(4) putamen bursa reachs nerve root press press or shift: The adipose layer between interverbebral disc and putamen bursa disappears, putamen bursa press press squashs, nerve root disappears or shift.

• (4)硬膜囊及神经根受压或移位：椎间盘与硬膜囊之间的脂肪层消失，硬膜囊受压变扁，神经根消失或移位。