To answer the research question, we will include 66-86 women with FI after OASIS. Sphincter defects are classified using three dimensional endoanal ultrasonography. Pelvic floor function including FI is registered using validated questionnaires. All women eligible for inclusion is PNE-tested for three weeks. The purpose of this cohort analysis, is to examine the possible effect of SNM in women with sphincter defects, and the hypothesis is that there is no relation between sphincter defect classified using tree dimensional ultrasound and efficacy of SNM.