The management of moderate urinary incontinence after radical prostatectomy may require the use of an artificial sphincter, which remains the reference technique although it requires implantation of material, sometimes involving redo operations. Submucosal macroplastique injections have been proposed, but the results do not appear to be maintained over time. Cell therapy, consisting of the injection of stem cells into or close to the sphincter, probably represents the approach of the future, but in 2006, studies were still only at the evaluation phase.