Ischiofemoral impingement is when we have a touching or a closeness of the bones of the ischium, which is part of the pelvis, it’s your sit bone, and the, what we call the lesser trochanter on the femur bone, or part of the hip bone. And sometimes in some people, this space here gets very narrow, and there are muscles and nerves and tendons that sit in this area. And those can get pinched and that can be pretty painful. So one of the things we do to correct that is on the femur side especially, we can shave down this extra bone here, and make it smaller, then allowing for more space in that area and getting rid of the ischiofemoral impingement.