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

Joint Cartilage & Osteoarthritis

Papers about joint cartilage problems in the knee, delivered at a very basic level.



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.

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