Table 2.

Histological scoring criteria

	Histological findings	Score
Synovial thickening	Lining cell layer 1–2 cells thick	0
	Lining cell layer 3–5 cells thick	1
	Lining cell layer 6–8 cells thick and/ or mild increase in cellularity	2
	Lining cell layer > 9 cells thick and/ or severe increase in cellularity	3
Inflammatory cell infiltration	None	0
	Slight	1
	Moderate	2
	Severe	3