ScienceDaily (Apr. 2, 2009) — A new study finds previously unidentified fibrocartilage-forming progenitor cells in degenerating, diseased human cartilage, but not in cartilage from healthy joints. The research, published in the April 3rd issue of the journal Cell Stem Cell, provides valuable insights into the reparative potential of cartilage and may lead to development of regenerative therapies for arthritis.