EDITORIAL … more bricks to the building of cartilage knowledge?

This issue of the KSSTA journal contains a spicy basket of papers on cartilage repair and related problems. When I was asked to give an editorial about those papers, I used a nice sunny summer morning of one of my remaining vacation days to read them. It was a nice reading and I got new information useful for my practice. It is more than 20 years ago since our group in Gothenburg performed the first autologous chondrocyte implantation [1], the first generation ACI. Today, we have reached the third gener-ation ACI with different scaffolds and cell-seeded carriers, but still we are only in the very beginning of knowing the secrets of cartilage and cartilage repair mechanisms. We need both experimental and clinical research contributing with bricks of knowledge of how and when to do our surgery, which lesions that need to be treated and traumati