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Table 1 Brantigan grade distribution determined radiographically at different time points

From: Imaging evaluation of nano-hydroxyapatite/polyamide 66 strut in cervical construction after 1-level corpectomy: a retrospective study of 520 patients

  3 months post-op 6 months post-op 12 months post-op Final FU
Grade 1     
Grade 2 60% 10%   
Grade 3 40% 20% 3% 1%
Grade 4   50% 80% 10%
Grade 5    10% 87%