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Table 1 Comparison of the standard group and the refractory group

From: Direct anterior approach for total hip arthroplasty with a novel mobile traction table -a prospective cohort study

  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
  1. OA osteoarthritis, ION idiopathic osteonecrosis, RA rheumatoid arthritis, ASA-PS American Society of Anesthesiologists-Physical status, BMI body mass index, Hb hemoglobin, JOA Japanese Orthopedic Association. Mean ± standard deviation
  2. aStudent’s t-tests and bPearson χ 2 tests