Kellgren-Lawrence Classification

Kellgren, Lawrence. Radiological Assessment of Osteoarthritis. Ann Rheum Dis. 1957;16:494-502

Grade 0 - No presence of OA
Grade 1 - Doubtful narrowing, possible osteophytes
Grade 2 - Possible narrowing, definite osteophytes
Grade 3 - Definite narrowing, moderate osteophytes, some sclerosis and possible deformity
Grade 4 - severe narrowing, large osteophytes, marked sclerosis, definite deformity

X-rays finding of OA
narrowing of joint space
osteophytes
sclerosis of subchondral bone
pseudocystic changes
altered shape

Interesting short biography on Dr. Kellgren:
https://academic.oup.com/rheumatology/article/42/5/708/1784848

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