Inclusion Criteria:  Age 18 - 90 years, undergoing sphinkeeper operation at the Department of General Surgery, Medical University of Vienna Ability and willingness to understand and comply with study interventions and restrictions. Voluntarily signed informed consent after full explanation of the study to the participant  Exclusion Criteria:  Any physical or mental disorder, which could interfere with the participant's safety during the clinical trial or with the study objectives Inability to communicate well with the investigator due to language problems or reduced mental development Inability or unwillingness to give written informed consent