From: Insufficient blood supply of fovea capitis femoris, a risk factor of femoral head osteonecrosis
Characteristic | Normal femoral head (N = 100) | Necrotic femoral head (N = 149) | P-value |
---|---|---|---|
Number of nutrient foramina | < 0.001 | ||
0 | 44 (44.00%) | 126 (84.56%) | |
1–3 | 36 (36.00%) | 22 (14.77%) | |
4–6 | 16 (16.00%) | 0 (0.00%) | |
> 6 | 4 (4.00%) | 1 (0.67%) | |
Area | |||
Total area of nutrient foramina, mm2 | 0.88 ± 1.20 | 0.30 ± 0.95 | < 0.001 |
Mean area of nutrient foramina, mm2 | 0.33 ± 0.48 | 0.16 ± 0.53 | 0.014 |
Diameter | |||
Maximum diameter of the nutrient foramen, mm | 0.54 ± 0.55 | 0.18 ± 0.49 | < 0.001 |
Minimum diameter of the nutrient foramen, mm | 0.38 ± 0.41 | 0.14 ± 0.37 | < 0.001 |