I know they say it is caused by all these general things such as age, genes, and wearing of the cartilage, but what is the scientific method of it? What is happening inside the body that specifically causes the deterioration of the cartilage. If the body can keep cartilage healthy and lubricated in most people for their entire life, what is different about the people with arthritis? I have been doing countless hours of research on this, and I have yet to find an peer reviewed article that mentions anything about the cellular research of arthritis.