Table 1.
Grade | Definition |
---|---|
0 | Normal |
1 | No definite osteophyte (may have other limited cartilage/bone/periarticular changes but no joint space narrowing) |
2 | Definite osteophyte. Focal cartilage loss without extensive involvement (i.e., no joint space narrowing) |
3 | Osteophyte plus significant cartilage loss involving at least one facet and/or trochlear surface (i.e., some joint space narrowing) |
4 | Osteophyte plus complete cartilage loss involving >50% of medial and/or lateral patellofemoral compartment (i.e., at least one surface of bone-on- bone joint space narrowing) |