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Table 1 Kellgren-Lawrence Grading (KLG) Scale

From: Radiographic and clinical evidence: osteoarthritic knee can change surgical result for lumbar degenerative disease patient undergone surgery for 3-year follow-up: a retrospective comparative clinical study

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