Why Am I Still Leaking After Bladder Sling Surgery?

Persistent leaking after bladder sling surgery happens more often than most people expect, with failure rates ranging from roughly 8% to over 50% within five years depending on how “failure” is defined and which patients are studied.¹ The reasons span a surprisingly wide range, from the sling being positioned slightly off to your bladder developing entirely new behaviors after the operation. Understanding which type of leaking you’re dealing with is the first step toward figuring out what to do about it.

The Type of Leak Changes Everything

Before surgery, you likely had stress urinary incontinence, the kind where you leak during a cough, sneeze, laugh, or exercise. Sling surgery is designed to fix that specific problem by supporting the urethra so it stays closed under physical pressure. But after surgery, the leaking you’re experiencing may not be the same kind you had before. This distinction matters enormously because the causes and treatments are completely different.

If you’re still leaking with coughs and sneezes, the stress incontinence component wasn’t fully corrected. That points toward issues with the sling itself or the underlying anatomy. But if you’re experiencing sudden, hard-to-control urges to urinate and sometimes not making it to the bathroom in time, that’s urgency incontinence, which can be a separate condition that sling surgery was never designed to fix. Many women have a mix of both, which is called mixed incontinence, and the urgency component can become more noticeable once the stress component improves. A review of post-sling urgency problems found that urgency and urgency incontinence can persist, improve, or worsen in women who had both types before surgery, and can even appear for the first time in women who originally had only stress incontinence.²

When the Sling Is Too Tight or Too Loose

The tension of the sling at the time of placement is one of the biggest surgical variables. If it’s too loose, it won’t provide enough support and stress leaking continues. If it’s too tight, it can partially obstruct the urethra, leading to difficulty emptying your bladder, a weak stream, straining to urinate, or the feeling that your bladder never fully empties. Urinary retention or obstructive voiding symptoms can arise from oversuspension of the urethra or exaggerated tension on the sling.³ Obstruction from an overly tight sling can also trigger new urgency symptoms, because the bladder has to work harder to push urine past the restriction, which irritates the bladder wall over time.

When a surgeon suspects the sling is too tight and causing obstruction, that same review notes that partial bladder outlet obstruction should always be considered, especially when urgency symptoms worsen or appear for the first time soon after surgery.² The timing is a useful clue: if new urgency started within weeks of the procedure, obstruction from the sling is high on the list. If urgency was already there before surgery, the sling may simply not have resolved it.

Sling position also matters. Research comparing the two main types of midurethral slings, retropubic (TVT) and transobturator (TOT), has shown that they support the urethra at slightly different angles and locations. One anatomical analysis found that TOT slings tend to sit more toward the proximal urethra, while TVT slings sit more distally, and this positional difference can influence outcomes, particularly in certain patient populations.⁴

Mesh Erosion and Infection

Most modern slings use synthetic mesh, and while serious complications are uncommon, mesh erosion is a recognized risk. Erosion means the mesh works its way through the vaginal wall, into the urethra, or occasionally into the bladder. This can cause pain, bleeding, discharge, recurrent urinary tract infections, and ongoing incontinence. Research into the mechanics of erosion has found that it’s linked to bacterial colonization of the mesh material. Certain mesh types with small pore sizes can harbor bacteria in spaces too tight for the body’s immune cells to reach and clear the infection, essentially creating a sheltered environment for ongoing low-grade infection.⁵

Erosion doesn’t always happen right away. It can develop months or even years after surgery. Symptoms that should prompt evaluation include new or worsening pelvic pain, pain during intercourse, unusual vaginal discharge, blood in the urine, and of course, recurrent leaking. Among the broad catalog of sling complications, mesh erosion into the urethra or bladder, vaginal extrusion of mesh, urinary tract infections, pain, and urgency have all been documented.⁶

Intrinsic Sphincter Deficiency

Your urethra has a built-in sealing mechanism, a ring of muscle and tissue that keeps it closed at rest. When that mechanism is weak, doctors call it intrinsic sphincter deficiency, or ISD. This is different from the more common cause of stress incontinence, which involves the urethra moving out of position under pressure (urethral hypermobility). A sling corrects hypermobility very well, but if the deeper problem is that the urethra’s own closure mechanism is weak, the sling alone may not be enough.

The numbers here are striking. One study found that women with ISD had objective cure rates of about 52% and subjective cure rates of roughly 48% after midurethral sling surgery, compared to about 88% and 86% in the overall population.⁷ That’s a dramatic gap. If you had ISD before surgery, the odds of still leaking afterward are substantially higher, and your surgeon may not have fully appreciated the degree of sphincter weakness beforehand.

The type of sling also appears to matter for ISD patients. Research comparing TVT and TOT slings in women with ISD suggested that the retropubic approach (TVT) produced better results, possibly because its more vertical angle of support provides more effective compression of a weak urethra.⁴ If you had a TOT sling and have ISD, that mismatch could be part of the explanation.

