Ultrasonography (US) and histological findings
| Superior | Lateral | Medial | Mean overall score* | |
| Median US synovitis grade (0–3 semiquantitative score) (Q1–Q3) | 1 (0–2) | 1 (1–2) | 1 (0–2) | 1 (0–2) |
| Median measured synovial thickness (mm) (Q1–Q3) | 1.55 (0.8–4.3) | 2.1 (1.3–3.1) | 2.05 (0.3–3.4) | 1.6 (1.1–3.2) |
| Median US synovitis grade (Doppler mode) (0–3 semiquantitative score) (Q1–Q3) | 0 (0–2) | 0 (0–1) | 0 (0–2) | 0 (0–2) |
| Median histological synovitis score (0–4) (Q1–Q3) | 2 (1–2) | 1 (1–2.8) | 2 (1–3) | 2 (1–2.5) |
| Median CD68 score (Q1–Q3) | 3 (2.75–4) | 3 (2–3) | 3 (2–3) | 3 (2–3.5) |
| Mean number of vessels per slide (absolute number with FVIII staining) (SD) | 8.3 (5.4) | 11 (6.3) | 16 (8.0) | 10.2 (6.3) |
*Overall scores are the mean scores of the three compartments.
FVIII, factor VIII staining; Q1–Q3, first and third quartiles.