Answer to the letter to the editor of Hong-Bin Guo et al. entitled 'Anterior versus posterior approach for treatment of thoracolumbar burst fractures: a meta-analysis' by Gui Jun Xu, Zhi Jun Li, Jian Xiong Ma, Tao Zhang, Xin Fu, Xin Long Ma (2013); Eur Spine J (2013) 22:2176-2183.

摘要

For the IPS, we found a correlation between compression stiffness and stabilization in extension. Here, the system with the lowest stiffness, DIA, displayed nearly no stabilization of the treated segment, whereas the system with the highest stiffness, WAL and COF, was most pronounced. This applies also for the correlation between device stiffness and IDP. In flexion only the degree of stabilization is in correlation with the tensile stiffness, whereas the IDP stays constant and is not affected by the different tensile stiffness. IPS is not able to stabilize in the frontal and transversal plane. Furthermore IPS does not substantially alter the location of the COR.