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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 (%)