Table 2 Comparison of the first 50 cases and the second 50 cases in the standard group

Gender (Male:Female)

7:43

11:39

0.436

Age

64.5 ± 13.4

60.1 ± 13.7

0.110

Diagnosis (OA:ION:RA)

30:16:4

32:16:2

0.694

ASA-PS (I:II:III)

17:20:13

20:24:6

0.203

BMI

23.8 ± 3.8

23.4 ± 3.8

0.674

Preoperative Hb

12.3 ± 1.4

13.0 ± 1.5

0.020^a

Preoperative JOA hip score

34.9 ± 12.2

42.8 ± 13.5

0.003^a

Surgical time (minutes)

82.5 ± 27.1

72.0 ± 18.6

0.027^a

Intraoperative blood loss (ml)

263 ± 172

249 ± 201

0.704

Estimated total blood loss (ml)

866 ± 361

803 ± 318

0.359

Allogeneic blood transfusion

12 (24%)

1 (2%)

0.001^b

Cup abduction angle (degrees)

41.9 ± 4.5

40.1 ± 3.6

0.032^a

Cup anteversion (degrees)

17.7 ± 6.0

15.8 ± 3.9

0.070

Cup safe zone

44 (88%)

50 (100%)

0.027^b

Stem varus angle (degrees)

0.1 ± 0.8

0.1 ± 0.6

0.888

Stem flexion angle (degrees)

0.5 ± 1.1

0.7 ± 0.9

0.165

Stem safe zone

47 (94%)

47 (94%)

1.000

Leg length discrepancy (mm)

5.0 ± 5.7

7.9 ± 11.2

0.109

Postoperative JOA hip score

 At three months

85.1 ± 10.4

83.7 ± 8.3

0.478

 At two years

89.0 ± 8.0

86.7 ± 8.3

0.176

Surgical complication (category 2 and 3)

3 (6%)

2 (4%)

1.000

Revision

1 (2%)

0 (0%)

0.999