Table 3.
Ordinal logistic regression of the risk factors for blood loss in AS patients with hip involvement undergoing THA
| Parameter | OR (95% CI) | P value |
|---|---|---|
| Male sex | 3.287 (1.022 to 10.567) | 0.046 |
| BMI | 0.960 (0.897 to 1.027) | 0.236 |
| Bilateral THA | 13.896 (4.950 to 39.011) | < 0.0001 |
| Hip ROM = 0° | 2.513 (1.277 to 4.946) | 0.008 |
| BASRI-hip score of 4 | 0.700 (0.345 to 1.421) | 0.324 |
| Elevated ESR level | 3.042 (1.320 to 7.014) | 0.009 |
| Elevated CRP level | 0.885 (0.415 to 1.888) | 0.752 |
| TT (s) | 1.189 (0.880 to 1.606) | 0.260 |
| APTT (s) | 0.964 (0.901 to 1.032) | 0.291 |
| Fibrinogen(g/L) | 0.780 (0.562 to 1.081) | 0.136 |
| Platelet level( × 109/L) | 0.997 (0.992 to 1.002) | 0.211 |
| Preoperative Hb level (g/L) | 1.043 (1.017 to 1.070) | 0.001 |
| Iliopsoas and adductor release | 1.934 (0.860 to 4.350) | 0.111 |
| Administration of TXA | 0.252 (0.134 to 0.472) | < 0.0001 |
| Chemoprophylaxis of thrombosis | 1.814 (0.896 to 3.674) | 0.098 |
| Operating time (min) | 1.009 (1.003 to 1.016) | 0.004 |
AS ankylosing spondylitis, THA total hip arthroplasty, OR odds ratio, CI confidence interval, 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, Hb hemoglobin, TXA tranexamic acid