Perioperative Blood Loss Can Be Reduced If Total Knee Arthroplasty Was Performed in the Si Hour-Period, Compared with the Wei Hour-Period: A Retrospective Cohort Study
Table 2
Comparison of blood loss, maximum Hb drop, transfusion, postoperative test and radiography, and LOS between the two groups.
Variable
Group A (n = 43)
Group B (n = 41)
Difference (95% CI)
value
TBL (ml)
953.2 ± 294.7
1152.6 ± 405.6
−199.4 (−352.8 to −46.1)
0.011
HBL (ml)
871.1 ± 292.2
1065.1 ± 410.0
−194.1 (−348.0 to −40.1)
0.014
VBL (ml)
82.1 ± 22.8
87.5 ± 25.7
−5.4 (−15.9 to 5.2)
0.314
Maximum Hb drop (g/L)
27.5 ± 11.0
32.6 ± 8.9
−5.1 (−9.5 to −0.7)
0.023
Transfusion (n, %)
2/4.7%
3/7.3%
—
0.956
LOS (days)
13.9 ± 5.9
13.9 ± 5.9
—
0.856
Post-HKA(°)
179.2 (1.2)
179.4 (1.2)
—
0.363
FTMA correction(°)
6.1 (3.2)
5.0 (5.5)
—
0.102
Postoperative test
Platelet count (109/L)
238.1 ± 48.4
210.2 ± 64.4
28.0 (3.1 to 52.9)
0.028
D-D (mg/L)
5.6 ± 2.0
5.0 ± 2.4
0.7 (−0.3 to 1.6)
0.181
PT (s)
11.5 (0.80)
11.6 (1.30)
—
0.771
INR
0.95 (0.08)
0.95 (0.12)
—
0.854
TBL, total blood loss; HBL, hidden blood loss; VBL, visible blood loss; Hb, hemoglobin; post-HKA, postoperative hip-knee-ankle angle; FTMA, femorotibial mechanical axis; D-D, D-dimer; PT, prothrombin time; INR, International Normalized Ratio. Student’s t test; χ2 test; Wilcoxon–Mann–Whitney test. Boldface indicates P value <0.05.
