Stephen Hawking: 'There is no heaven; it's a fairy story'. In an exclusive interview with the Guardian, the cosmologist shares his thoughts on death, M-theory, human purpose and our chance existence. , science correspondent. Sunday 15 May 2011 17.00 EDT First published on Sunday 15 May 2011 17.00 EDT.
Both the growth of a tumor and the repair of a scrape on the knee are similar because they involve a mass amount of blood cells in a particular area. A growth of a tumor is a huge mass of cells that form together an cause it. And like the forming tumor, when you get a scrape on your knee blood cells are clumped together forming a large mass of blood also. They are different because there isn't an opening to a tumor allowing blood cells to flow out. When there is a scrape on your knee, there is an opening/cut, allowing blood cells to flow out properly.
With the microfracture, the study found evidence of fibrous repair tissue and incomplete healing. Researchers concluded that the reason for the superior results from the paste graft was the presence of stem cells in the paste. The DNA in the stem cells makes more normal looking, smooth, cartilage repair tissue.The research noted a synergistic interaction of the stem cells with the cartilage matrix and the cells of the cartilage (chondrocytes) that exceeded what might have been expected from cells alone.n articular cartilage paste graft is an arthroscopic, out-patient, single-step procedure in which a small amount of the patientâs own bone, stem cells, and cartilage is taken out of the non-weight bearing intercondylar notch of the knee, ground into a paste, and impacted back into an arthritic defect in the joint.