Femoroacetabular impingement is a relatively recently recognised condition in which excessive bone growth at the front of the femoral neck interferes with the normal movement of the hip joint and causes pain.

The "bump" impinges on the front edge of the socket damaging the labrum and articular cartilage. It is thought that some cases of hip arthritis start in this way. Patients describe a sharp catching pain in the groin when the hip is flexed deeply, such as when sitting or during exercise.

Treatment consists of an initial hip arthroscopy to assess the degree of damage to the articular cartilage and labrum and clean up any damaged areas. Whilst it may be possible to remove the "bump" at hip arthroscopy, it may be necessary later to perform an open operation on the hip to remove larger bumps or to reattach a damaged labrum.