Synovial changes in osteoarthritis: symptom or disease driver?

Area of Science:

• Rheumatology
• Orthopedics
• Immunology

Background:

• Osteoarthritis (OA) is increasingly viewed as a complex joint disease, not solely cartilage degeneration.
• The synovium, a key joint tissue, plays a critical role in OA pathogenesis.

Purpose of the Study:

• To review evidence supporting the synovium's active role in OA progression.
• To highlight pathological synovial changes and their contribution to joint degeneration.
• To underscore the therapeutic potential of targeting the synovium in OA.

Main Methods:

• Review of current scientific literature on synovial involvement in OA.
• Analysis of physiological and pathological processes within the synovium.
• Examination of clinical and preclinical data linking synovitis to OA outcomes.

Main Results:

• Synovial changes like hyperplasia, immune cell infiltration, and fibroblast activation actively drive OA.
• Fibroblast-like synoviocytes and macrophages initiate inflammatory cascades impacting cartilage and joint fluid.
• Synovitis and synovial damage correlate with OA progression and pain.

Conclusions:

• The synovium is a central driver of osteoarthritis pathogenesis.
• Targeting synovial inflammation and remodeling presents a promising therapeutic strategy for OA.
• Overcoming therapeutic challenges requires innovative research, diagnostics, and collaboration.