Yongqi L, Dehua Z, Hongzi W, et al. - A modified tracer fixation device was used to investigate the minimal invasiveness, safety, and accuracy of robot-assisted pedicle screw placement procedure. Individuals were allocated randomly to conventional fixation group (25 patients) and modified fixation group (27 patients). There was no baseline statistical difference between the groups. They did not find significant difference between the two groups in terms of the accuracy of pedicle screw placement (P > 0.05). The modified minimally invasive procedure for tracer fixation was found to be a simple, reliable, and highly safe in terms of minimal trauma. Results demonstrate that the method does not compromise the accuracy of pedicle screw placement. Therefore, it has great clinical utility.