Do study the below if you have cartilage damage!
Richard Bedard. (16 Jun 2011). Knee Cartilage Repair: How One Patient Proved His Doctors Wrong. http://www.huffingtonpost.com/richard-bedard/knee-cartilage-repair_b_876946.html. The Huffington Post (US Edition).
Sara Wykes. (5 Sep 2014). Researchers take up challenge of reviving cartilage. https://med.stanford.edu/news/all-news/2014/09/researchers-take-up-challenge-of-reviving-cartilage.html. Stanford Medicine News Center.
Do also consider the earlier post on joint pains here.