Modified RF Device Biomechanical Analysis And Preliminary Clinical Report

Summary of Background: Recently, many rigid instrumentation have been used including pedicle screw systems, to provide adequate stabilization. The main goals of spinal instrumentation surgery are to achieve correction of a deformity and maintain the corrected position, to improve fusion rate, and to provide immediate fixation that allows early mobilization of the patients with use of less external support. However, clinical failures of internal fixation implants for the treatment of the thoracolumbar spine are generally attributed to fatigue. Few studies have characterized changes in fixation rigidity with time or surbjected spine-implant fixation constructs to fatigue loading until failure.Study Design: An new spinal posterior fixation device was designed to achieved the surgical goals of posterior instrumentation for treatment of unstable thoracolumbar burst fractures and spondylolisthesis. An in vitro biomechanical analysis of two anterior instability patterns was performed using human cadaveric lumbosacral spines. Stiffness of the constructs was compared, and segmental motion analyses were performed.Objectives: To evaluate the new spinal posterior fixation(Modified RF) device on the models of unstable thoracolumbar burst fractures and isthmic spondylolisthesis.