The cartilage in the form of meniscus usually does not regrow in the knee joint. Once it is excised it stays short and the body doesn’t have the power of regenerating it. The cartilage lining on the bone, once damaged, also does not regrow back to the normal quality, but the body tries to cover it up with a little inferior quality of the cartilage, which may still be helpful in preventing further damages and decreasing the pain and swelling on the knee.