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Table 5 The Kellgren-Lawrence classification for osteoarthritis

From: The effect on knee-joint load of instruction in analgesic use compared with neuromuscular exercise in patients with knee osteoarthritis: study protocol for a randomized, single-blind, controlled trial (the EXERPHARMA trial)

Grade of osteoarthritis Description
0 No osteoarthritis
1 Doubtful narrowing of joint space and/or possible osteophytes
2 Definite osteophytes and possible narrowing of joint space
3 Multiple osteophytes, definite narrowing of joint space, and some sclerosis and deformity of bone ends
4 Large osteophytes, marked narrowing of joint space, severe sclerosis, and definite deformity of bone ends