Table 1.

Detailed scoring regulations of synovium histomorphology

	Cell stroma	Inflammatory infiltrate
1 point	The cellularity is slightly increased	Few situated lymphocytes or plasma cells
2 points	The cellularity is moderately increased; multinucleated cells might occur	Many lymphocytes or plasma cells, sometimes follicle-like aggregates
3 points	The cellularity is greatly increased; multinucleated giant cells, pannus formation, and granulomas might occur	Dense band-like inflammatory infiltrate or numerous large follicle-like aggregates