A titanium expandable pedicle screw improves initial pullout strength as compared with standard pedicle screws.

Srilakshmi Vishnubhotla¹, William B McGarry, Andrew T Mahar, Daniel E Gelb

¹Biomechanical and Clinical Research, Alphatec Spine Inc., 5818 El Camino Real, Carlsbad, CA 92008, USA.

Abstract

BACKGROUND CONTEXT: Pedicle screws are now standard for spinal arthrodesis as they provide three-column spinal stabilization. Decreased vertebral body bone density because of aging reduces the stability of the bone-screw interface, potentially increasing screw pullout or pseudarthrosis. Modifications to standard pedicle screw designs to improve screw stabilization may help to compensate for the de…

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