Table 3. Facet joint violation grading scale.
| Grade 0 | Screw not in facet |
|---|---|
| Grade 1 | Screw in lateral facet but not in facet articulation |
| Grade 2 | Penetration of facet articulation by screw |
| Grade 3 | Screw travels within facet articulation |
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.