Core Pedicle Screws: An Application of Finite Element Analyses

Yongyut Amaritsakul, Ching-Chi Hsu, and Ching-Kong Chao


Pedicle screw, Finite element analyses


There are several commercial screw designs, such as a cylindrical screw, a conical screw and dual core screw, have been widely used to treat spinal injuries. However, previous studies have only focused on cylindrical and conical screws and there is no biomechanical study to compare the performance of those designs head to head. Therefore, the aim of this study was to investigate the bending strength of those screws by using the advantage of finite element method (FEM). The results from this study showed that the conical screw type 1 had the smallest maximum tensile stress, which was about 580-590 MPa. The maximum tensile stress always occurred at the proximal part of the screw. In conclusion, the conical screw type 1 was the strongest design compared to the other screws. The weakest screws were screw No.8.

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