Protrusion of prosthetic meshes in repair of inguinal hernias

Background. Although techniques with prosthetic meshes have improved results of inguinal hernia repair, the problem of recurrence remains. In addition to patient- and surgeon-related causes, Protrusion of prosthetic mesh through the hernia defect can be considered as a factor of recurrence. Methods. To simulate inguinal hernia, porcine tissue with standardized defects (, 4, and 5 cm) was used. Nine different meshes (9 cm diameter) were positioned on the defects. In a pressure chamber the depth of protrusion through the defect was assessed. Both sides of each mesh were measured. Protrusion at a pressure representing Valsalva pressure was used for statistical analysis. Results. Protrusion, including the incidence of collapse, increased with larger defect sizes. Significant protrusion differences were found between different meshes and occasionally between the 2 sides of the same mesh. Conclusions. The differences between the effects of the various meshes emphasize the importance of material characteristics when developing new surgical techniques. The 3 meshes showing least protrusion are considered especially suitable when repairing large defects or when preferring a small mesh when repairing inguinal hernias with a preperitoneal sublay approach.