Department of Orthopaedic Surgery, Graduate School of Medicine, Mie University, 2-174 Edobashi, Tsu City, Mie Prefecture 514-8507, Japan.
J Clin Neurosci. 2010 Mar;17(3):364-7. doi: 10.1016/j.jocn.2009.06.017. Epub 2010 Jan 13.
Lumbar fusion combined with unilateral pedicle screw fixation has received favourable clinical reports. However, there are very few reports about the biomechanical properties of this system. The purpose of this study was to compare the biomechanics of a unilateral pedicle screw system with a bilateral system. Two fresh lumbar vertebral columns from human cadavers were used. Seven models were prepared by the sequential damage and spinal instrumentation of each specimen. Bending and rotation tests were performed to clarify the range of motion for each model using a 6-axis material tester that we have developed. We showed that the unilateral pedicle screw system offers only uneven fixation. This results in dispersion of rigidity depending on the direction of bending and rotation. The bilateral pedicle screw system, however, allows excellent fixation in all directions.
腰椎融合联合单侧椎弓根螺钉固定已获得良好的临床报告。然而，关于该系统的生物力学特性的报道却很少。本研究的目的是比较单侧椎弓根螺钉系统与双侧系统的生物力学特性。使用来自人体尸体的两个新鲜腰椎。通过对每个标本进行连续损伤和脊柱器械固定，制备了七个模型。使用我们开发的六轴材料试验机进行弯曲和旋转测试，以明确每个模型的活动范围。我们表明，单侧椎弓根螺钉系统仅提供不均匀的固定。这导致刚度的分散取决于弯曲和旋转的方向。然而，双侧椎弓根螺钉系统可以在所有方向上提供良好的固定。
