Finite element analysis of the screw in percutaneous axial lumbosacral interbody fusion.
OBJECTIVE
To establish a three-dimensional finite element model of the L(5)/S(1) motion segment with percutaneous axial lumbosacral screw and analyze the biomechanical stress on the screw.


METHODS
With the help of related software and the Mechanical Virtual Human of China, a three-dimensional finite element model was established. Three different loading conditions on the screw were analyzed with this model.


RESULTS
Peak stresses on the screw under three loading conditions were 175.334 MPa, 183.765 MPa and 146.237 MPa, respectively. Generally, stress values were relatively low. The stress values were relatively high at the point of interbody fusion and middle part of the screw, all the highest values being localized to the upper and lower threads closest to the middle part. Comparison among the three conditions showed that torque load was the greatest, followed by vertical load, with lateral bending being the least.


CONCLUSIONS
Percutaneous axial lumbosacral screw easily meets normal loading conditions and may be an effective method for lumbosacral fusion.
Department of Orthopaedics, Yijishan Hospital, Wannan Medical University, Wuhu, China. xuhg@medmail.com.cn
Hong-guang
HG
Xu
Xiao-ming
XM
Yang
Tian-liang
TL
Wu
Hong
H
Wang
Xue-wu
XW
Chen
Ling-ting
LT
Wang
Song
S
Jin
Ping
P
Liu
D001696:Biomechanical Phenomena; D001863:Bone Screws; D020342:Finite Element Analysis; D006801:Humans; D008159:Lumbar Vertebrae / Q000601:surgery*; D008161:Lumbosacral Region; D012447:Sacrum / Q000601:surgery*; D013123:Spinal Fusion / Q000295:instrumentation* / Q000379:methods; D013314:Stress, Mechanical; D016474:Weight-Bearing