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
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