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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