Research Article
Correlation Analysis between Tamoxifen and Lumbar Intervertebral Disc Degeneration: A Retrospective Case-Control Study
Table 1
Modified Pfirrmann grading system.
| ā | Strength of nucleus pulposus and inner annulus fibrosus | Signal difference between the inner and outer sides of the posterior annulus fibrosus | Intervertebral disc height |
| Grade 1 | Homogeneous high signal, equivalent to cerebrospinal fluid (CSF) | Obvious | Normal | Grade 2 | High signal, lower than CSF, higher than presacral fat | Obvious | Normal | Grade 3 | High signal, lower than presacral fat | Obvious | Normal | Grade 4 | Moderate signal, higher than the outer annulus fibrosus | Not obvious | Normal | Grade 5 | Low signal, equivalent to low outer annulus fibrosus | Not obvious | Normal | Grade 6 | Low signal | Not obvious | Reduced less than 30% | Grade 7 | Low signal | Not obvious | Reduced 30%ā60% | Grade 8 | Low signal | Not obvious | Reduced more than 60% |
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