However, sagittal screw angles were at a maximum angle at the upper thoracic spine (T1 and T2) and showed a decreasing trend in the direction of T12.[ 28 ] By this technique, 1.6% of the screws showed superior violation while no screws showed inferior violation; 1.6% screws showed a lateral or medial violation of <2 mm each, while 1.6% showed a lateral violation of 2–4 mm and 0.8% showed a lateral violation of >4 mm.
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