Table 3 Demographic, clinical and radiographic characteristics of AVN after PFNF
Total | Non-collapsed stage | Collapsed stage | p value | |
|---|---|---|---|---|
Demographic parameters | ||||
Age (mean ± SD, years) | 13.6 ± 2.0 | 13.6 ± 2.1 | 13.5 ± 1.2 | 0.89* |
Sex (n, %) | 0.72** | |||
Male | 78 (67.8) | 28 (70.0) | 50 (66.7) | |
Female | 37 (32.2) | 12 (30.0) | 25 (33.3) | |
Side (n, %) | < 0.01** | |||
Left | 51 (44.3) | 11 (27.5) | 40 (53.3) | |
Right | 64 (55.7) | 29 (72.5) | 35 (46.7) | |
Clinical characteristics | ||||
Interval between fracture and AVN diagnosis (mean ± SD, months) | 13.7 ± 9.5 | 15.1 ± 9.8 | 11.2 ± 8.5 | 0.04* |
Symptomatic (n, %) | ||||
Yes | 68 (59.1) | 10 (25.0) | 58 (77.3) | < 0.01** |
No | 47 (40.9) | 30 (75.0) | 17 (22.7) | |
Hip pain (n, %) | < 0.01** | |||
Yes | 63 (54.8) | 10 (25.0) | 53 (70.7) | |
No | 52 (45.2) | 30 (75.0) | 22 (29.3) | |
Limp (n, %) | < 0.01** | |||
Yes | 58 (50.4) | 6 (15.0) | 52 (69.3) | |
No | 57 (49.6) | 34 (85.0) | 23 (30.7) | |
Restricted hip function | < 0.01*** | |||
Yes | 34 (29.6) | 1 (2.5) | 33 (56.0) | |
No | 81 (70.4) | 39 (97.5) | 42 (44.0) | |
Radiographic characteristics | ||||
Ratliff classification of AVN (n, %) | < 0.01**** | |||
Type I | 50 (43.5) | 7 (17.5) | 43 (43.5) | |
Type II | 61 (53.0) | 29 (72.5) | 32 (53.0) | |
Type III | 4 (3.5) | 4 (10.0) | 0 (0) | |
JIC classification of AVN (n, %) | < 0.01**** | |||
A/B | 13 (11.3) | 12 (30.0) | 1 (1.3) | |
C1 | 40 (34.8) | 17 (42.5) | 23 (30.7) | |
C2 | 62 (53.9) | 11 (27.5) | 51 (68.0) | |
ARCO stage (n, %) | ||||
II | 40 (34.8) | |||
IIIA | 34 (29.6) | |||
IIIB | 16 (13.9) | |||
IIIC | 25 (21.7) | |||