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Table 3 Characteristics of nutrient foramina in the fovea capitis femoris of non-traumatic osteonecrosis vs. traumatic osteonecrosis of the femoral head

From: Insufficient blood supply of fovea capitis femoris, a risk factor of femoral head osteonecrosis

Characteristic

Non-traumatic osteonecrosis (N = 118)

Traumatic osteonecrosis (N = 31)

P-value

Number of nutrient foramina

  

0.142

 0

102 (86.44%)

24 (77.42%)

 

 1–3

16 (13.56%)

6 (19.35%)

 

 4–6

0 (0.00%)

0 (0.00%)

 

 > 6

0 (0.00%)

1 (3.23%)

 

Area

 Total area of nutrient foramina, mm2

0.23 ± 0.85

0.59 ± 1.22

0.131

 Mean area of nutrient foramina, mm2

0.15 ± 0.54

0.22 ± 0.47

0.481

Diameter

 Maximum diameter of the nutrient foramen, mm

0.15 ± 0.46

0.29 ± 0.56

0.171

 Minimum diameter of the nutrient foramen, mm

0.12 ± 0.36

0.21 ± 0.42

0.248

  1. Data are presented as mean ± SD or n (%)