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Kellgren-Lawrence Grading System of osteoarthritis
| Grade | Description |
|---|---|
| 0 | No radiographic signs of OA |
| 1 | Doubtful JSN + possible osteophytic lipping |
| 2 | Definite osteophytes + possible JSN |
| 3 | Multiple osteophytes + possible deformity + sclerosis + definite JSN |
| 4 | Marked osteophytes and JSN + severe sclerosis + marked deformity |
JSN=Joint space narrowing, OA=Osteoarthritis
