From: Effects of knee position on blood loss following total knee arthroplasty: a randomized, controlled study
Flexion group
Extension group
P value
Age (years)
73.1 ± 5.1
72.4 ± 4.6
0.68
Gender (female/male)
34/16
32/18
0.67
Affected side (L/R)
22/28
24/26
0.69
Preoperative Hb (g/dL)
13.3 ± 1.4
12.8 ± 1.7
0.34
Preoperative ROM
93.9 ± 18.9
92.3 ± 21.5
0.80