STARR Trans-anal Resection Versus Vaginal Rectocele Repair Using Elevate: Effects on Defecatory Function

Inclusion Criteria: * patient is not under any type of guardianship * patient has a rectocele \> 3 cm during defecography * patient has persistent defecatory troubles depite medical treatment (laxatives for at least 1 month) and an ODS score \> 10 * patient recieved information and signed the consent form Exclusion Criteria: * patient cannot read French * patient has an asymptomatic rectocele * patient with an enterocele at rest upon defecography, with opacification of the small bowel * patient with non-rehabilitated anorectal asynchrony (anism) * patient with anal incontinence, Wexner score \> 7 * patient has a rectal lesion * patient has previously had rectal surgery including a colorectal anastomosis * patient has previously had a surgery involving disection of the rectovaginal wall, except for myorraphy of relever muscles * patient has previously had pelvic radiotherapy * anal sphincter insufficiency detected by rectomanometry * megarectum detected by rectomanometry and defecography * granule transit anomaly: \> 70h * exteriorized rectal prolapse * rectovaginal fistule * intestinal inflammatory disease * anal stenosis * anal or rectal tumor * patient refuses to participate or refuses to sign consent * patient is enrolled in another study * contra indication for general or localized anesthesia * patient does not have social security coverage