Table 1. Baseline characteristics of the patients with a known diagnosis at the time of the needle-arthroscopy procedure.
| Characteristics | RA (n = 10) | SA (n = 4) | OA (n = 25) |
|---|---|---|---|
| Age in years, mean ± SD | 52.5 ±24.4 | 45.5 ±18.5 | 65.2 ±8.3 |
| Female gender n / % | 7 / 70.0% | 1 / 25% | 19 / 76.0% |
| ACR 1987 RA criteria positivity n / % | 10 / 100% | 0 / 0% | 0 / 0% |
| ACR/EULAR criteria 2010 n / % | 10 / 100% | 0 / 0% | 0 / 0% |
| Morning stiffness > 1hour n / % | 9 / 90% | 1 / 25% | 2 / 8.0% |
| Swollen joint count (28 assessed), mean ± SD | 8.4 ±3.5 | 1.75 ±0.5 | 1.6 ±1.4 |
| Arthritis of hands n / % | 10 / 100% | 0 / 0% | 1 / 4.0% |
| Symmetrical involvement of joints n / % | 10 / 100% | 2 / 50% | 9 / 36.0% |
| Psoriasis n / % | 0 / 0% | 4 / 100% | 0 / 0% |
| ACPA positivity n (%) | 8 / 80% | 0 / 0% | 0 / 0% |
| Rheumatoid factor positivity n / % | 9 / 90% | 0 / 0% | 3 / 12.0% |
| X-ray erosions n / % | 6 / 60% | 0 / 0% | 0 / 0% |
| CRP > normal value n / % | 10 / 100% | 1 / 25% | 1 / 4.0% |