The sacroiliac joints, also known as SI joints, are the two largest joints found within your pelvis and lower back. They are long joints that bear much of your body weight and move with every step you take. Because of their role in your body’s structure and motion; they are prone to becoming contributors to hip and low back pain. As a chiropractor, I have seen countless patients with sacroiliac pain in Fort Collins. If you are alive and like to have fun, chances are you have injured a SI joint more than once.