Fig. 4From: The effects of human Wharton’s jelly cell transplantation on the intervertebral disc in a canine disc degeneration modelAnalysis of signal changes in T2-weighted images using the Pfirrmann classification. a Discs showed no degeneration in all groups before the first operation. b There was significantly lower grading of MRI scans in the TS group compared with DS and FS groups at 24 weeks after the first operation (p <0.01)Back to article page