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Classification for BL after CDR
| Grade | Definition |
|---|---|
| 0 | None. BL accounts for 0–1% of the length of endplate |
| 1 | Mild. BL accounts for 1–5% of the length of endplate |
| 2 | Moderate. BL accounts for 5–10% of the length of endplate |
| 3 | Severe without collapse. BL accounts for > 10% of the length of endplate without prosthesis subsidence |
| 4 | Severe with collapse. BL accounts for > 10% of the length of endplate with prosthesis subsidence |
BL bone loss, CDR cervical disc replacement
