Screw Pullout Strength After Pedicle Screw Reposition: A Finite Element Analysis.

Research Design: Finite element analysis based on computed tomography images from the lumbar spine.

Objective: Determined the pullout strength of unsatisfactorily placed screws and repositioned screws after unsatisfactory place in lumbar spine surgery.

Background: Pedicle screws are widely used to stabilize the spinal vertebral body.