Baseline Characteristics | No Tourniquet (n = 1423) | Tourniquet use (n = 4902) | All patients (n = 6325) | P values |
---|---|---|---|---|
Demographic characteristics | ||||
 Age (M ± SD) | 66.67 ± 8.77 | 66.58 ± 8.74 | 66.60 ± 8.75 | 0.722 |
 Female, N (%) | 1099 (77.23%) | 3872 (78.99%) | 4971 (78.59%) | 0.155 |
 BMI | 24.89 ± 3.56 | 25.83 ± 3.5.36 | 25.62 ± 5.02 | 0.000* |
 Diagnoses, N (%) |  |  |  | 0.145 |
  OA | 1321 (92.83%) | 4603 (93.90%) | 5924 (93.66%) |  |
  Inflammatory arthritis | 102 (7.17%) | 299 (6.10%) | 401 (6.34%) |  |
 Comorbidities, N (%) | ||||
  Hypertension | 224 (15.74%) | 1483 (30.25%) | 1707 (26.99%) | 0.000* |
  Type 2 diabetes | 51 (3.58%) | 382 (7.79%) | 433 (6.85%) | 0.000* |
  CHD | 15 (1.05%) | 202 (4.13%) | 217 (3.43%) | 0.000* |
  COPD | 4 (0.28%) | 30 (0.61%) | 34 (0.54%) | 0.133 |
 Preoperative analgesic use N (%) | 241 (16.94%) | 1551 (31.64%) | 1792 (28.33%) | 0.000* |
 Preoperative laboratories | ||||
  Preoperative Hb (g/L) | 128.54 ± 15.24 | 132.04 ± 16.02 | 131.25 ± 15.91 | 0.000* |
  Preoperative ALB (g/L) | 41.72 ± 2.54 | 40.86 ± 2.98 | 40.83 ± 2.89 | 0.095 |
 Operative variables | ||||
  Anesthesia, N (%) |  |  |  | 0.000* |
   General | 1271 (89.32%) | 3056 (62.34%) | 4327 (68.41%) |  |
   Regional | 152 (10.68%) | 1846 (37.66%) | 1998 (31.59%) |  |
  ASA class, N (%) |  |  |  | 0.007* |
    < 3 | 1303 (91.57%) | 4367 (89.09%) | 5670 (89.64%) |  |
    ≥ 3 | 120 (8.43%) | 535 (10.91%) | 655 (10.36%) |  |
  TXA use N (%) | 639 (44.91%) | 2758 (56.26%) | 3397 (53.71%) | 0.000* |
  Drain use, N (%) | 564 (39.63%) | 3976 (81.11%) | 4540 (71.78%) | 0.000* |
  Intraoperative blood loss (mL) | 168.43 ± 100.56 | 166.55 ± 97.71 | 166.97 ± 98.36 | 0.526 |
  Operative time (min) | 81.60 ± 27.28 | 87.32 ± 29.51 | 86.03 ± 29.12 | 0.000* |