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J R Soc Med. 1987 September; 80(9): 556–558.
PMCID: PMC1290998

Indices of disease activity in psoriatic arthritis.


Psoriatic arthritis (PA) may respond to disease-modifying antirheumatic therapy. The value of assessing disease activity with indices devised for rheumatoid arthritis (RA) was investigated in 72 patients with seronegative PA. Thirty patients had a peripheral polyarthritis including the distal interphalangeal joints (DIPJs) and 15 a symmetrical arthritis sparing DIPJs (RA-like). Significant correlations (Spearman rank test) were seen between the clinical variables (pain score, grip strength, Ritchie articular index and a summated index of disease activity) in these two groups. Ten patients with a markedly asymmetrical arthritis showed a poor correlation between clinical variables. Although the objective indices - erythrocyte sedimentation rate (ESR) and C-reactive protein - correlated together in the first two groups, the ESR correlated solely with clinical indices, and then only in RA-like patients. These results cast some doubt on the value of assessment methods based on RA when evaluating subgroups of PA other than RA-like disease.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
  • Moll JM, Wright V. Psoriatic arthritis. Semin Arthritis Rheum. 1973;3(1):55–78. [PubMed]
  • Kammer GM, Soter NA, Gibson DJ, Schur PH. Psoriatic arthritis: a clinical, immunologic and HLA study of 100 patients. Semin Arthritis Rheum. 1979 Nov;9(2):75–97. [PubMed]
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  • Ritchie DM, Boyle JA, McInnes JM, Jasani MK, Dalakos TG, Grieveson P, Buchanan WW. Clinical studies with an articular index for the assessment of joint tenderness in patients with rheumatoid arthritis. Q J Med. 1968 Jul;37(147):393–406. [PubMed]
  • Mallya RK, Mace BE. The assessment of disease activity in rheumatoid arthritis using a multivariate analysis. Rheumatol Rehabil. 1981 Feb 1;20(1):14–17. [PubMed]

Articles from Journal of the Royal Society of Medicine are provided here courtesy of Royal Society of Medicine Press