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
Classifications in Brief: Kellgren-Lawrence Classification of Osteoarthritis. Kohn MD, Sassoon AA and Fernando ND. Clin Orthop Relat Res. 2016 Aug; 474(8): 1886–1893.