| Patient background (n=408) | Statistical date |
|---|---|
| Age, years | 64.9±8.2 |
| BMI, kg/m2 | 21.9±3.6 |
| Operation time, min | 100±40 |
| Disease duration, years | 16.8±10.2 |
| DAS28-ESR | 3.95±0.99 |
| Preoperative CRP mg/dl | 1.33±2.16 |
| Major OP (%) | 171 (41.9%) |
| Foot OP (%) | 126 (30.9%) |
| Biologics (%) | 129 (31.6%) |
| DMARDs (%) | 376 (92.2%) |
| PSL, mg/day | 2.5±2.8 |