Fig. 4

Synovial inflammation in OA and RA. a-d. Representative sections of synovia from cases with median Krenn scores for each disease group stained with haematoxylin and eosin. Panels represent post-mortem, PM (a), non-inflamed OA, OANI (b), inflamed OA, OAI (c) and RA (d) cases. Scale bars = 100 μm. e. Synovitis, determined as total Krenn score was greatest in OAI and RA cases. f. Numbers of MGCs per area of synovium were positively correlated with synovitis scores both in OA and in RA cases