Effect of the In Situ Screw Implantation Region and Angle on the Stability of Lateral Lumbar Interbody Fusion: A Finite Element Study.

Different regions of entry-exit screws induced multiple screw trajectories and influenced the stability and mechanical responses. However, different implantation angles did not. Considering the difficulty of implantation, the ipsilateral-contralateral trajectory in the lateral middle region of the VB can be optimal for in situ screw implantation in LLIF surgery.