Intra-Articular Therapeutics for Knee Osteoarthritis
Summary
Knee osteoarthritis is characterised by progressive degeneration of articular cartilage, subchondral bone changes and synovial inflammation, leading to pain, stiffness and mobility impairment. Intra-articular therapies aim to deliver agents directly into the joint space, maximising local effects while minimising systemic exposure. Established modalities include corticosteroids for rapid anti-inflammatory relief and hyaluronic acid formulations to restore the viscoelastic properties of synovial fluid. Emerging biologic approaches draw on blood-derived products such as platelet-rich plasma, and perinatal tissues including Wharton’s jelly to harness growth factors, cytokines and extracellular vesicles. Mesenchymal stem cells and engineered scaffolds seek to promote cartilage repair and potentially modify disease progression. Attention to formulation attributes—molecular weight, cross-linking and antioxidant stabilisers—has underpinned recent advances in viscosupplementation. The global burden of knee osteoarthritis and the limitations of current non-surgical treatments have spurred intensive research into novel intra-articular strategies that combine symptom relief with structural preservation.
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Intra-Articular Therapeutics for Knee Osteoarthritis publication trend
The graph below shows the total number of articles in intra-articular therapeutics for knee osteoarthritis across all publications each year (not limited to Nature Index journals).
Technical terms
Intra-articular injection: direct delivery of therapeutic agents into the joint cavity to target local pathology.
Hyaluronic acid: a naturally occurring glycosaminoglycan responsible for the viscoelasticity and lubrication of synovial fluid.
Viscosupplementation: the injection of viscoelastic substances, most commonly hyaluronic acid, to restore normal joint fluid properties.
Mesenchymal stem cells: multipotent progenitor cells capable of modulating inflammation and supporting tissue regeneration.
Synovial fluid: viscous liquid within the joint space that facilitates lubrication, shock absorption and nutrient distribution to cartilage.
Proteoglycan: macromolecules in cartilage extracellular matrix that retain water and contribute to its load-bearing resilience.
References
- Wharton’s jelly and osteoarthritis of the knee. British Medical Bulletin (2023).
- Hyaluronic Acid in Rheumatology. Pharmaceutics (2023).
- Ex Vivo Functional Benchmarking of Hyaluronan-Based Osteoarthritis Viscosupplement Products: Comprehensive Assessment of Rheological, Lubricative, Adhesive, and Stability Attributes. Gels (2023).
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