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