Fig. 1

Anterior abdominal wall in cross section above the arcuate line. The mesh (black dashed lines) may be anterior to the abdominal wall fascia (Onlay), be adjacent to the fascial edges (Inlay), in the preperitoneal space between the fascia and the peritoneum (Properitoneal underlay), or be attached to the peritoneum in an intraperitoneal position (Intraperitoneal underlay)