Lab Grows Cartilage

Tissue engineering can effectively fix damaged knee cartilage, researchers have shown for the first time. Cartilage cells donated by patients were grown on scaffolds in the lab before being implanted back into their knees. More than a year later analysis showed the cartilage had matured successfully, even in patients with osteoarthritis.
http://www.newscientist.com/article/dn9483-labgrown-cartilage-fixes-damaged-knees.html