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

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

  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
  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