Table 18.13-1. Kellgren-Lawrence scale for radiographic classification of osteoarthritis



0: Normal


1: Questionable

Doubtful narrowing of joint space and possible osteophytic lipping

2: Mild

Definite osteophytes and possible narrowing of joint space

3: Moderate

Moderate multiple osteophytes, definite narrowing of joint space, some sclerosis, and possible deformity of bone ends

4: Severe

Large osteophytes, marked narrowing of joint space, severe sclerosis, and definite deformity of bone ends

Based on Ann Rheum Dis. 1957;16(4):494-502.