Table 3 Bone marrow edema and fat metaplasia in the cartilaginous versus ligamentous sacroiliac joint compartment (mean percentage of subjects over five readers)

Number of subjects

20

10

39

20

31

24

33

BME cart+/lig+

42.0

80.0

2.1

4.0

11.6

37.5

2.4

BME cart+/lig–

41.0

8.0

25.6

30.0

33.5

36.7

25.5

BME cart–/lig+

0

0

1.5^a

2.0^a

0

0.8^a

0

BME cart–/lig–

17.0

12.0

70.8

64.0

54.8

25.0

72.1

Fat cart+/lig+

21.0

42.0

17.4

12.0

25.2

41.7

8.5

Fat cart+/lig–

26.0

24.0

11.8

6.0

18.7

37.5

13.9

Fat cart–/lig+

0

4.0^b

0.5^b

0

0

0.8^b

0.6^b

Fat cart–/lig–

53.0

30.0

70.3

82.0

56.1

20.0

77.0