Table 3.
Results of the 11 evaluated radiographic parameters for the four study groups
| Parameter | Dysplasia | Control | Overcoverage | Severe overcoverage | p value |
|---|---|---|---|---|---|
| LCEA (degrees) | 16 ± 7 (−1 to 20) | 26 ± 5 (20–35) | 35 ± 6 (24–46) | 49 ± 6 (31–59) | < 0.001 |
| MCEA (degrees) | 48 ± 9 (36–63) | 41 ± 6 (27–52) | 31 ± 5 (24–43) | 27 ±7 (12–40) | < 0.001 |
| Acetabular arc (degrees) | 59 ± 7 (46–77) | 67 ± 6 (51–77) | 66 ± 7 (57–85) | 75 ± 9 (60–93) | < 0.001 |
| Extrusion index (degrees) | 33 ± 6 (26–54) | 23 ± 5 (12–31) | 15 ± 5 (5–25) | 7 ± 4 (0–18) | < 0.001 |
| Acetabular index (degrees) | 13 ± 8 (7–32) | 9 ± 4 (4–19) | 0 ± 4 (−7 to 7) | −10 ± 6 (−17 to 7) | < 0.001 |
| Sharp angle (degrees) | 46 ± 3 (39–52) | 40 ± 2 (34–45) | 38 ± 4 (32–45) | 34 ± 4 (25–44) | < 0.001 |
| Crossover sign (percent positive) | 19 | 10 | 14 | 8 | 0.635 |
| Posterior wall sign (percent positive) | 100 | 71 | 57 | 4 | < 0.001 |
| Anterior coverage (percent) | 12 ± 5 (4–22) | 19 ± 6 (7–29) | 29 ± 9 (13–42) | 42 ± 8 (25–54) | < 0.001 |
| Posterior coverage (percent) | 37 ± 8 (15–47) | 43 ± 7 (32–59) | 49 ± 9 (32–64) | 66 ± 7 (55–81) | < 0.001 |
| Craniocaudal coverage (percent) | 63 ± 8 (42–76) | 78 ± 7 (68–92) | 85 ± 7 (72–95) | 95 ± 5 (85–100) | < 0.001 |
Continuous data are expressed as mean ± SD and range in parentheses; LCEA = lateral center-edge angle; MCEA = medial center-edge angle.