| 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%) |
|