Objective To evaluate the variation of functional urethra length on urine control

explore a new method to prevent urinary incontinence and seek urodynamic evidence after radical prostatectomy.   Methods Sixteen male dogs

matched in body weight

were randomly divided into two groups. Group A were used to test the different rest urethral pressure profile after resection of prostate

resection of distant prostate plus posterior urethra in length of 1.5 cm and 2.0 cm respectively; Group B to test the different rest urethral pressure profile on pedicle myotube in length of 2.0 cm and 1.0 cm using anterior bladder flap respectively after resection of prostate and posterior urethra in length of 2.0 cm.   Results The urodynamic indexes fell off while the functional urethra length decurtated gradually in group A

but they went up in group B. The two groups showed significant difference before and after the resection of prostate and distant urethra in length of 2.0 cm.   Conclusion There was a direct ratio between the functional urethra length and the capability of urethral urine control. Reconstruction of functional urethra using anterior bladder flap pedicle myotube is a good choice to treat urinary incontinence after radical prostatectomy.