OBJECTIVE: To evaluate the position of anatomical structures at risk during insertion of pedicle screws in the thoracic spine and its relation to the variation of Cobb angle. METHODS: The parameters studied were: the degree of Cobb angle on radiographs and the position of the spinal cord, the pleural cavity and aorta on MRI in relation to a line of 40mm created to simulate the pedicle screw in the five apical vertebrae. RESULTS: The distance from the aorta to the vertebral body and the angle of security of the convex side showed statistical difference when related to variation of Cobb angle measured. CONCLUSION: The results suggest a greater risk of injury to the aorta with increasing Cobb angle and increased risk in the insertion of pedicle screws on the convex side of curvature when considering the safety angle.
Spine; Scoliosis; Magnetic resonance imaging; Radiography; Spinal cord
