Boustani H N, Rohlmann A, Abouezzeddine O, Bergmann G, Zander T
Julius-Wolff-Institut, Charité-Universitätsmedizin Berlin, Augustenburger Platz 1, 13353, Berlin, Deutschland.
Orthopade. 2011 Feb;40(2):162-8. doi: 10.1007/s00132-010-1716-z.
The novel transsacral fusion system AxiALIF allows stabilization of the lumbosacral junction. The system consists of a screw with two different diameters. With additional facet screws or internal fixation devices 360° fusion can be achieved. The effects of different parameters such as length, diameter combination and material of the transsacral screw, type of additional fixation and stiffness of the bone are unknown. In a probabilistic finite element analysis, the input parameters were randomly varied. The rotational angles and the axial forces in the various implants were calculated for four different load scenarios. In a subsequent sensitivity study the influences of single input parameters on the variance of the results were calculated. A transsacral screw significantly reduces the motion in the treated segment, except for axial rotation. An additional fixation has a strong effect on the variance of rotation angles. The other parameters usually explain less than 10% of the variance. The novel lumbosacral fusion system allows good stabilization of the segment, especially when additional fixation via facet screws or fixators is performed.
新型经骶骨融合系统AxiALIF可实现腰骶关节的稳定。该系统由两种不同直径的螺钉组成。通过额外的关节突螺钉或内固定装置可实现360°融合。经骶骨螺钉的长度、直径组合和材料、额外固定类型以及骨质硬度等不同参数的影响尚不清楚。在概率有限元分析中，输入参数随机变化。针对四种不同的载荷情况计算了各种植入物中的旋转角度和轴向力。在随后的敏感性研究中，计算了单个输入参数对结果方差的影响。经骶骨螺钉可显著减少治疗节段的运动，但轴向旋转除外。额外固定对旋转角度的方差有很大影响。其他参数通常解释的方差不到10%。新型腰骶融合系统可实现节段的良好稳定，尤其是在通过关节突螺钉或固定器进行额外固定时。
