Table 1.
Baseline Characteristics of AS Patients with Advanced Hip Involvement
| Values | Range | |
|---|---|---|
| Demographics | ||
| Age at surgery (years) | 32 | 19 to 67 |
| Male (n, %) | 218(89.7%) | |
| BMI (kg/m2) | 22.50 | 11.87 to 41.62 |
| Clinical characteristics | ||
| Age at onset (years) | 18 | 5 to 56 |
| Bilateral onset in hips (n, %) | 238(63.8%) | |
| Disease duration (years) | 10.5 | 0.5 to 40.3 |
| Administration of TNF inhibitors (n, %) | 36(9.7%) | |
| Family history of rheumatism (n, %) | 39(10.5%) | |
| Smoking history (n, %) | 53(14.2%) | |
| BASRI-hip (No. of cases in hips) | ||
| 0 (n, %) | 20(2.7%) | |
| 1 (n, %) | 39(5.2%) | |
| 2 (n, %) | 37(4.9%) | |
| 3 (n, %) | 313(42.0%) | |
| 4 (n, %) | 337(45.2%) | |
| Bilateral THA (n, %) | 251(67.3%) | |
| Preoperative laboratory values | ||
| ESR (mm/h) | 17 | 1 to 108 |
| CRP (mg/dL) | 1.61 | 0.10 to 17.87 |
Note: The continuous values are presented as medians, with ranges from minimum to maximum.
Abbreviations: AS, ankylosing spondylitis; BMI, body mass index; TNF, tumour necrosis factor; BASRI-hip, the Bath Ankylosing Spondylitis Radiology Hip Index; THA, total hip arthroplasty; ESR, erythrocyte sedimentation rate; CRP, C-reactive protein.