Krödel A, Weindl B, Lehner W
Orthopädische klinik und Poliklinik, Klinikum Grosshadern, Ludwig-Maximilians-Universität München.
Z Orthop Ihre Grenzgeb. 1994 Jan-Feb;132(1):67-74. doi: 10.1055/s-2008-1039822.
Pseudarthrosis is said to be a main complication in anterior interbody fusion. It is usually the result of an insufficient mechanical stability which hinders bony incorporation of intervertebral bone grafts. In order to improve stability dorsal transpedicular instrumentation should be carried out to achieve interfragmentary compression between bone block and adjacent vertebral endplate. Using human lumbar spine cadavers and a capacitive measuring mat an experimental study was completed to find out in which way an internal fixator has to be used to achieve this goal. The collected data showed that simple compression of the fixator by reducing the distance between the Schanz-screws did not produce sufficient interfragmentary compression. Preloading the fixator in kyphosis and compression in a second step improved the results significantly. Using this technique a compressive interbody fusion can be attained.
假关节形成被认为是前路椎间融合术的主要并发症。它通常是机械稳定性不足的结果，这会阻碍椎间骨移植物的骨融合。为了提高稳定性，应进行后路经椎弓根内固定，以实现骨块与相邻椎体终板之间的骨折块间加压。利用人体腰椎尸体和电容式测量垫完成了一项实验研究，以找出必须以何种方式使用内固定器来实现这一目标。收集的数据表明，通过缩短斯氏针之间的距离对固定器进行简单加压并不能产生足够的骨折块间加压。先在脊柱后凸状态下对固定器进行预加载，然后在第二步进行加压，可显著改善结果。采用这种技术可以实现椎间融合加压。
