First 50 cases | Second 50 cases | p values | |
---|---|---|---|
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 | 0.020a |
Preoperative JOA hip score | 34.9 ± 12.2 | 42.8 ± 13.5 | 0.003a |
Surgical time (minutes) | 82.5 ± 27.1 | 72.0 ± 18.6 | 0.027a |
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%) | 0.001b |
Cup abduction angle (degrees) | 41.9 ± 4.5 | 40.1 ± 3.6 | 0.032a |
Cup anteversion (degrees) | 17.7 ± 6.0 | 15.8 ± 3.9 | 0.070 |
Cup safe zone | 44 (88%) | 50 (100%) | 0.027b |
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 |