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Table 1 Kellgren and Lawrence classification system[40]

From: Efficacy of strength and aerobic exercise on patient-reported outcomes and structural changes in patients with knee osteoarthritis: study protocol for a randomized controlled trial

Grade Description
0 No changes
1 Doubtful narrowing of joint space and possible osteophytic lipping
2 Definite osteophytes and possible narrowing of joint space
3 Moderate multiple osteophytes, definite narrowing of joint space, and some sclerosis, and possible deformity of bone ends
4 Large osteophytes, marked narrowing of joint space, severe sclerosis and definite deformity of bone ends