[Impaired statics of bladder and urethra in some lower motor neurobladders and its treatment by colocystopexia (author's transl)].

In spite of sphincter paralysis, the peripheric moto-neurone lesions induces bladder retention. Secondary retention forces fail to open the bladder neck owing to detrusor flaccidity. Long-dated, abdominal straining increases this static dysfunction by inducing posterior bladder prolapsus upon a flaccid perineum. This disorder est characterized by three components: --posterior prolapsus of the bladder, --horizontal position of the proximal urethra, --deepening of Douglas peritoneum. These patients may get a micturation using a perineal compression; similarly, surgical management consists in a making-up and fastening of the bladder by means of the rectum which is used as a hammack (colocystopexia). The procedure had been used in five cases with good results.