Table 4.
Severity of dysplasia and head-neck offset characteristics
| Variables | Mild (LCEA 15°-20°) (n = 28) | Moderate/severe (LCEA < 15°) (n = 22) | p value |
|---|---|---|---|
| Alpha angle* (degrees; mean ± SD) | |||
| 9:00 | 36 ± 4 | 36 ± 3 | 0.97 |
| 10:30 | 35 ± 3 | 35 ± 4 | 0.77 |
| 12:00 | 40 ± 3 | 39 ± 3 | 0.25 |
| 1:30 | 49 ± 6 | 50 ± 6 | 0.79 |
| 3:00 | 43 ± 6 | 46 ± 8 | 0.14 |
| Maximum alpha angle* (degrees; mean ± SD) | 52 ± 7 | 54 ± 6 | 0.28 |
| Maximum alpha angle location* (o’clock; mean ± SD) | 1:45 ± 30 minutes | 2:15 ± 60 minutes | 0.18 |
| Femoral head-neck offset* (mm; mean ± SD) | |||
| 12:00 | 9 ± 1 | 10 ± 1 | 0.04 |
| 1:30 | 6 ± 1 | 7 ± 1 | 0.37 |
| 3:00 | 8 ± 2 | 8 ± 2 | 0.64 |
| Femoral head-neck offset ratio (mean ± SD) | |||
| 12:00 | 0.20 ± 0.03 | 0.22 ± 0.03 | 0.01 |
| 1:30 | 0.14 ± 0.03 | 0.15 ± 0.03 | 0.31 |
| 3:00 | 0.17 ± 0.04 | 0.17 ± 0.03 | 0.75 |
| Minimum head-neck offset ratio (mean ± SD) | 0.13 ± 0.03 | 0.14 ± 0.03 | 0.27 |
*Alpha angle, head-neck offset, and head-neck offset ratio measured according to the clockface position; 3:00 position is anterior; LCEA = lateral center-edge angle.