The Kellgren-Lawrence Classification is an X-ray classification scheme for osteoarthritis of the knee.
Kellgren-Lawrence classification of OA
The classification is as follows:
- Grade 1 - doubtful narrowing of the joint space with possible osteophyte formation
- Grade 2 - possible narrowing of the joint space with definite osteophyte formation
- Grade 3 - definite narrowing of joint space, moderate osteophyte formation, some sclerosis, and possible deformity of bony ends
- Grade 4 - large osteophyte formation, severe narrowing of the joint space with marked sclerosis, and definite deformity of bone ends
Reference
Kellgren JH, Lawrence JS. Radiological assessment of osteo-arthrosis. Ann Rheum Dis. 1957;16(4):494–502.
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