Postoperative anteroposterior radiograph of the pelvis showing an anatomic reduction (asterix) of the acetabular fracture (incomplete anterior column posterior hemitransverse) with break-out of the quadrilateral plate and impaction at the acetabular roof in a 79-year-old male patient. To enhance the fixation strength, an infra-acetabular screw (black arrow) was applied with the teardrop being the isthmus of the screw