Grade 0(normal): No compromise of the root is seen. Grade 1(contact): there is visible contact of disc material with the nerve root, and the normal epidural fat layer between the two is not evident. The nerve root has a normal position, and there is no dorsal deviation. Grade 2(deviation): The nerve root is displaced dorsally by disc material. Grade 3(compression): The nerve root is compressed between disc material and the wall of the spinal canal; it may appear flattened or be indistinguishable from disc material广州市番禺区中医院介入科许国增

翻译：0级（神经根没有受压）

            1级（突出物与神经根之间脂肪间隙消失）

            2级（神经根受压移位）

            3级（突出物完全湮没神经根）