Table 4 Clinical and radiographic outcomes categorized by the Association Research Circulation Osseous (ARCO) stage of avascular necrosis

Hip undergoing surgery (n)

43

33

41

40

28

Hip at the last follow up (n)

34

28

35

36

20

Clinical survival (n)

27

20

18

12

2

Clinical failure

 Modified Harris Hip Score < 75 (n)

2

4

7

8

9

 Secondary surgery (n)

5

4

10

16

9

 Clinical survival rate (%)

79

72

52

32

10

 Radiographic survival (n)

24

20

16

8

2

Radiographic failure

 Additional collapse (n)

5

4

9

12

9

 Secondary surgery (n)

5

4

10

16

9

 Radiographic survival rate (%)

71

72

45

23

10