AHSG and Sacroiliac arthritis: Fetuin-A levels were significantly lower in patients with radiographic sacroiliitis compared to those without at T0 (207.9 (181.7–215.9) vs. 239.9 (217.9–286.9), respectively, p < 0.001) and at T24 (207.6 (182.5–246.5) vs. 261.1 (210.2–286.6) μg/mL, p = 0.03).