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Table 4 Characteristics of the two groups on duplex ultrasonography

From: No difference in the incidence or location of deep venous thrombosis according to use of pharmacological prophylaxis following total knee arthroplasty

Variable

Group 1

Group 2

P value

Compressibility (firm/soft)

21/13

36/9

0.07a

Echogenicity (hyperechoic/isoechoic/hypoechoic)

1/14/19

2/17/26

0.91b

Mean vein diameter (mm)

5.6 ± 1.7

5.4 ± 1.5

0.49c

Attachment of thrombus to vein wall

Attached, 34; free-floating, 0

Attached, 44; free-floating, 1

1.00a

  1. Data are shown as the number or as the mean ± standard deviation. Group 1, patients who received pharmacologic prophylaxis. Group 2, patients who did not receive pharmacologic prophylaxis. aChi-squared test; bCochran-Armitage test; cMann–Whitney U test