THE KELLGREN AND LAWRENCE SYSTEM: CLASSIFICATION FROM 0-4 Flashcards
is a method of classifying the severity of knee osteoarthritis (OA) using five grades. This classification was proposed by Kellgren et al. in 1957 2 and later accepted by WHO in 1961.
1
Q
no radiographic features of OA are present
A
grade 0
2
Q
doubtful joint space narrowing (JSN) and possible osteophytic lipping
A
grade 1
3
Q
definite osteophytes and possible JSN on anteroposterior weight-bearing radiograph
A
grade 2
4
Q
multiple osteophytes, definite JSN, sclerosis, possible bony deformity
A
grade 3
5
Q
large osteophytes, marked JSN, severe sclerosis and definite bony deformity
A
grade 4
