Table 1 Frequency (n) of structural abnormalities on adjudicated reading of baseline fixed flexion radiographs

Medial joint space narrowing

70

46

35

5

Lateral joint space narrowing

130

14

10

2

Medial tibia osteophyte

51

73

23

9

Medial femoral osteophyte

77

20

20

39

Medial subchondral tibial sclerosis

103

32

17

4

Medial subchondral femoral sclerosis

100

35

16

5

Medial tibial cysts

142

14

-

-

Medial femoral cysts

155

1

-

-

Medial chondrocalcinosis

139

17

-

-

Medial tibial bone attrition

154

2

-

-