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Table 2 Classification for BL after CDR

From: The impact of smoking on outcomes following anterior cervical fusion-nonfusion hybrid surgery: a retrospective single-center cohort study

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
  1. BL bone loss, CDR cervical disc replacement