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Updated: May 14, 2026
Synovial Fluid Analysis to Identify Osteoarthritis
Published on: October 20, 2022
Targeting synovial inflammation in knee osteoarthritis: translational insights for diagnosis and therapy
Ali Mobasheri1,2,3,4, Francisco Castro-Domínguez5, Oreste Gualillo6,7
1Research Unit of Health Sciences and Technology, Faculty of Medicine, University of Oulu, Oulu, Finland.
Abstract:
Synovial inflammation is a central feature of knee osteoarthritis (OA), linking systemic and local pathogenic pathways with clinical outcomes. This review synthesises current knowledge on synovial structure and function, and the molecular mechanisms that drive synovitis, including metaflammation, mechanoflammation, mechanotransduction, and immune cell polarisation. It further explores how these processes contribute to structural degeneration, pain, and disease progression. Diagnostic approaches are discussed, with emphasis on biochemical biomarkers, imaging modalities, and the limited reliability of pain alone as a disease marker. By integrating clinical phenotypes with molecular endotypes, the review features how precision medicine can reshape OA care. Therapeutic strategies are presented across the translational spectrum, from oral and intra-articular drugs in clinical use to emerging investigational therapies, multitargeting approaches, and novel gene therapies. This review advocates for phenotype- and endotype-informed interventions as a pathway to more effective and personalised management of synovitis-driven knee OA. The translational value of this work lies in integrating molecular mechanisms with clinical strategies to guide early diagnosis, refine therapeutic targeting, and inform the design of future trials.
Insights
Synovial inflammation drives knee osteoarthritis (OA) progression. Understanding its molecular mechanisms and integrating clinical phenotypes with molecular endotypes can personalize treatments for better outcomes in OA management.
Area of Science:
- Orthopedics
- Immunology
- Molecular Biology
Background:
- Synovial inflammation is central to knee osteoarthritis (OA), connecting systemic and local pathways to clinical outcomes.
- Current understanding of OA pathogenesis involves metaflammation, mechanoflammation, and immune cell polarization within the synovium.
Purpose of the Study:
- To synthesize current knowledge on synovial structure, function, and molecular mechanisms driving synovitis in knee OA.
- To explore the contribution of these processes to OA progression, including structural degeneration and pain.
- To discuss diagnostic approaches and therapeutic strategies for synovitis-driven knee OA.
Main Methods:
- Literature review synthesizing current research on synovial inflammation in knee OA.
- Analysis of molecular mechanisms including metaflammation, mechanoflammation, and mechanotransduction.
- Exploration of diagnostic biomarkers, imaging, and therapeutic strategies.
Main Results:
- Synovitis involves complex molecular pathways contributing to OA structural damage, pain, and progression.
- Current diagnostic methods have limitations, with pain alone being an unreliable marker.
- Precision medicine approaches integrating clinical phenotypes and molecular endotypes show promise for OA care.
Conclusions:
- Personalized management of synovitis-driven knee OA requires integrating molecular insights with clinical phenotypes and endotypes.
- Phenotype- and endotype-informed interventions are crucial for effective and personalized OA treatment.
- Translational research integrating molecular mechanisms and clinical strategies can improve early diagnosis and therapeutic targeting in OA.
