Abstract
Hyaluronan (HYA) (Laurent et al. 1992) is a linear extracellular polysaccharide found in all tissues and body fluids but in highest concentrations in loose connective tissue. It is present in synovial fluid, where it is responsible for the unique rheological properties, in cartilage, where it forms the backbone of the proteoglycan aggregates and in the synovial tissue and joint capsule. HYA is also present in muscular tissues between the muscle bundles.