 The AP pelvic radiograph of a 26 years old female patient with bilateral general acetabular overgrowth and subsequent pincer type FAI is shown. The femoral head crosses the ilio-ischial line on both sides indicating acetabular protrusion. This is represented by an increased lateral center edge angle (LCE) >40°, a negative acetabular index (AI) and a decreased extrusion index (EI) <16%.