The treatment of articular chondral defects of your knee has classically been complicated, due to cartilage's aneural, avascular and alymphatic nature. This makes purely natural therapeutic of chondral defects nearly impossible.  (OCD), a condition in which a bit from the cartilage along with the layer of bone beneath have died. https://www.theorthopaedicandpainpractice.com/what-are-cartilage-lesions/