Research Article
Tea Polyphenol Attenuates Oxidative Stress-Induced Degeneration of Intervertebral Discs by Regulating the Keap1/Nrf2/ARE Pathway
| Grade | Pfirrmann system | Structure | Signal | Disc height | Distinction between nucleus and anulus |
| I | Homogeneous | Bright hyperintense white signal intensity | Normal | Clear | II | Inhomogeneous | Hyperintense white signal | Normal | Clear, with or without horizontal gray bands | III | Inhomogeneous | Intermediate gray signal intensity | Normal or slightly decreased | Unclear | IV | Inhomogeneous | Hypointense dark gray signal intensity | Normal or moderately decreased | Lost | V | Inhomogeneous | Hypointense black signal intensity | Collapsed | Lost |
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