Figure 1: The two scaffold types used as carrier for chondrocyte transplantation in this project showing very different structure and cell distribution. A) A dense collagen type I/III fleece consisting of collagen fibres of various thickness. Most of the chondrocytes are on the seeding surface of the material forming a cellmultilayer (asterisk). B) Loose hyaluronan web of three-dimensionally arranged scaffold fibres with regular thickness. The cells are distributed uniformly between the large interfibre spaces (arrow). Scale bars: (A,B) 100 µm. (For further description see Nürnberger et al. [6]).