Table 2.
Parameters of proximal femoral anatomy for DDH and control groups
| DDH (n = 51) | p | Normal (n = 30) | ||
|---|---|---|---|---|
| IVa (n = 25, without false acetabulum) |
IVb (n = 26, with false acetabulum) |
|||
| Height of the dislocation (mm) | 65.34 ± 9.83 (46.79–81.35) | 52.24 ± 11.42 (39.18–76.91) | 0.000** | / |
| Dislocation rate (%) | 31.88 ± 4.10 (24.52–38.62) | 24.99 ± 4.81 (20.08–36.30) | 0.000** | / |
| Height of the FH (mm) | 38.99 ± 7.81 (23.12–53.19)## | 37.35 ± 6.48 (19.80–47.41)## | 0.395 | 45.55 ± 6.25 (34.53–64.37) |
| Height of the GT (mm) | 54.72 ± 4.90 (46.27–64.24) | 51.87 ± 4.72 (44.57–61.91)## | 0.052 | 55.88 ± 5.71 (47.08–71.13) |
| GT–FH height discrepancy (mm) | 15.73 ± 5.13 (6.90–29.69)## | 14.52 ± 5.42 (1.92–27.65)## | 0.356 | 10.34 ± 3.37 (4.25–16.81) |
| Height of the isthmus (mm) | 68.16 ± 26.87 (25.18–128.02)## | 87.93 ± 23.71 (35.63–125.23)## | 0.023* | 114.10 ± 15.82 (82.28–147.91) |
| Femoral offset (mm) | 31.41 ± 7.27 (16.51–46.80)## | 33.90 ± 3.72 (27.02–42.29)## | 0.345 | 41.38 ± 3.28 (34.78–49.40) |
| Neck-shaft angle (°) | 114.64 ± 7.58 (97.79–127.65)## | 126.51 ± 7.58 (113.62–143.87) | 0.000** | 125.44 ± 4.72 (117.99–136.16) |
| Femoral neck anteversion (°) | 41.35 ± 14.55 (3.26–65.19)## | 25.94 ± 11.06 (4.13–51.63)## | 0.000** | 14.96 ± 9.03 (2.40–35.84) |
Values are presented as the mean and the standard deviation, with range in parentheses; p means the differences between the cortical widths of type IVa DDH and type IVb DDH; *p < 0.05, **p < 0.01 for the comparison between the DDH groups; #p < 0.05, ##p < 0.01, when compared with control group
GT greater trochanter, FH femoral head