Forming prediction of TA2 pedicle screw system connection rod in lumbar interbody fusion: a CPFEM-based multiscale framework.

The precision forming of pedicle screw connection rods is vital for spinal fusion safety. This study investigates the anisotropic forming behavior of TA2 titanium to enhance forming accuracy. A multiscale model integrating EBSD-based 3D-RVE and CPFEM was developed and embedded into ABAQUS to simulate springback. Results confirm that this approach significantly improves prediction accuracy. This work provides a scalable strategy for precise medical implant manufacturing.