The Biomechanical Effect of Pedicle Screwsʼ Insertion Angle and Position on the Superior Adjacent Segment in 1 Segment Lumbar Fusion

Abstract

In models of 1-segment lumbar fusion surgery, the positions of pedicle screws were closely linked with corresponding disc stresses and facet contact forces. However, even in cases of facet violation by pedicle screws, removal of the pedicle screw after fusion completion can reduce facet contract forces and disc stresses under both extension and torsional moments.