Table 1.

Kellgren-Lawrence Classification.⁷.

Grade	Radiographic findings
0	Normal
1	Doubtful narrowing of joint space, possible osteophytic lipping
2	Possible narrowing of joint space, definite osteophytes
3	Definite narrowing of joint space, moderate multiple osteophytes, some subchondral sclerosis, possible deformity of bone ends
4	Marked narrowing of joint space, large osteophytes, severe subchondral sclerosis, definite deformity of bone ends