FIGURE 5: Placement of anterior to posterior screws through a plate for fixation of a transverse fracture exposed through an ilioinguinal approach. Screws placed closer to the ischial spine are less likely to result in inadvertent intra-articular placement (see inset). The margin for error in placement of screws in the quadrilateral surface medial to the acetabulum is small.

Orthopaedic Knowledge Update: Trauma, Chapter 26, pp. 253-261