Table 3.
Radiographic parameter threshold values associated with indication for combined surgical dislocation and PAO
| Parameter | Number of hips | p value | |
|---|---|---|---|
| Group I (no PAO) (n = 52) | Group II (PAO) (n = 45) | ||
| Crossover sign | 32 (61.5%) | 17 (37.8%) | 0.02 |
| Stulberg class | |||
| II | 11 (21.2%) | 14 (31.1%) | |
| III | 14 (26.9%) | 20 (44.4%) | |
| IV–V | 27 (51.9%) | 11 (24.4%) | 0.006 |
| IV | 21 (40.4%) | 8 (17.6%) | |
| V | 6 (11.5%) | 3 (6.7%) | 0.5 |
| Tönnis OA grade | |||
| 0 | 7 (13.5%) | 10 (22.2%) | |
| 1 | 24 (46.2%) | 26 (57.8%) | |
| ≥ 2 | 21 (40.4%) | 9 (20.0%) | 0.03 |
| LCEA < 20° | 22 (42.3%) | 37 (82.2%) | < 0.001 |
| ACEA < 20° | 20 (44.4%) | 29 (78.4%) | 0.002 |
| AI > 10° | 30 (57.7%) | 42 (93.3%) | < 0.001 |
| CTD | |||
| > −1.2 cm | 17 (32.7%) | 10 (22.2%) | |
| −1.7 to −1.2 cm | 9 (17.3%) | 6 (13.3%) | |
| < −1.7 cm | 26 (50.0%) | 29 (64.4%) | 0.152 |
| AHI < 0.8 | 32 (61.5%) | 37 (82.2%) | 0.025 |
PAO = periacetabular osteotomy; OA = osteoarthritis; LCEA = lateral center-edge angle; ACEA = anterior center-edge angle; AI = acetabular inclination; CTD = center-trochanteric distance; AHI = acetabulum-head index.