Another option is expandable screws, which have been shown, in various biomechanical studies, to increase resistance to pull-out.We present a study with an expandable screw with a new design, which doubles its diameter at the level of the vertebral body, where the pedicle ends, increasing resistance to pull-out by 30% and resistance to mechanical failure by 50% in poor quality bone, compared with the normal screw.
Presentamos un estudio con un tornillo expansivo con un nuevo diseño, que dobla su diametro a nivel del cuerpo vertebral, justo donde termina el pediculo y que aumenta la resistencia al pull-out en un 30% y la resistencia al fracaso mecánico en un 50%, respecto al tornillo normal sobre hueso con mala calidad ósea.