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X-ray image distribution by KL grade
| KL grade | KL description | No. of images images |
|---|---|---|
| 0 | No osteophytes, normal joint space | 154 |
| 1 | Doubtful narrowing, possible osteophytes | 102 |
| 2 | Minimal but definite osteophytes, joint space | 39 |
| 3 | Definite and moderate osteophytes, joint space narrow, some subchondral sclerosis | 55 |
