Table 4.
Comparison of MRI parameters between the hips with and without residual dysplasia.
| Groups | Residual dysplasia (n = 13 hips) |
No residual dysplasia (n = 15 hips) |
p | ||
|---|---|---|---|---|---|
| Post-reduction MRI | Mean | ±SD (95% CI) | Mean | ±SD (95% CI) | |
| Acetabular version (°) | 25 | ±6 (22 to 29) | 20 | ±5 (17 to 22) | 0.03 |
| Femoroacetabular distance axial (mm) | 6 | ±1 (5 to 7) | 4 | ±2 (3 to 5) | 0.01 |
| Femoroacetabular distance coronal (mm) | 7 | ±1 (6 to 7) | 5 | ±1 (4 to 5) | 0.006 |
| Acetabular depth–width ratio (%) | 19 | ±6 (15 to 23) | 20 | ±4 (18 to 22) | 0.38 |
| Osseous acetabular index (°) | 39 | ±7 (35 to 43) | 31 | ±7 (27 to 35) | 0.02 |
| Cartilaginous acetabular index (°) | 17 | ±6 (13 to 21) | 14 | ±5 (11 to 17) | 0.17 |
| Limbus thickness (mm) | 6 | ±1 (5 to 7) | 4 | ±1 (3 to 4) | 0.02 |
| Medial cartilage thickness (mm) | 3 | ±1 (2 to 3) | 2 | ±1 (1 to 2) | 0.01 |
| Last radiographic follow-up | Mean | ±SD | Mean | ±SD (95% CI) | p |
| Duration of follow-up (years) | 14 | ±3 (12 to 16) | 13 | ±3 (11 to 14) | 0.16 |
| Lateral center edge angle (°) | 23 | ±11 (17 to 29) | 30 | ±6 (26 to 33) | 0.06 |
| Acetabular index (°) | 13 | ±10 (7 to 19) | 10 | ±6 (6 to 13) | 0.26 |
| Breach in Shenton’s line (hips, %) | 3 | 23% (0% to 46%) | 1 | 7% (–6% to 20%) | 0.24 |
| Severin grade > 2 (hips, %) | 7 | 54% (27% to 81%) | 0 | 0% | <0.001 |
MRI: magnetic resonance imaging; SD: standard deviation; CI: confidence interval.