Hip 5908 Femoroacetabular Impingement (FAI) Femoroacetabular impingement (FAI) is a condition where the bones of the hip are abnormally shaped. Because they do not fit together perfectly, the hip bones rub against each other and cause damage to the joint. 1882 Labral Tears The cause of a labral tear may be degenerative or traumatic. Degenerative tears occur after years of repetitive minor injuries and are usually associated with arthritis of the hip. 1657 Arthroscopy Arthroscopy is a surgical procedure that gives doctors a clear view of the inside of a joint. This helps them diagnose and treat joint problems. Share this page!