| Popis: |
Several techniques are known for treatment of an atlanto-axial instability. Posterior transarticular screw fixation first published by Grob and Magerl (1987) is the most rigid way to achieve this aim. The C1–C2 joint functions primarily in rotation and secondarily in flexion and extension. Therefore, in stabilization of this segment, it is mandatory that flexion-extension, lateral bending, and axial rotation are restricted. The direction of the screws in the transarticular screw technique reduces motion in all degrees of freedom, which results directly in high segmental stability. Additionally, this technique prevents a slippage of the segment. However, only the interlaminar bone graft between C1 and C2 will achieve the final stability through bony fusion. |