New Urgency After Surgery

One of the more frustrating outcomes is developing urgency incontinence you didn’t have before, sometimes called de novo overactive bladder. You went in for stress leaking and came out with a different kind of leaking. This can feel baffling, and the exact mechanisms aren’t fully understood, but obstruction is a leading suspect as noted earlier.

A study comparing medium-term outcomes of retropubic and transobturator slings found that among women who already had overactive bladder symptoms before surgery, about 78% of TVT patients and 61% of TOT patients saw improvement. But not everyone improved. Symptoms stayed the same in a notable fraction, and one patient in the TVT group developed new overactive bladder symptoms that hadn’t been there before.⁸ Although developing entirely new urgency is relatively uncommon, it does happen, and it’s genuinely different from residual stress incontinence. Treating it requires a different approach entirely, often involving bladder-calming medications, behavioral strategies, or pelvic floor therapy aimed at relaxation rather than strengthening.

Body Weight and Hormonal Status

Your body weight at the time of surgery and in the years after can influence how well the sling holds up. Higher body weight puts more downward pressure on the pelvic floor and can stress the sling’s support. A study looking at midurethral sling outcomes across weight categories found that objective cure rates were about 91% in normal-weight women, 88% in overweight women, and 76% in obese women. Subjective cure rates followed a similar pattern, dropping to about 70% in the obese group.⁹ That means if you’ve gained significant weight since surgery, or if you were in a higher weight category at the time of the procedure, that factor alone could explain ongoing leaking.

Hormonal changes, particularly from menopause, also affect the tissues around the urethra and vagina. Declining estrogen thins and weakens the tissue that the sling sits against, potentially reducing its effectiveness over time. Research on menopausal women with slings found that those who received supplemental local estrogen therapy alongside their sling had better long-term outcomes, including a more pronounced reduction in incontinence episodes and lower distress scores at two years compared to women who had the sling alone.¹⁰ If you’re postmenopausal and haven’t discussed vaginal estrogen with your doctor, this could be a relatively simple intervention to try.

Weak Bladder Muscle

This one gets less attention but is worth knowing about. Some women have a bladder muscle (the detrusor) that doesn’t contract strongly enough to empty the bladder efficiently, a condition called detrusor underactivity. After sling surgery adds a bit of resistance to the urethra, a weak detrusor may struggle even more to push urine out. One study found that women with detrusor underactivity before surgery showed a higher proportion of voiding dysfunction afterward, though the sling’s success at stopping leaking wasn’t significantly affected.¹¹

A separate analysis of women with complicated stress incontinence, including those with detrusor underactivity, found a post-operative rate of temporary urinary retention of about 13-16%, de novo overactive bladder in up to 12.5% of complicated cases, and stress incontinence recurrence in roughly 3-5%.¹² The practical takeaway is that if you had trouble fully emptying your bladder before surgery, or if urodynamic testing showed weak detrusor contractions, your risk of post-surgical voiding problems is higher.

How the Problem Gets Diagnosed

Figuring out why you’re still leaking requires more than a conversation, though a thorough history is where it starts. Your doctor needs to know exactly what your leaking looks like now. Does it happen with physical activity? With sudden urges? Continuously? At night? Has it changed since surgery? All of these details narrow the possibilities.

Physical examination can reveal whether the sling has shifted, whether there’s mesh exposure in the vaginal wall, or whether the urethra moves excessively despite the sling being in place. Pelvic floor ultrasound has become a valuable tool for visualizing the sling itself. The mesh shows up as a bright echogenic band on ultrasound and can be assessed dynamically as you cough or strain, allowing the clinician to see whether the sling is in the right position, whether it’s too tight or too loose, and whether there are signs of erosion or obstruction. Urodynamic testing, which measures bladder pressures and flow rates, can identify whether obstruction, weak bladder contractions, or overactive bladder is contributing. The combination of imaging and functional testing gives a much clearer picture than either alone.

Non-Surgical Paths Forward

Not every case of persistent leaking after sling surgery requires another operation. Conservative options are usually tried first, and they include pelvic floor physical therapy, incontinence pessary devices, commercially available vaginal support devices, and medications.¹ Pelvic floor therapy deserves particular attention because it can help whether your problem is residual stress incontinence, urgency, or both. A skilled pelvic floor therapist can assess whether your muscles are weak, overactive, or poorly coordinated and tailor the program accordingly.

If urgency is the dominant problem, medications that calm the bladder muscle (anticholinergics or beta-3 agonists) can reduce urgency episodes. Behavioral strategies like timed voiding and fluid management also help. For stress leaking that’s mild, a pessary or vaginal insert can provide mechanical support during exercise or other trigger activities without needing another surgery. Weight loss, if applicable, can meaningfully reduce the strain on the pelvic floor given the clear relationship between body weight and sling outcomes described earlier.

