Fig. 7From: Induction of cervical disc degeneration and discogenic pain by low concentration Propionibacterium acnes infection: an in vivo animal studyA The cell death in the central region of the intervertebral disc was complete in the P. acnes-H and S. aureus groups and was more severe in the S. aureus group. B At 6 weeks postoperatively, there was no obvious degeneration of the disc and endplate in the control group. C–E The histologic scores for each group at 2 and 6 weeks postoperatively Back to article page