Radiological interpretation of joint space narrowing & Kellgren-Lawrence (K-L) scale

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Grade 0 = Normal

Grade 1 = Doubtful narrowing of the joint space & possible osteophytic lipping

Grade 2 = Definite Osteophytes & definite narrowing of joint space

Grade 3 = Moderate multiple Osteophytes, definite narrowing of joint space, some sclerosis & possible deformity of bone contour

Grade 4 = Large Osteophytes, marked narrowing of joint space, severe sclerosis & definite deformity of bone contour

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