Table 1 Comparison of the standard group and the refractory group

Gender (Male: Female)

18:82

5:9

0.154

Age

62.3 ± 13.7

66.8 ± 7.7

0.231

Diagnosis (OA:ION:RA)

62:32:6

10:1:3

0.039^b

ASA-PS (I:II:III)

37:44:19

2:5:7

0.027^b

BMI

23.6 ± 3.8

23.7 ± 4.1

0.903

Preoperative Hb

12.6 ± 1.5

12.3 ± 1.4

0.411

Preoperative JOA hip score

38.8 ± 13.4

38.1 ± 17.6

0.864

Surgical time (minutes)

77.3 ± 23.7

115.1 ± 40.7

0.001^a

Intraoperative blood loss (ml)

256 ± 186

506 ± 558

0.001^a

Estimated total blood loss (ml)

835 ± 340

1084 ± 649

0.026^a

Allogeneic blood transfusion

13 (13%)

5 (36%)

0.045^b

Cup abduction angle (degrees)

41.0 ± 4.1

42.2 ± 7.9

0.388

Cup anteversion (degrees)

16.8 ± 5.1

18.5 ± 6.9

0.254

Cup safe zone

94 (94%)

11 (79%)

0.080

Stem varus angle (degrees)

0.1 ± 0.5

0.0 ± 0.0

0.494

Stem flexion angle (degrees)

0.6 ± 1.0

0.3 ± 0.7

0.262

Stem safe zone

94 (94%)

14 (100%)

1.000

Leg length discrepancy (mm)

6.4 ± 9.0

5.4 ± 7.4

0.673

Postoperative JOA hip score

 At three months

84.4 ± 9.4

77.9 ± 7.6

0.014^a

 At two years

87.8 ± 8.2

83.6 ± 6.1

0.066

Surgical complication (category 2 and 3)

5 (5%)

0 (0%)

1.000

Revision

1 (1%)

0 (0%)

1.000