The Potential Role of Synovial T Cell Infiltration Following Knee Joint Injury in Symptoms and Progression to Osteoarthritis
Authors' conclusion
We identify a hitherto unappreciated pathophysiologic role of acute T cell activation after joint injury in long-term posttraumatic OA risk
Study context
- Population
- Mice after sham or destabilization of the medial meniscus (DMM) surgery; patients with meniscal injury and osteoarthritis (OA)
- Comparison
- DMM vs sham surgery in mice; patients with meniscal injury and OA
Methodological detailsmouse DMM model with sham control, temporal flow cytometric and messenger RNA (mRNA) expression analysis, human synovial tissue comparison, T cell depletion experiments
- Mouse DMM model with sham control
- Temporal flow cytometric and mRNA expression analysis
- Human synovial tissue comparison
- T cell depletion experiments
Main finding
As reported in the abstract
- Synovial monocyte/macrophage number, activation and polarization identical after DMM and sham
- Synovial (not splenic or peripheral blood) CD4+ and CD8+ lymphocyte number and activation increased from 1 day after DMM vs sham, with persistent cyclical elevation throughout OA onset and progression
- Temporal imbalance in synovial Th17/Treg and Th1/Th2 lymphocytes during DMM-induced OA initiation and progression
- Early postinjury and late OA CD3/CD8 T cell responses confirmed in patients' synovial tissues; CD8 associated with early postinjury symptoms
- Significant role for CD3+ T cells in synovial metalloproteinase secretion
- Anti-CD3 depletion in mice: preliminary evidence that early postinjury T cell responses may be associated with long-term OA pathology
Original publication
The Potential Role of Synovial T Cell Infiltration Following Knee Joint Injury in Symptoms and Progression to Osteoarthritis. Arthritis Rheumatol. Published 1 May 2026. doi:10.
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