Treatment of stress urinary incontinence--midurethral slings: top-down, bottom-up, "outside-in," or "inside-out".

Two randomized trials have reported no differences in efficacy between suprapubic arc and tension-free vaginal tape at 2 years. There are no long-term studies comparing the inside-out and outside-in transobturator (TOT) approach, although short-term data show no difference in cure rates or complications. The short-term efficacy of TOT midurethral slings is comparable with the retropubic slings; however, preliminary evidence suggests that TOT slings may have a lower success rate compared with retropubic slings for the treatment of intrinsic sphincter deficiency. The risk of bladder injury may be the least with the "inside-out" approach, whereas retropubic techniques have a higher risk of cystotomy as compared with the TOT approach. Four randomized controlled trials comparing the retropubic and TOT approaches show no differences in rate of de novo urgency, retention, frequency, nocturia, or incomplete voiding.