Table 2 Blood flow parameter characteristics across stages of femoral head necrosis.

From: Clinical evaluation of blood flow in femoral head necrosis using color doppler ultrasound

Parameter

Stage I (2 hips)

Stage II (24 hips)

Stage III (24 hips)

Stage IV (2 hips)

Test value

p value

D (cm)

0.26 ± 0.03

0.22 ± 0.03a

0.21 ± 0.03a

0.20 ± 0.05a

F = 2.394

0.081

PSV (cm/s)

103.50 ± 2.12

59.13 ± 16.36a

42.85 ± 9.57ab

28.35 ± 0.21abc

F = 18.316

< 0.001

RI

0.97 ± 0.01

0.90 ± 0.04a

0.87 ± 0.04ab

0.76 ± 0.02abc

F = 11.092

< 0.001

PI

4.93 ± 0.33

2.96 ± 0.65a

2.57 ± 0.75a

1.46 ± 0.08abc

F = 10.213

< 0.001

  1. Compared to Stage I, ap < 0.05; compared to Stage II, bp < 0.05; compared to Stage III, cp < 0.05.
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