Fig. 4A–C.

The region of resection shown on the mean native cam shape was determined based on overall shape variation between patients with cam FAI and screened control subjects. The region was located primarily in the anterolateral head-neck junction, spanning 71°, 93°, and 138° in the (A) axial, (B) coronal, and (C) sagittal planes, respectively. The angle was measured clockwise from lateral in the superior view and from superior in the anterior and lateral views. The greater trochanter has been removed in the sagittal view to better observe the extent of the resection.