TY - JOUR
T1 - Stress distribution in vertebral bone and pedicle screw and screw–bone load transfers among various fixation methods for lumbar spine surgical alignment
T2 - A finite element study
AU - Xu, Ming
AU - Yang, James
AU - Lieberman, Isador
AU - Haddas, Ram
N1 - Publisher Copyright:
© 2018
PY - 2019/1
Y1 - 2019/1
N2 - This paper examines the stress distribution in the posterior fusion fixation, spinal range of motion (ROM), and the screw–bone interaction force obtained from various fixation methods of short-segment spine surgical alignment (SA) under five loading conditions (axial compression, flexion, extension, lateral bending, and axial rotation) provided by a FE spine model. The implant-instrumented FE spine model was validated against the experimental data in the literature. Among different fixation methods, fusing more spinal segments might help distribute the spinal load on the pedicle-screw to reduce the stress, screw force, and instability of the spine (range of motion). With longer rods, the additional intermediate screws are suggested to provide additional anchoring effect to the fixation device. However, the fact that inserting more screws also increases the stress concentration points on the rods should also be considered. Further this study supports the clinical observation that interbody cage can provide anterior support to the spine and reduce the loads on the posterior fixation devices. In both single-level and two-level fusion, IB reduced ROM, rod stress, and screw/bone interaction force.
AB - This paper examines the stress distribution in the posterior fusion fixation, spinal range of motion (ROM), and the screw–bone interaction force obtained from various fixation methods of short-segment spine surgical alignment (SA) under five loading conditions (axial compression, flexion, extension, lateral bending, and axial rotation) provided by a FE spine model. The implant-instrumented FE spine model was validated against the experimental data in the literature. Among different fixation methods, fusing more spinal segments might help distribute the spinal load on the pedicle-screw to reduce the stress, screw force, and instability of the spine (range of motion). With longer rods, the additional intermediate screws are suggested to provide additional anchoring effect to the fixation device. However, the fact that inserting more screws also increases the stress concentration points on the rods should also be considered. Further this study supports the clinical observation that interbody cage can provide anterior support to the spine and reduce the loads on the posterior fixation devices. In both single-level and two-level fusion, IB reduced ROM, rod stress, and screw/bone interaction force.
KW - Finite element method
KW - Lumbar spine
KW - Screw–bone interaction force
KW - Spine fusion surgery
KW - Stress distribution
UR - http://www.scopus.com/inward/record.url?scp=85055056177&partnerID=8YFLogxK
U2 - 10.1016/j.medengphy.2018.10.003
DO - 10.1016/j.medengphy.2018.10.003
M3 - Article
C2 - 30344069
AN - SCOPUS:85055056177
SN - 1350-4533
VL - 63
SP - 26
EP - 32
JO - Medical Engineering and Physics
JF - Medical Engineering and Physics
ER -