Design of Posterior Lumbar Fusion Internal Fixation Screws
Institute of Mechanical Engineering, Dalian Jiaotong University, Dalian 116028, China
| Abstract: | Posterior lumbar interbody fusion (PLIF) is a classic lumbar fusion procedure in spine surgery. The internal fixation screws used in the fusion procedure are the key components that are used to fix the vertebrae to the fusion device. Based on CT slice data and human anatomy theory, the finite element model (FEM) of the L1-L5 lumbar region was reconstructed using the principle of reverse engineering. Taking the L3 segment vertebral body model as an example, the screw insertion plan during the operation was determined. Then, the finite element model of screw extraction was established using the finite element software. The fixation effect of the pedicle screw embedded in the vertebral body was discussed through the finite element analysis method and orthogonal experiments, as well as the factors influencing the fixation effect of the screw. The results show that the contact area between the internal fixation screws of intervertebral fusion surgery and the cortical bone has a significantly greater impact on the fixation strength than the contact area with the cancellous bone. Choosing screws with a higher pitch and a larger outer diameter can significantly enhance their fixation effect. After considering various influencing factors comprehensively. The preferred size of the screw is an outer diameter of 6.0 mm, a pitch of 1.75 mm, and an SSA angle of 0°. This provides a basis for the design of intervertebral fusion internal fixation screws and the insertion method. |
| Keywords: | Intervertebral Fusion; Pedicle Screw; Internal Fixation; Finite Element Analysis |
| DOI: | 10.57237/j.wjcm.2025.01.002 |
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Received: 27 April 2025
Accepted: 9 July 2025
Published Online: 1 August 2025
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