Article information Background: Urinary incontinence [UI] is any urinary leak. It is a common and stressful health condition, which have an impact on patient's quality of life. It is more prevalent among women than men [2:1]. Risk factors include pregnancy, parturition, and menopause. The aim of the work: The work study aimed to assess the value of urodynamics prior to stress incontinence surgery [SUI] with regard to outcome, as well as the costs, in women complaining from SUI. Patients and Methods: This study carried out at the department of Obstetrics and Gynecology, Al-Azhar University Hospital [Assiut Branch]. It included 20 females, 30-40 years old, who were suffering from SUI free from any medical diseases or previous surgeries of urinary tract. All were submitted to urodynamic study before surgical correction by anterior colpourethroraphy [El Hemaly operation] and outcome was documented. Results: The results of filling phase revealed that, the infused and bladder filling were significantly increased, while volume lost through leakage was significantly reduced after intervention than corresponding values before surgery [514.3±155.29, 473.2±174.89 and 55.8±50.96 vs 359.3±193, 238.25±142.59 and 120±68.17, respectively]. Sensation results revealed that, there was statistically significant increase of volume at first sensations, first desire, normal desire, strong desire, urgency and maximum cystometric capacity, when compared to volumes before surgery. Conclusion: Anterior colpourethroraphy [El-Hemaly operation] was an effective option, technically feasible with low complications and consistent patient satisfaction. Urodynamic study remains the most comprehensive method in the assessment of the bladder and urethral function.