Table 5: Effect of erosion, osteitis, and synovitis at baseline on subsequent progression of erosion.

MRI featureNumber of bones involved RAMRIS Erosion Scores 
Mean (SD)
% erosion
Baseline24 weeks

−ERO81300.02 (0.13)2.7
+ERO4321.02 (0.63)1.09 (0.67)12.0
−OST10170.24 (0.50)0.27 (0.55)4.1
+OST2280.89 (0.77)0.95 (0.78)14.0
−SYN4650.21 (0.50)0.22 (0.54)2.8
+SYN6790.47 (0.66)0.52 (0.70)8.2
+ERO −OST2510.95 (0.57)1.03 (0.63)10.0
+ERO +OST1811.12 (0.70)1.17 (0.71)14.9
+ERO −SYN871.10 (0.59)1.18 (0.65)12.6
+ERO +SYN3181.01 (0.64)1.07 (0.67)12.3

Based on 1245 bones evaluable for ERO or OST and 1144 bones evaluable for adjacent SYN. progression defined as ≥0.5; ERO: erosion; OST: osteitis; SYN: synovitis.