Currently, two approaches are available for the placement of a suburethral sling: retropubic approach (TVT) and trans-obturator approach (TVT-O). The efficacy of these two approaches seem equivalents. However, the morbidity related to these two techniques is probably different. In retrospective studies, the retropubic approach is associated with a higher rate of bladder perforation. On the other hand, the trans-obturator approach is supposed to be associated with a higher rate of post-operative pain.