New revolutionary techniques as the tridimensional navigation and the per-operatory tomodensitometry appeared in the last few years. The techniques give the best results when used concommitantly. The material has the advantage of being very precise. The pedicular screw malposition rate is minimal after a three-dimensional localisation. However, those systems require qualified staff and expose the patient and the nursing team to high radiation levels. The costs are higher and the surgery duration is globally longer. It is thus difficult to implement this technique in each belgian hospital.