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Table 1 Comparison of the standard group and the refractory group
| Standard group (n = 100) | Refractory group (n = 14) | p values | |
|---|---|---|---|
| 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 | 0.039b |
| ASA-PS (I:II:III) | 37:44:19 | 2:5:7 | 0.027b |
| 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 | 0.001a |
| Intraoperative blood loss (ml) | 256 ± 186 | 506 ± 558 | 0.001a |
| Estimated total blood loss (ml) | 835 ± 340 | 1084 ± 649 | 0.026a |
| Allogeneic blood transfusion | 13 (13%) | 5 (36%) | 0.045b |
| 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 | 0.014a |
| 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 |
