PDF(Pubmed)
Abstract：
The success rate of spinal fusion surgery is mainly determined by the fixation strength of the spinal bone anchors. This study explores the use of an L-shaped spinal bone anchor that is intended to establish a macro-shape lock with the posterior cortical layer of the vertebral body, thereby increasing the pull-out resistance of the anchor. The performance of this L-shaped anchor was evaluated in lumbar vertebra phantoms (L1-L5) across four distinct perpendicular orientations (lateral, medial, superior, and inferior). During the pull-out experiments, the pull-out force, and the displacement of the anchor with respect to the vertebra was measured which allowed the determination of the maximal pull-out force (mean: 123 N ± 25 N) and the initial pull-out force, the initial force required to start motion of the anchor (mean: 23 N ± 16 N). Notably, the maximum pull-out force was observed when the anchor engaged the cortical bone layer. The results demonstrate the potential benefits of utilising a spinal bone anchor featuring a macro-shape lock with the cortical bone layer to increase the pull-out force. Combining the macro shape-lock fixation method with the conventional pedicle screw shows the potential to significantly enhance the fixation strength of spinal bone anchors.
摘要：
脊柱融合手术的成功率主要取决于脊柱骨锚的固定强度。这项研究探索了使用L形脊柱骨锚，旨在与椎体的后皮质层建立宏观形状的锁定，从而增加锚的拔出阻力。在腰椎体模（L1-L5）中，通过四个不同的垂直方向（侧向，中间,上级,和劣等）。在拔出实验中，拔出力，并测量锚相对于椎骨的位移，从而确定最大拉出力（平均值：123N±25N）和初始拉出力，锚开始运动所需的初始力(平均值:23N±16N)。值得注意的是,当锚固件接合皮质骨层时，观察到最大拉出力。结果证明了利用具有皮质骨层的宏观形状锁的脊椎骨锚增加拉出力的潜在益处。将宏观形状锁定固定方法与常规椎弓根螺钉相结合显示出显着增强脊柱骨锚固定强度的潜力。
