Clough, Geraldine (2008) Bend those knees! Journal of Physiology, 586 (6), p.1462. (doi:10.1113/jphysiol.2008.151464).
Abstract
Our evolutionary success as vertebrates has been in large part due to the development and positioning of the synovial joint, sitting as it does between our long bones, to enable us to move smoothly. Synovial fluid, the visco-elastic material filling the joint cavity, serves not only as a lubricant and a shock absorber but is also an important source of nutrients for the joint cartilage (Fam et al. 2007). One of the major components of synovial fluid and central to its rheological and other properties is the glycosaminoglycan, hyaluronic acid (HA). HA, composed of repeated disaccharide units of N-acetylglucosamine and d-glucuronic acid, has an average molecular mass of 1 × 106 Da. Its concentration in human synovial fluid is between 2 and 4 mg ml?1.
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