Your sacroiliac joints (we call them the “SI” joints) are the places where your hips meet your spine. These joints don’t have a lot of flexibility, but they do move slightly as you move your body. If SI joints become damaged or diseased, it can be painful. SI joints hurt when the tiny nerves in the joints become irritated, due to injury or arthritis, or if the supporting ligaments become irritated. SI joint pain begins in the low back and buttocks and can radiate into the hip, groin and thigh on one or both sides of the body. A variety of treatment options are available.