Objective: pedicular screw technique has becoming the standard choice for spinal fixation. The goal of the study is to evaluate thoracic and lumbar pedicle screws placement to treat a variety of spinal disorders. These screws were inserted using intrapperative anatomical and fluoroscopic parameters. Methods: the retrospective analysis included 24 patients (7 men and 17 women with a mean age of 34.6 years), the radiograms and the computed tomograms. They were operated due some spinal disease using pedicle screws from T2 to S1 totalizing 183 pedicular screws. The screw insertion technique is based on the intraoperative anatomic and fluoroscopic parameters. The exams were analyzed by three orthopaedic spinal surgeons and one radiologist looking for any cortical violation. When they found any cortical violation until 2mm the screw position was considered acceptable. Results: pedicle screws perforations were seen in 36.06% but only 3.82 % were classified as not acceptable. It was observed 96.18% of screws without or with minimal violation which does not cause any risk of visceral, nervous or vascular lesion. In the violated pedicles. It was seen 63.64% of lateral, 19.69% of medial and 16,66% of anterior perforation. There were no superior or inferior violations. 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