Cellular Analysis of Synovial Fluid Reveals Unique Inflammatory Profiles in Late-Onset Rheumatoid Arthritis and Polymyalgia Rheumatica
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By
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Shigeru Tanaka
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Takahiro Sugiyama
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Shuhei Kameda
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Tatsuro Takahashi
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Masahiro Yasui
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Yuki Hayashi
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Tomoaki Ida
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Yuhi Yoshida
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Soichiro Kubota
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Takashi Ito
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Takahiro Kageyama
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Daiki Nakagomi
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Kei Ikeda
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Shin-Ichiro Kagami
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Hiroshi Nakajima
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July 1, 2026
Clinical Scorecard: Cellular Analysis of Synovial Fluid Reveals Unique Inflammatory Profiles in Late-Onset Rheumatoid Arthritis and Polymyalgia Rheumatica
At a Glance
| Category | Detail |
|---|
| Condition | Late-Onset Rheumatoid Arthritis and Polymyalgia Rheumatica |
| Key Mechanisms | Differentiation of inflammatory profiles in synovial fluid. |
| Target Population | Patients aged 60 years or older with late-onset inflammatory arthritis. |
| Care Setting | Tertiary referral hospitals. |
Key Highlights
- LORA is defined as RA with onset at 60 years or older.
- ACPA-negative LORA and PMR can present similarly, complicating diagnosis.
- Synovial fluid analysis may provide more accurate disease-specific signatures.
- Study included 21 East Asian patients with ACPA-positive LORA, ACPA-negative LORA, and PMR.
- Active inflammation confirmed by musculoskeletal ultrasound.
Guideline-Based Recommendations
Diagnosis
- Fulfillment of 2010 ACR/EULAR classification criteria for RA.
- Fulfillment of 2012 provisional classification criteria for PMR.
Management
- Consideration of comorbidities and therapeutic risks in treatment.
Monitoring & Follow-up
- Clinical re-evaluation of initial diagnosis six months after enrollment.
Risks
- Increased therapeutic risks due to comorbidities in elderly patients.
Patient & Prescribing Data
Elderly patients aged 60 years or older.
Management strategies should account for potential comorbidities.
Clinical Best Practices
- Use ultrasound to confirm active inflammation before treatment.
- Ensure anatomical consistency in synovial fluid aspiration.
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