FAI refers to femoroacetabular impingement.
Femoroacetabular impingement (FAI) is a condition in which the normal range of motion of the ball and socket is compromised. This could be because the ball’s apex is not perfectly spherical or because the cavity is quite deep. It is not fully understood why this occurs, and in the majority of cases, no special treatment is necessary. In a few cases, surgery may increase the range of motion in the hip, but it is unclear whether this helps prevent the development of arthritis over time.
If scans and x-rays of the hip joint are normal, their symptoms may result in referred back discomfort. You may only experience pain in your buttocks, down the back of your legs by the outer side of your hip joint, and primarily in the front of your hip if you have a problem with your lower back.
