Figure 1
From: Fluoroscopic views for safe insertion of lag screws into the posterior column of the acetabulum
On the axial computed tomography (CT) image at the middle height level of the acetabulum, Line A represents the posterior cortex of the posterior column. The angle between Line A and the line intersecting the axial plane and the coronal plane is labelled angel α. Line B represents the medial wall of the acetabulum. The angle between Line B and the line intersecting the axial plane and the sagittal plane is labelled angle β.