The concentration of hyaluronic acid (HA) and proteins in synovial fluids of hip and shoulder joints of a variety of canine breeds has been investigated. In the Australian Kelpie, a working dog with a low incidence of hip dysplasia, shoulder synovial fluid viscosity and HA concentration were higher than in similar joints of Alsatians in which hip dysplasia is relatively common. Moreover, the HA levels and viscosity in shoulder fluids of animals with clinically defined hip dysplasia were substantially lower than in all other breeds studied. On the basis of these findings, we propose that hip dysplasia and other joint abnormalities may arise as a consequence of a deficiency in the levels of HA in synovial fluids.
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