When a Second Procedure Is Needed

If conservative measures aren’t enough, several surgical options exist for persistent or recurrent stress incontinence after a failed sling. The current landscape of second-line procedures includes urethral bulking injections, repeat midurethral sling placement, pubovaginal sling using your own tissue, and Burch colposuspension.¹³

Urethral bulking involves injecting a material around the urethra to plump up the tissue and improve its seal. It’s the least invasive option and can be done as an office or outpatient procedure. In one study of women with persistent or recurrent stress incontinence after a sling, about 71% experienced at least partial improvement after bulking injections, with stress-specific improvement persisting at an average of about three years in patients with follow-up data.¹⁴ Another study reported even higher short-term success, with cured or improved rates of about 93% at one month, 88% at six months, and 84% at twelve months.¹⁵ The tradeoff is that bulking tends to have lower long-term durability than repeat sling or fascial sling procedures, and some women need repeat injections.¹³

Repeat midurethral sling is currently the most widely used second-line surgical approach. One question that often comes up is whether the original sling should be removed at the same time. A study examining this found that removing the first sling during placement of the second did not improve outcomes in a small group of patients.¹⁶ That said, if the first sling is causing mesh-related complications like erosion or pain, removal becomes necessary regardless of whether it helps incontinence outcomes.

For women with intrinsic sphincter deficiency specifically, the evidence leans toward retropubic slings or pubovaginal slings using the patient’s own tissue (autologous fascia) as second-line options, because these tend to produce higher success rates than transobturator approaches or bulking agents in that population.¹³ When the original surgery caused mesh complications, a mesh-free option like pubovaginal sling or Burch colposuspension makes sense to avoid compounding the problem with additional synthetic material.

What Satisfaction After Surgery Actually Looks Like

It helps to have realistic expectations about what “success” means after sling surgery. In a large trial comparing retropubic and transobturator slings, about 86-90% of women reported satisfaction with their urine leakage at one year. That’s a high number, but it also means roughly one in seven or eight women were not satisfied.¹⁷ The same study identified several baseline factors that predicted lower satisfaction: worse pre-existing urgency, detrusor overactivity on urodynamic testing, and diabetes. Satisfaction was also closely tied to the reduction in symptom burden and the absence of complications.

These findings reinforce something important: the women most likely to be disappointed are those who went in with more complex bladder problems beyond pure stress incontinence. If you had urgency before surgery, or if your diabetes affects your nerve and tissue health, the sling was always facing an uphill battle. That doesn’t mean it was the wrong choice, but it does mean that additional treatments may be needed to get the result you were hoping for. If you’re still leaking and haven’t had a thorough post-operative evaluation including a clear diagnosis of what type of incontinence remains, that’s the single most productive step you can take. The fix depends entirely on what’s actually going wrong, and the range of possibilities is broader than most patients realize going in.

1
PubMed Central. Management of patients with stress urinary incontinence after failed midurethral sling
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PubMed Central. Urgency and urgency incontinence following stress urinary incontinence surgery: A review of evaluation and management
3
PubMed Central. Evaluation and management of voiding dysfunction after midurethral sling procedures
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PLoS ONE. Comparison of Effectiveness between Tension-Free Vaginal Tape (TVT) and Trans-Obturator Tape (TOT) in Patients with Stress Urinary Incontinence and Intrinsic Sphincter Deficiency
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PubMed Central. Postoperative erosions of the Mersilene® suburethral sling mesh for antiincontinence surgery
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PubMed Central. Update on complications of synthetic suburethral slings
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PubMed. Impact of intrinsic sphincter deficiency on mid-urethral sling outcomes
8
PubMed Central. Retropubic versus transobturator slings: Medium‐term satisfaction and overactive bladder outcomes
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PubMed. Mid Urethral Slings for the Treatment of Urodynamic Stress Incontinence in Overweight and Obese Women: Surgical Outcomes and Preoperative Predictors of Failure
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UKRAINIAN JOURNAL OF PERINATOLOGY AND PEDIATRICS. Study of possibilities to improve the effectiveness of stress urinary incontinence treatment in menopausal women with an implanted TVT-O sling
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PubMed. Is detrusor underactivity associated with voiding dysfunction after single incision sling surgery?
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PubMed Central. Detrusor underactivity and complicated stress urinary incontinence: a cross-data study
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International Neurourology Journal. Second-Line Surgical Management After Midurethral Sling Failure
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PubMed. Can Urethral Bulking Agents Salvage Failed Slings?
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PubMed. Urethral bulking for recurrent stress urinary incontinence after midurethral sling failure
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PubMed. Concurrent midurethral sling excision or lysis at the time of repeat sling for treatment of recurrent or persistent stress urinary incontinence
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PubMed Central. Patient Satisfaction Following Midurethral Sling Surgery For Stress Urinary Incontinence