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

Figure 6

The trade-off region of Dynesys cord stiffness was set as 50-200 N/mm because the convergent value of disc stress decussated around 50 N/mm and approached zero around 200 N/mm. In terms of a 100% degenerative model without instrumentation, the changes of ROM at L3-L4 transition segment ranged from 26% to 43%, and disc stresses ranged from 23% to -3% in flexion to reduce stiffness-related problem.