Symptomatic adjacent segment degeneration of the cervical spine remains problematic for patients and surgeons alike. Despite advances in surgical techniques and instrumentation, the solution remains elusive. Spurred by the success of total joint arthroplasty in hips and knees, surgeons and industry have turned to motion preservation devices in the cervical spine. By preserving motion at the dis...

OBJECTIVES No studies have compared monoaxial and polyaxial pedicle screws with regard to the von Mises stress of the instrumentation, intradiscal pressures of the adjacent segment and adjacent segment degeneration. METHODS Short-segment monoaxial/polyaxial pedicle screw fixation techniques were compared using finite element methods, and the redistributed T11-L1 segment range of motion, large...

Objective: To investigate the clinical effect of Dynesys dynamic fixation for double-segmental lumbar disc herniation and the degeneration of adjacent segment. Methods: 52 patients, who received Dynesys dynamic fixation for double-segmental lumbar disc herniation in our hospital from Mar 2009 to Mar 2012, were enrolled as research subjects; among them, 34 were male and 18 were female with an av...

INTRODUCTION: Disc degeneration is a natural process and is widely prevalent. The level of disc degeneration and the type of treatment varies from person to person. Fusion is a commonly chosen treatment option. However clinical and biomechanical studies have shown that spinal levels adjacent to a fusion experience increased motion and higher stress which may lead to adjacent-segment disease [1]...

AIM The authors compared the incidence of radiologically documented and/or symptomatic adjacent segment degeneration in and between patients who underwent anterior or posterior single-level, simple discectomy. MATERIAL AND METHODS 79 patients were clinically and radiologically examined for adjacent segment degeneration (ASD). The results were compared to evaluate which approach was predominan...

BACKGROUND To examine the survival function and prognostic factors of the adjacent segments based on a second operation after thoracolumbar spinal fusion. METHODS This retrospective study reviewed 3,188 patients (3,193 cases) who underwent a thoracolumbar spinal fusion at the author's hospital. Survival analysis was performed on the event of a second operation due to adjacent segment degenera...