A, “Beta view” for measurement of the beta angle with the hip in 90 degrees of flexion, 20 degrees of abduction, and 0 degrees of rotation. X-ray beam is angled 15 degrees to the anteroposterior direction so that it is tangential to the acetabular plane. Beta-view radiographs showing (B) cam-type femoroacetabular impingement with a reduced beta angle of 8.5 degrees and (C) a healthy control subject with a more normal beta angle of 55.2 degrees.