Urinary incontinence has been shown to affect up to 50% of women. Studies in the USA
have shown that up to 80% of these women have an element of stress urinary incontinence.
This imposes significant health and economic burden on society and the women affected.
Colposuspension and now mid‐urethral slings have been shown to be effective in treating
patients with stress incontinence. However, associated adverse events include bladder
and bowel injury, groin pain and haematoma formation. This has led to the development
of third‐generation single‐incision slings, also referred to as mini‐slings. It should
be noted that TVT‐Secur (Gynecare, Bridgewater, NJ, USA) is one type of single‐incision
sling; it has been withdrawn from the market because of poor results. However, it
is one of the most widely studied single‐incision slings and was used in several of
the trials included in this review. Despite its withdrawal from clinical use, it was
decided that data pertaining to this sling should be included in the first iteration
of this review, so that level 1a data are available in the literature to confirm its
lack of efficacy. To assess the effectiveness of mini‐sling procedures in women with
urodynamic clinical stress or mixed urinary incontinence in terms of improved continence
status, quality of life or adverse events. We searched: Cochrane Incontinence Specialised
Register (includes: CENTRAL, MEDLINE, MEDLINE In‐Process) (searched 6 February 2013);
ClinicalTrials.gov, WHO ICTRP (searched 20 September 2012); reference lists. Randomised
or quasi‐randomised controlled trials in women with urodynamic stress incontinence,
symptoms of stress incontinence or stress‐predominant mixed urinary incontinence,
in which at least one trial arm involves one of the new single‐incision slings. The
definition of a single‐incision sling is “a sling that does not involve either a retropubic
or transobturator passage of the tape or trocar and involves only a single vaginal
incision (i.e. no exit wounds in the groin or lower abdomen).” Three review authors
assessed the methodological quality of potentially eligible trials and independently
extracted data from individual trials. We identified 31 trials involving 3290 women.
Some methodological flaws were observed in some trials; a summary of these is given
in the 'Risk of bias in included studies' section. No studies compared single‐incision
slings versus no treatment, conservative treatment, colposuspension, laparoscopic
procedures or traditional sub‐urethral slings. No data on the comparison of single‐incision
slings versus retropubic mid‐urethral slings (top‐down approach) were available, but
the review authors believe this did not affect the overall comparison versus retropubic
mid‐urethral slings. Types of single‐incision slings included in this review: TVT‐Secur
(Gynecare); MiniArc (American Medical Systems, Minnetonka, USA); Ajust (CR Bard Inc.,
Covington, USA); Needleless (Mayumana Healthcare, Lisse, The Netherlands); Ophira
(Promedon, Cordoba, Argentina); Tissue Fixation System (TFS PTY Ltd, Sydney, Australia)
and CureMesh (DMed Co. Inc., Seoul, Korea). Women were more likely to remain incontinent
after surgery with single‐incision slings than with retropubic slings such as tension‐free
vaginal tape (TVT TM ) (121/292, 41% vs 72/281, 26%; risk ratio (RR) 2.08, 95% confidence
interval (CI) 1.04 to 4.14). Duration of the operation was slightly shorter for single‐incision
slings but with higher risk of de novo urgency (RR 2.39, 95% CI 1.25 to 4.56). Four
of five studies in the comparison included TVT‐Secur as the single‐incision sling.
