"The Pfirrmann grading system is the most widely known classification for intervertebral disc degeneration and is used in both clinical and research contexts 2,3. The intra- and inter-observer agreement of the Pfirrmann grading system is excellent 3."
"Modified Pfirrman grading system"
"Tufts Classification"
"In 2015 Riesenburger et al proposed a new classification system to include annular high signal intensity zone and Modic changes 6. This has yet to be widely adopted and may have reduced interoberserver reliability 7."
Expected headings
"Limitations and alternative systems"
"Limitations"
"Modified Pfirrman grading system"
"Tufts Classification"
"some discs can have narrowed disc height but remain normal in signal (e.g. L5/S1)"