 This study evaluates the effectiveness of mesenchymal stem cells in treatment of stress urinary incontinence due to intrinsic sphincter deficiency; in which the problem is weakness or damage of the sphincter muscle responsible for continence. Mesenchymal stem cells are undifferentiated cells which can undergo self-renewal differentiation into other cell types like muscle cells; thus can be used to regenerate the damaged sphincter muscles. In this study mesenchymal stem cells will be obtained from bone marrow from the patient, processed, then re-injected periurethrally. Effectiveness will be compared to that of the surgical treatment tension-free vaginal tape. 