Single‐incision slings resulted in higher incontinence rates compared with inside‐out
transobturator slings (30% vs 11%; RR 2.55, 95% CI 1.93 to 3.36). The adverse event
profile was significantly worse, specifically consisting of higher risks of vaginal
mesh exposure (RR 3.75, 95% CI 1.42 to 9.86), bladder/urethral erosion (RR 17.79,
95% CI 1.06 to 298.88) and operative blood loss (mean difference 18.79, 95% CI 3.70
to 33.88). Postoperative pain was less common with single‐incision slings (RR 0.29,
95% CI 0.20 to 0.43), and rates of long‐term pain or discomfort were marginally lower,
but the clinical significance of these differences is questionable. Most of these
findings were derived from the trials involving TVT‐Secur: Excluding the other trials
showed that high risk of incontinence was principally associated with use of this
device (RR 2.65, 95% CI 1.98 to 3.54). It has been withdrawn from clinical use. Evidence
was insufficient to reveal a difference in incontinence rates with other single‐incision
slings compared with inside‐out or outside‐in transobturator slings. Duration of the
operation was marginally shorter for single‐incision slings compared with transobturator
slings, but only by approximately two minutes and with significant heterogeneity in
the comparison. Risks of postoperative and long‐term groin/thigh pain were slightly
lower with single‐incision slings, but overall evidence was insufficient to suggest
a significant difference in the adverse event profile for single‐incision slings compared
with transobturator slings. Evidence was also insufficient to permit a meaningful
sensitivity analysis of the other single‐incision slings compared with transobturator
slings, as all confidence intervals were wide. The only significant differences were
observed in rates of postoperative and long‐term pain, and in duration of the operation,
which marginally favoured single‐incision slings. Overall results show that TVT‐Secur
is considerably inferior to retropubic and inside‐out transobturator slings, but additional
evidence is required to allow any reasonable comparison of other single‐incision slings
versus transobturator slings. When one single‐incision sling was compared with another,
evidence was insufficient to suggest a significant difference between any of the slings
in any of the comparisons made. TVT‐Secur is inferior to standard mid‐urethral slings
for the treatment of women with stress incontinence and has already been withdrawn
from clinical use. Not enough evidence has been found on other single‐incision slings
compared with retropubic or transobturator slings to allow reliable comparisons. A
brief economic commentary (BEC) identified two studies which reported no difference
in clinical outcomes between single‐incision slings and transobturator mid‐urethral
slings, but single‐incision slings may be more cost‐effective than transobturator
mid‐urethral slings based on one‐year follow‐up. Additional adequately powered and
high‐quality trials with longer‐term follow‐up are required. Trials should clearly
describe the fixation mechanism of these single‐incisions slings: It is apparent that,
although clubbed together as a single group, a significant difference in fixation
mechanisms may influence outcomes. Stress urinary incontinence (leakage of urine on
effort or exertion, or on coughing, sneezing or laughing) is a common condition that
affects up to one in three women worldwide. It is usually the result of weakening
of the muscular support of the pipe that conducts urine (urethra), or weakening of
the sphincter (circular) muscle at the base of the bladder, which maintains continence.
It is more common in women who have had children by vaginal delivery and in those
who have weakness in the pelvic floor muscles for other reasons. A significant amount
of the woman's and her family's income can be spent on managing the symptoms. Historically
many types of surgery have been performed to treat women with stress urinary incontinence.
Over the past 10 years, the accepted standard technique has been the mid‐urethral
sling operation, whereby an artificial tape or mesh is placed directly beneath the
urethra and is anchored to the tissues in adjacent parts of the groin or just above
the pubic bone. Examples of such slings that are commonly used are tension‐free vaginal
tape (TVT TM ) and transobturator tape (TOT). These operations are usually quite successful,
with success rates approaching 80% or 90%. However, they have been shown to result
in significant side effects, which can be bothersome and sometimes even dangerous,
such as damage to the bladder caused by tape insertion, erosion of the tape into the
urethra during the healing period or chronic thigh/groin pain. In an effort to maintain
efficacy while eliminating some of the side effects, a new generation of slings has
been developed, called 'single‐incision slings' or 'mini‐slings'; these slings are
the subject of this review. They are designed to be shorter (in length) than standard
mid‐urethral slings and do not penetrate the tissues as deeply as standard slings.
It was therefore thought that they would cause fewer side effects while being no less
effective. Examples of single‐incision slings include TVT‐Secur, MiniArc, Ajust and
Needleless slings, among others. We looked for all trials that allocated participants
at random to single‐incision slings versus any other treatment for stress incontinence
in women, especially comparisons with mid‐urethral slings. We identified a total of
31 trials, involving 3290 women, all of which compared a type of single‐incision sling
versus a type of mid‐urethral sling, or different types of single‐incision slings
against each other. Overall the quality of the trials was moderate. We found that
subtle differences in the way individual mini‐slings work have sometimes made comparisons
difficult. TVT‐Secur is a specific type of mini‐sling that has consistently been shown
to provide poorer control of incontinence, along with higher rates of side effects,
compared with standard mid‐urethral slings. It has already been withdrawn from clinical
use. In terms of costs, a non‐systematic review of economic studies suggested that
single‐incision slings are cheaper than mid‐urethral slings. However, no clear evidence
was presented on the differences in costs and effects. As most trials currently available
for inclusion in this review assess TVT‐Secur, trials comparing other single‐incision
slings versus standard mid‐urethral slings were too few to allow meaningful comparisons.
Some evidence suggests that single‐incision slings were quicker to perform and may
cause less postoperative pain, but more trials are needed to adequately assess whether
the other types of mini‐slings are in fact as good as or safer than standard mid‐urethral
slings.