Rheumatoid Arthritis: This autoimmune ailment also can have an affect on the knees, creating inflammation and damage to joint cartilage. This really is an autoimmune sickness that causes the tissue throughout the joint to become inflamed and thickened. In the long term, this could damage and reduce the knee cartilage. https://www.theorthopaedicandpainpractice.com/knee-pain-in-older-patients-ages-55/