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Osteoarthritis (OA) represents a group of chronic, painful, disabling conditions affecting synovial joints. It is characterized by degeneration of articular cartilage, alterations of peri-articular and subchondral bone, low-grade synovial inflammation (synovitis). Despite OA is commonly described as a non-inflammatory disease, it is known that its progression and the subsequent increment of symptoms correlate to the production of inflammatory factors that induce the secretion of enzymes responsible for cartilage degradation. In clinical practice, to alleviate pain and stiffness, not only during acute phases but also as maintenance therapy, intra-articular injections of corticosteroids or similar drugs are used, besides it is well diffused the viscosupplementation procedure based on hyaluronan gel. There are many different products containing high molecular weight linear HA or cross-linked derivatives, however the novelty in the field consist in the hybrid cooperative complexes derived from high and low molecular weight HA through a patented processing. This technique permit to double the amount of HA delivered to the injured site without increasing the injected volume, beside in vitro assay on human chondrocytes suggested hybrid complexes as effective in the modulation of several inflammatory cytokines in joints.

clinical cases in mineral and bone metabolism

Hyaluronan viscosupplementation: state of the art and insight into the novel cooperative hybrid complexes based on high and low molecular weight HA of potential interest in osteoarthritis treatment