Biomechanical Comparison between Isobar and Dynamic-Transitional Optima (DTO) Hybrid Lumbar Fixators: A Lumbosacral Finite Element and Intersegmental Motion Analysis

Figure 7

The upper screw-bone interface stress distribution at transition level was shown from the bound screw tip to posterior screw hub of the original dynamic devices. Dynesys screw exhibited a linear pattern of pedicle travel path with peak stress located at the posterior pedicle orifice of screw hub revealing 98% in flexion and 47% in extension, respectively, higher than those of the Isobar integral damper.