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Joint involvement in polymyositis/dermatomyositis

G Citera1, M A Gõni, J A Maldonado Cocco

  • 1Rheumatology Department, Instituto Nacional de Rehabilitación, Buenos Aires, Argentina.

Clinical Rheumatology
|March 1, 1994
PubMed
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Joint involvement, or arthritis, affects over a quarter of polymyositis/dermatomyositis patients. This arthritis typically presents with mild symptoms and responds well to treatment, with no lasting joint damage observed.

Area of Science:

  • Rheumatology and Immunology
  • Myositis and Autoimmune Diseases

Background:

  • Polymyositis/dermatomyositis (PM/DM) are idiopathic inflammatory myopathies.
  • Joint involvement (arthritis) is a recognized, though not fully characterized, feature in some PM/DM patients.

Purpose of the Study:

  • To determine the frequency and clinical characteristics of joint involvement in patients diagnosed with polymyositis/dermatomyositis.
  • To compare patients with and without arthritis to identify any distinguishing features or associations.

Main Methods:

  • Retrospective evaluation of 29 patients diagnosed with polymyositis/dermatomyositis.
  • Assessment of joint involvement, including type (oligoarthritis, polyarthritis) and timing relative to myositis symptoms.
  • Comparison of clinical and serological data between patients with and without arthritis.

Related Experiment Videos

Main Results:

  • Arthritis was present in 27.5% (8 out of 29) of the evaluated PM/DM patients.
  • Arthritis was typically concurrent with muscle involvement and often presented as oligoarthritis.
  • No significant clinical or serological differences were found between arthritis and non-arthritis groups, except for a male predominance in the arthritis group (75% vs 19%, p < 0.05).

Conclusions:

  • Joint involvement is a notable feature in a significant subset of polymyositis/dermatomyositis patients.
  • Arthritis in PM/DM appears to be generally mild, responds well to treatment of the underlying myositis, and does not lead to articular sequelae.
  • The male predominance in the arthritis subgroup warrants further investigation.