Grade | Description |
0 | Definitely solid with bilateral trabeculated stout fusion masses present |
1 | Possibly solid with a unilateral large fusion mass and a contralateral fusion mass |
2 | Possibly solid with a unilateral large fusion mass and a contralateral small fusion mass |
3 | Probably not solid with a small fusion mass bilaterally |
4 | Probably not solid with a small fusion mass not bilaterally |
5 | Definitely not solid with bone graft resorption |
6 | Obvious nonunion bilaterally |