Kellgren-Lawrence Grade

Kellgren-Lawrence Grading Scale
Grade 1: doubtful narrowing of joint space and possible osteophytic
lipping
Grade 2: definite osteophytes, definite narrowing of joint space
Grade 3: moderate multiple osteophytes, definite narrowing of joints
space, some sclerosis and possible deformity of bone contour
Grade 4: large osteophytes, marked narrowing of joint space, severe
sclerosis and definite deformity of bone contour