Cartilage damage usually causes pain and swelling of the knee which happens specifically in the certain movements which lead to loading of those cartilage. If the cartilage damage is in the patellofemoral joint or on the kneecap, then there is more pain and swelling after moving up and down the stairs. If it is on the inner side of the knee, then there be more pain while doing deep knee bends. It may be associated with clicking and popping of the joint and occasional feeling of giving way.