Ann Rheum Dis 2000;59:945-953 ( December )

Extended report

Comparative study of the synovial histology in rheumatoid arthritis, spondyloarthropathy, and osteoarthritis: influence of disease duration and activity D Baeten^a, P Demetter^b, C Cuvelier^b, F Van den Bosch^a, E Kruithof^a, N Van Damme^a, G Verbruggen^a, H Mielants^a, E M Veys^a, F De Keyser^a

^a Department of Rheumatology, University Hospital, University of Ghent, Belgium, ^b Department of Pathology, University Hospital, University of Ghent, Belgium

Correspondence to: Dr D Baeten, Department of Rheumatology, 0K12IB, University Hospital Ghent, De Pintelaan 185, 9000 Ghent, Belgium dominique.baeten{at}rug.ac.be

Accepted for publication 1 May 2000

OBJECTIVESTo compare the macroscopic and microscopic characteristics of synovial tissue in rheumatoid arthritis (RA), spondyloarthropathy (SpA), and osteoarthritis (OA) after exclusion of possible biases induced by disease duration or activity, or both.
METHODSSynovial biopsy specimens were obtained by needle arthroscopy in patients with early RA (n=16), late RA (n=14), early SpA (n=23), and OA (n=12). Macroscopic and microscopic features were scored on a four point scale and analysed as a function of disease duration (early versus late RA), local and systemic disease activity, and diagnosis.
RESULTSExcept for the maximal synovial lining thickness, no significant differences were seen between early and late RA. For disease activity, synovial histology was only weakly correlated with C reactive protein in RA, but seemed to be strongly dependent on effusion of the biopsied joint in all disease groups. After stratification for local disease activity, no disease related differences were found in patients without joint effusion. In contrast, important differences were found between patients with RA and SpA with active joint effusion. Synovial vascularity was macroscopically increased in SpA versus RA (p=0.017). A straight vessel pattern was only seen in RA, while tortuous vessels were preferentially seen in SpA. Vascularity was also microscopically increased in SpA compared with RA (p=0.031), and correlated with the macroscopic vascularity (r_s=0.36, p=0.036). CD3+ (p=0.008), CD4+ (p=0.008), and CD20+ (p=0.024) lymphocytes were overrepresented in RA compared with SpA. The integrin expression in RA was characterised by a decrease of V3 in the synovial lining (p=0.006) and an increase of V5 in the sublining (p<0.001).
CONCLUSIONSThe immune architecture of the synovial membrane is more dependent on local disease activity than on disease duration. Synovium obtained from clinically affected joints shows important histological differences between RA and SpA.

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© 2000 by Annals of the Rheumatic Diseases
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