Fig. 3

Histological analysis of synovium from patients with rheumatoid arthritis (RA; n = 8) and osteoarthritis (OA; n = 6) before and after 7 days of suspended culture. a Representative sections stained with hematoxylin and eosin. Each synovium was assigned to one of three grades according to the thickness of the synovial intima: grade 1 = synovial intima less than four cells thick; grade 2 = synovial intima four to six cells thick; and grade 3 = synovial intima seven or more cells thick. b Synovial intima grade before and after 7 days of suspended synovium culture. Bef: before, Aft: after, NS: not significant