Fig. 2From: Differences in calcification and osteogenic potential of herniated discs according to the severity of degeneration based on Pfirrmann grade: a cross-sectional studyHE staining in (a) revealed mineralization (*) and cells surrounding the mineralization spot (arrow) in degenerated discs. Von Kossa staining in (b) verified the mineralization (*) in discs. a and b are Pfirrmann grade IV discsBack to article page