TY - JOUR
T1 - Comparison of the bending performance of solid and cannulated spinal pedicle screws using finite element analyses and biomechanical tests
AU - Shih, Kao Shang
AU - Hsu, Ching Chi
AU - Hou, Sheng Mou
AU - Yu, Shan Chuen
AU - Liaw, Chen Kun
N1 - Publisher Copyright:
© 2015 IPEM.
PY - 2015/9/1
Y1 - 2015/9/1
N2 - Spinal pedicle screw fixations have been used extensively to treat fracture, tumor, infection, or degeneration of the spine. Cannulated spinal pedicle screws with bone cement augmentation might be a useful method to ameliorate screw loosening. However, cannulated spinal pedicle screws might also increase the risk of screw breakage. Thus, the purpose of this study was to investigate the bending performance of different spinal pedicle screws with either solid design or cannulated design. Three-dimensional finite element models, which consisted of the spinal pedicle screw and the screw's hosting material, were first constructed. Next, monotonic and cyclic cantilever bending tests were both applied to validate the results of the finite element analyses. Finally, both the numerical and experimental approaches were evaluated and compared. The results indicated that the cylindrical spinal pedicle screws with a cannulated design had significantly poorer bending performance. In addition, conical spinal pedicle screws maintained the original bending performance, whether they were solid or of cannulated design. This study may provide useful recommendations to orthopedic surgeons before surgery, and it may also provide design rationales to biomechanical engineers during the development of spinal pedicle screws.
AB - Spinal pedicle screw fixations have been used extensively to treat fracture, tumor, infection, or degeneration of the spine. Cannulated spinal pedicle screws with bone cement augmentation might be a useful method to ameliorate screw loosening. However, cannulated spinal pedicle screws might also increase the risk of screw breakage. Thus, the purpose of this study was to investigate the bending performance of different spinal pedicle screws with either solid design or cannulated design. Three-dimensional finite element models, which consisted of the spinal pedicle screw and the screw's hosting material, were first constructed. Next, monotonic and cyclic cantilever bending tests were both applied to validate the results of the finite element analyses. Finally, both the numerical and experimental approaches were evaluated and compared. The results indicated that the cylindrical spinal pedicle screws with a cannulated design had significantly poorer bending performance. In addition, conical spinal pedicle screws maintained the original bending performance, whether they were solid or of cannulated design. This study may provide useful recommendations to orthopedic surgeons before surgery, and it may also provide design rationales to biomechanical engineers during the development of spinal pedicle screws.
KW - Bending performance
KW - Biomechanical test
KW - Breakage
KW - Cannulated pedicle screw
KW - Finite element analysis
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U2 - 10.1016/j.medengphy.2015.06.008
DO - 10.1016/j.medengphy.2015.06.008
M3 - Article
C2 - 26208430
AN - SCOPUS:84940450826
SN - 1350-4533
VL - 37
SP - 879
EP - 884
JO - Medical Engineering and Physics
JF - Medical Engineering and Physics
IS - 9
ER -