Spinal cord fills about 50% of the canal in the thoracolumbar segments. The remainder of the canal is filled with Cerebrospinal fluid, epidural fat and meninges. The spatial relationships of grey and white matter structures remain consistent throughout the length of the cord, but the proportions change based on the level. All the patients had routine X-rays of thoracolumbarspine in both Anteroposterior and Lateral views.In all the patients MRI spine and 3D CT ofspine with 2mm thick film uploaded in navigation machine which gives 3D image of the vertebrae. After registration in navigation machine, the pedicle screw trajectory, size and length planned and placed in the center of the pedicle.In our study we had 69.23% males and 30.77% female patients in conventional method and had 84.61% males and 15.39% female patients in navigation method. The average age was 36 years and 29 year in conventional method and navigation method respectively, with male predominance in each group.