Table 5: Comparative scheme between the different spinal navigation systems.

Method	Navigation by TC	Fluoro iso-C 3D	Fluoro 2D-TC
Image	3D high quality bone anatomy.	3D, limited to a volume of 120 mm3, limited to obese.	2D, limited to obese.
Preoperative	Required CT High-resolution reconstruction.	Does not require preoperative images.	Does not require preoperative images.
Intraoperative	Manual registration. It does not correct errors.	Automatic registration, correct errors.	Multiple images, automatic registration, long surgical time.
Postoperative	CT may be necessary.	Not necessary CT.	CT may be necessary.

In this scheme we observe the different navigation systems for the fixation of the column according to the method and obtaining radiological images with fluoro 2D-CT, fluoro iso C-3D, and navigation by, being the differences in accuracy between them insignificant.