Biomechanics of artificial pedicle fixation in a 3D-printed prosthesis after total en bloc spondylectomy: a finite element analysis

Abstract Background This study compared the biomechanics of artificial pedicle fixation in spine reconstruction with a 3-dimensional (3D)-printed prosthesis after total en bloc spondylectomy (TES) by finite element analysis. Methods A thoracolumbar (T10–L2) model was developed and validated. Two models T12 TES were established combination different methods: Model consisted long-segment posterior (T10/11, L1/2) + 3D-printed prosthesis; B two screws. The evaluated an applied 7.5 N·m axial force 200 N. We recorded analyzed following: (1) stiffness systems, (2) hardware stress (3) on endplate adjacent to prosthesis. Results strength enhanced screws pedicle, which mainly manifested as improvement rotational stability. transmission reduced rods all directions motion, especially rotation. Conclusions After TES, combined anterior 3D printed could maintain postoperative spinal stability, but adding increased stability system risk subsidence instrumentation failure.