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Table 1 Characteristics of nutrient foramina in the fovea capitis femoris of the normal femoral head vs. necrotic femoral head

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
  1. Data are presented as mean ± SD or n (%). Significant values are shown in bold