An Automatic Knee Osteoarthritis Diagnosis Method Based on Deep Learning: Data from the Osteoarthritis Initiative

Table 1

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