Table 1.
Baseline characteristics of the AS patients with hip involvement undergoing THA
| Baseline characteristic | Valuesa | Rangeb |
|---|---|---|
| Clinical characteristics | ||
| Age (years) | 32 | 19 to 67 |
| Male (n, %) | 218 (89.7%) | |
| BMI (kg/m2) | 22.64 | 11.87 to 37.11 |
| Disease duration (years) | 11 | 0.5 to 40.3 |
| Hospital stay (days) | 11 | 6 to 46 |
| Smoking history (n, %) | 38 (15.6%) | |
| Bilateral THA (n, %) | 163 (67.1%) | |
| Hip ROM = 0°(n, %) | 121 (49.8%) | |
| BASRI-hip (number of cases at involved hip) | ||
| 3 (n, %) | 178 (43.8%) | |
| 4 (n, %) | 228 (56.2%) | |
| Preoperative laboratory values | ||
| Elevated ESR level (> 15 mm/h for male and > 20 mm/h for female, n, %) | 132 (54.3%) | 1 to 99 |
| Elevated CRP level (> 1 mg/dL, n, %) | 165 (67.9%) | 0.1 to 11.6 |
| TT (s) | 16.1 ± 1.0 | 12.3 to 19.4 |
| APTT (s) | 40.4 ± 4.9 | 30.3 to 54.0 |
| PT (s) | 13.5 ± 0.8 | 11.4 to 16.2 |
| PT (%) | 94.4 ± 12.0 | 63.6 to 123.0 |
| INR | 1.05 ± 0.08 | 0.88 to 1.30 |
| Fibrinogen level (g/L) | 4.23 | 1.76 to 13.10 |
| Platelet level (× 109/L) | 273 ± 72 | 103 to 509 |
| Hb level (g/L) | 133 ± 16 | 90 to 171 |
| Hct (L/L) | 0.404 ± 0.043 | 0.284 to 0.512 |
| Perioperative data | ||
| Periprosthetic fracture (n, %) | 10 (4.1%) | |
| Iliopsoas and adductor release (n, %) | 41 (16.9%) | |
| Administration of TXA (n, %) | 159 (65.4%) | |
| Chemoprophylaxis of thrombosis (n, %) | 183 (75.3%) | |
| Autologous transfusion (n, %) | 66 (27.2%) | |
| Unilateral THA (n = 80) | 11 (13.8%) | |
| Bilateral THA (n = 163) | 53 (32.5%) | |
| Allogenic transfusion (n, %) | 229 (94.2%) | |
| Unilateral THA (n = 80) | 67 (83.8%) | |
| Bilateral THA (n = 163) | 162 (99.4%) | |
| Operating time (min) | 180 | 55 to 455 |
| Unilateral THA | 90 | 55 to 285 |
| Bilateral THA | 205 | 70 to 455 |
| CBL (mL) | 1223 ± 542 | 162 to 3098 |
| Unilateral THA | 790 ± 342 | 162 to 1901 |
| Bilateral THA | 1435 ± 495 | 453 to 3098 |
AS ankylosing spondylitis, THA total hip arthroplasty, BMI body mass index, ROM range of motion, BASRI-hip Bath Ankylosing Spondylitis Radiology Hip Index, ESR erythrocyte sedimentation rate, CRP C-reactive protein, TT thromboplastin time, APTT activated partial thromboplastin time, PT prothrombin time, PT% prothrombin activity, INR international normalized ratio, Hb hemoglobin, Hct hematocrit, TXA tranexamic acid, BV blood volume, CBL calculated blood loss
aMean ± SD or median
bMinimum to maximum