Table 2.
Radiographic characteristics of the two study groups
| Parameter | Nonoperative group | Operative group | p value | ||
|---|---|---|---|---|---|
| Baseline | Baseline | Postoperative | Baseline versus baseline | Baseline versus postoperative | |
| Number of hips (patients) | 20 (20) | 20 (19) | 20 (19) | – | – |
| Alpha angle (°) | 65 ± 10 (46–91) | 73 ± 12 (55–91) | 53 ± 6 (42–63) | 0.022 | < 0.001 |
| Femoral torsion (°) | 14 ± 10 (−13 to 29) | 15 ± 8 (−6 to 28) | 14 ± 6 (−3 to 28) | 0.986 | 0.914 |
| Lateral center-edge angle (°) | 32 ± 8 (17–48) | 32 ± 9 (25–63) | 29 ± 7 (22–47) | 0.967 | 0.002 |
| Extrusion index (°) | 20 ± 8 (3–36) | 20 ± 6 (1–27) | 22 ± 7 (1–29) | 0.926 | < 0.001 |
| Acetabular index (°) | 1 ± 8 (−11 to 19) | 1 ± 5 (−9 to 11) | 2 ± 5 (−9 to 9) | 0.975 | 0.687 |
| Number of hips with protrusio (%) | 0 | 1 (5) | 1 (5) | 0.305 | 1 |
| Number of hips with positive crossover sign (%) | 14 (70) | 13 (65) | 10 (50) | 0.639 | 0.18 |
| Number of hips with positive posterior wall sign (%) | 14 (70) | 15 (75) | 15 (75) | 0.605 | 1 |
| Number of hips with positive ischial spine sign (%) | 7 (35) | 7 (35) | 7 (35) | 1 | 1 |
| Retroversion index (%) | 25 ± 10 (10–47) | 19 ± 11 (6–37) | 18 ± 12 (2–36) | 0.122 | 0.438 |
| Neck-shaft angle (°) | 132 ± 7 (122–151) | 131 ± 5 (123–144) | 130 ± 6 (121–141) | 0.478 | 0.343 |
Values are mean ± SD with ranges in parentheses.