Fig. 5

Post hoc multiple comparisons among 4 Pfirrmann grades. There were significant differences in UTE-T2* values of NP and PAF between each Pfirrmann grades. T2* values were found to be significantly different between Pfirrmann grades II and III in AAF, NP, and PAF. *P values of < 0.05 and **P values of < 0.001 were considered statistically significant. NP, nucleus pulposus; PAF, posterior annulus fibrosus; UTE, ultrashort time-to-echo