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 1
Comparison of baseline characteristics and clinical features between the 2 groups.
Variable
Group A (n = 43)
Group B (n = 41)
value
Male (n, %)
12/26.7%
14/33.3%
0.497
Age (years)
67.4 ± 7.5
68.8 ± 7.7
0.421
BMI (kg/m2)
25.7 ± 2.9
24.4 ± 3.5
0.079
ASA (I/II/III, n)
3/33/7
3/31/7
0.993
Operation of left side (n, %)
21/48.8%
16/39.0%
0.310
Comorbidity
Hypertension (n, %)
11/25.6%
10/24.4%
0.900
Diabetes (n, %)
1/2.3%
3/7.3%
0.575
Coronary heart disease (n, %)
0
2/4.9%
0.453
Operation time (min)
94.9 ± 12.4
97.7 ± 11.3
0.284
Pre-FTMA
Minimum∼maximum(°)
165.5∼195.7
163.4∼197.8
HKA (°)
173.6 (3.9)
175.6 (6.6)
0.110
Preoperative test
Hemoglobin (g/L)
130.9 ± 10.2
134.5 ± 12.3
0.146
Hematocrit (%)
39.8 ± 2.4
39.9 ± 3.3
0.833
Platelet count (109/L)
195.8 ± 38.4
189.9 ± 45.1
0.518
D-D (mg/L)
0.35 (0.35)
0.31 (0.29)
0.588
PT (s)
11.1 (0.70)
11.1 (0.70)
0.767
INR
0.91 (0.08)
0.90 (0.08)
0.654
BMI, body mass index; ASA, American Society of Anesthesiologists; Pre-FTMA, preoperative femorotibial mechanical axis; HKA, hip-knee-ankle angle; D-D, D-dimer; PT, prothrombin time; INR, International Normalized Ratio. χ2 test; Student’s t test; Wilcoxon–Mann–Whitney test.
