Introduction
Rheumatoid arthritis and ankylosing spondylitis are among the most common rheumatic diseases. The coexistence of both affections in a single patient is highly infrequent but seems to be underestimated in clinical practice.
Materials and methods
We described the clinical, biological, and radiological characteristics of 12 patients with concomitant rheumatoid arthritis and ankylosing spondylitis diagnosed at our hospital. The 28 disease activity score (DAS28), the Bath ankylosing spondylitis disease activity index (BASDAI), and the Ankylosing Spondylitis Disease Activity Score (ASDAS) were used as outcome measures.
Results
Twelve patients with a male-to-female ratio of 0.71 and a mean age of 62.1 ± 12.8 years were included. Rheumatoid arthritis was the first disease diagnosed in seven patients. The mean duration of rheumatoid arthritis diagnosis at the time of ankylosing spondylitis diagnosis was 20.2 ± 25 months. The first sign of ankylosing spondylitis in rheumatoid arthritis patients was incidental radiological sacroiliitis in four patients, inflammatory low back pain in three patients, and distal interphalangeal joint involvement in hands radiographs in two patients. Rheumatoid arthritis was seronegative in four patients. Erosions were observed on radiographs of the hands and/or feet in 66% of the cases and almost all the patients (11/12) had sacroiliitis on imaging studies. The mean values of the DAS28, ASDAS, and BASDAI scores at the initial diagnosis of rheumatoid arthritis/ankylosing spondylitis were 4.54 ± 1.22, 3.1 ± 0.72, and 4.1 ± 0.5, respectively.
Conclusion
The coexistence of Rheumatoid arthritis and ankylosing spondylitis is uncommon but should be considered. We could not draw a conclusion about whether the association of both disease conditions confers different characteristics.
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