*Compared with T2 values of nucleus pulposus (NP) of grade I, P<0.05; @Compared with T2 values of NP of grade II. P value: compared with each anterior anulus fibrosus (AAF), NP and posterior anulus fi
Histological grading scale based on four categories of degenerative changes. A normal disc is defined as 4 points. A higher score implies more severe degeneration in nucleus pulposus and annulus fibro
