the present invention relates to a prosthetic openwork knit for the treatment of urinary incontinence and / or prolapse , based on an arrangement of yarns of a biocompatible polymer comprising at least one first sheet defining a first chain structure , in which knit said arrangement of yams further comprises at least two non - meshing sheets , of partial weft , the number of chain yarns in said chain structure being from 6 to 12 . the invention also relates to a support implant for the treatment of stress urinary incontinence and / or prolapse obtained from this knit , and to the method of producing such a knit .