Fig. 5From: Differences in calcification and osteogenic potential of herniated discs according to the severity of degeneration based on Pfirrmann grade: a cross-sectional studyGreater expression of BMP-2 (P < 0.01), Osterix (P < 0.05), and Osteocalcin, (P < 0.01) was observed in Pfirrmann grade V discs compared to grade III discs. *P < 0.05, **P < 0.01Back to article page