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Definition of the Kellgren–Lawrence grading system.
| Grade | Remarks |
|
| |
| KL-0 | No evidence of osteophyte |
| KL-1 | Doubtful osteophyte |
| KL-2 | Definite osteophyte; possible joint space narrow (JSN) |
| KL-3 | Moderate osteophytes, definite JSN, some sclerosis, and possible deformity of bone ends |
| KL-4 | Large osteophytes, definite JSN, sclerosis, and deformity of bone ends |
