A Novel Screw head Design of Pedicle Screw for Reducing the Correction Loss in the Patients with Thoracolumbar Vertebral Fractures: A Biomechanical Study.

Study Design.A biomechanical study.Objective.To study the different biomechanical property among fixed-axis, monoplanar and polyaxial screws in the static and dynamic tests.Summary of Background Data.Correction loss is a common phenomenon in the patients with thoracolumbar vertebral fractures who un