3Shakoor MA,Rahman MS,Azad AK,et al.Effects of isometric quadriceps muscle strengthening exercise on chronic osteoarthritis of the knee [ J ] .Bangladesh Med Res Counc Bu11,2010,36 ( 1 ) :20-22.
4Hardingham T.Extracellular matrix and pathogenic mechanisms in osteoarthritis [ J ] .Current rheumatolo- gy.reports,2008,10 ( 1 ) :30-36.