I just injured my knee and watched videos online about knee injuries. A holistic chiropractor said cortisone and NSAIDs destroy cartilage. He also said if you really had bone on bone, you can't walk and that cartilage can be regrown. He said to put 5 to 8 pound ankle weights on and swing your feet back and forth gently. Pulling the knee joint apart helps improve circulation and this better gets nutrients to the joint.