Prospective design delineation and subsequent in vitro evaluation of a new posterior dynamic stabilization system.

摘要: STUDY DESIGN Finite element and in vitro study. OBJECTIVE calculations to delineate a dynamic fixator confirmation with an experiment. SUMMARY AND BACKGROUND DATA In the last few years, there was paradigm shift from rigid fixation of spinal segments. However, some so-called implants like Dynesys performed still stiffer than anticipated. The aim this study optimize stabilization system. METHODS development steps implant design can be summarized loop. First, finite model intact human L4-L5 segment used stiffness parameters for implant, consideration clinical concerns safety aspects. These data were second step, leading final design. This process completed appropriate optimal axial bending computed reduce motion by 30%. For validation process, tests on 6 lumbar segments L2-L3 median age 52. specimens loaded pure unconstrained moments 7.5 Nm flexion, extension, lateral bending, rotation. RESULTS demonstrated advantages employing parameter delineation. It possible prospectively outline needed desired range achievement. CONCLUSION summary, FEM may accelerate realization new