Since cartilage does not contain any blood vessels, diffusion is the most important transport mechanism for its supply. Although several methods are available for the measurement of diffusion, this study focuses exclusively on NMR methods. Besides the "classic" water diffusion, the diffusion behaviour of ions and polymers in cartilage is also described. In all cases, and at short observation times, diffusion is mostly determined by the water content of the sample. However, the variation of the observation time allows to obtain information also on the internal structure of cartilage. In addition, it is discussed to which extent the individual techniques allow conclusions with respect to degenerative joint diseases, and under which in vivo conditions they can be applied.