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Journal of Primary Health Care Journal of Primary Health Care Society
Journal of The Royal New Zealand College of General Practitioners
RESEARCH ARTICLE (Open Access)

Unilateral knee effusion in an elderly patient: an unusual presentation of rheumatoid arthritis

Morteza Khodaee 1 3 , Lindsay Ogle 2 , Cleveland Piggott 1
+ Author Affiliations
- Author Affiliations

1 University of Colorado School of Medicine, Department of Family Medicine & Orthopedics, Division of Sports Medicine, AF Williams Clinic, Denver, Colorado, USA

2 University of Colorado School of Medicine, Swedish Family Medicine Residency, Aurora, Colorado, USA

3 Corresponding author. Email: Morteza.khodaee@cuanschutz.edu

Journal of Primary Health Care 12(4) 391-394 https://doi.org/10.1071/HC20035
Published: 16 September 2020

Journal Compilation © Royal New Zealand College of General Practitioners 2020 This is an open access article licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License

Abstract

Unilateral atraumatic knee effusion is a relatively common presenting complaint among geriatric patients in primary care and musculoskeletal speciality clinics. Gout, pseudogout, degenerative joint diseases and reactive arthritis are the most common causes of the atraumatic knee effusions. Rheumatoid arthritis very rarely presents as arthritis of one or two large joints. Arthrocentesis, plain radiography and screening blood tests should be performed to help narrow the differential diagnosis. In some cases, advanced imaging modalities such as MRI may be indicated. This study reports a case of rheumatoid arthritis in a 75-year-old gentleman with oligoarthropathy of two large joints as the presenting symptoms.

KEYwords: Synovitis; rheumatoid arthritis; arthrocentesis; oligoarthropathy


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