Inclusion Criteria:  18 years of age or older severe fecal incontinence characterized by at least one episode of weekly fecal incontinence failed rehabilitation and dietary management strategies who have failed/contraindicated/refused sacral root neuromodulation (in the indication of fecal incontinence) having, for women of childbearing age, effective contraception throughout the study having given free, informed and written consent  Exclusion Criteria:  unable or unwilling to undergo follow-up or symptomatic evaluation contraindication to general anesthesia contraindication to metronidazole (hypersensitivity and wheat allergy) significant pelvic static disorder active anal suppuration anal stenosis externalized rectal prolapse chronic inflammatory bowel disease (Crohn's disease, ulcerative colitis) on anticoagulants or antiaggregants history of anal or rectal neoplasia coagulation anomaly, curative anticoagulation history of rectal surgery history of pelvic radiotherapy previous treatment with inert materials (hyaluronic acid, biosilicones, coaptitis) in the 5 years preceding inclusion allergy to lidocaine or contraindication to adrenaline protected person (adult subject to legal protection (safeguard of justice, curatorship, guardianship), person deprived of liberty, pregnant or breast-feeding woman, minor) participating in another interventional trial concurrently not covered by a social security system