Native radiological classification of osteoarthritis according to the Kellgren and Lawrence score.
| Osteophytes (new bone formations) | Joint space | Sclerosis | Deformation | Points |
| none or questionable | none or questionable narrowed | none | none | 0 |
| unique | unique | light | light | 1 |
| large | advanced | light with cysts | distinctly | 2 |
| cancelled | strong with cyst formation | 3 |
Interpretation
According to the Kellgren-Lawrence score, the radiological expression of osteoarthritis is divided into five grades:
| Grade | Points | Interpretation |
| 0 | 0 | |
| 1 | 1-2 | Minor subchondral sclerosis (compaction of bone tissue beneath the cartilage layer of a joint). No joint space narrowing or osteophytes (circumscribed bone neoplasms). |
| 2 | 3-4 | Minor joint space narrowing and incipient osteophyte formation, indicated joint surface irregularities |
| 3 | 5-9 | Pronounced osteophyte formation, marked irregularities of articular surface |
| 4 | 10 | Marked joint space narrowing to complete destruction (destruction), deformity/necrosis (tissue death) of joint partners |
Classification of osteoarthritis according to Noyes/Stabler.
| Stage | Macroscopic-arthroscopic pathologies |
| 1 | |
| 2 |
|
| 3 |
|
