No. hip AVN

Classification according to Kalamchi

I

II

III

IV

Primery operation (n = 139)

45 (32.4%)

4

31

10

0

Femoral shortening (n = 42)

16 (38.1%)

1

12

3

61 (33.7%)

5 (8.3%)

42 (70.0%)

13 (21.7%)