Decreased birefringence of the superficial zone collagen network in the canine knee (stifle) articular cartilage after long distance running training, detected by quantitative polarised light microscopy. - Arokoski,J.P.; Hyttinen,M.M.; Lapveteläinen,T.; Takacs,P.; Kosztaczky,B.; Modis,L.; Kovanen,V.; Helminen,H.J. (Ann Rheum Dis, 1996)