Fig. 3From: Increased lactic acid content associated with extracellular matrix depletion in a porcine disc degeneration induced by superficial annular lesionDegeneration of the nucleus pulposus (NP) and annulus fibrosus (AF) tissue cells was found in AL group. a HE and Masson and Safarnin O and fast green staining showed severe damage of the NP of L2–3 intervertebral disc at 4, 8 and 12 weeks after lesion, NP tissue was replaced by hyperplastic connective tissue. b AF was rupture and disorder in annular lesion group compared with sham groupBack to article page