My stricture keeps coming back

Why stretching keeps failing

A stricture is scar tissue in the wall of the urethra. Cutting it or stretching it opens the channel, but the injury of doing so heals the way scar always heals — by making more scar. Nothing about the procedure interrupts that.

The randomised evidence puts a figure on it. In the control arm of the ROBUST III trial, standard endoscopic management — dilatation or internal urethrotomy — achieved anatomical success in 27% at six months.¹²

That is the number worth having before you agree to a fourth dilatation.

What a drug-coated balloon does differently

The Optilume balloon combines the mechanical part of a dilatation with a local dose of paclitaxel, a drug that interferes with cell division and so suppresses the fibroblast activity that lays down the recurrent scar.³⁴⁵ It is the same principle used in coronary and peripheral arteries, applied to the urethra.

It received FDA approval for male urethral strictures in December 2021 and now appears in guidance for recurrent bulbar strictures under 3 cm.⁶⁷

Does it work?

Yes, and unusually for this field the best evidence is randomised.

In ROBUST III, anatomical success at six months was 75% against 27% for standard endoscopic management,¹² with 77.8% free of reintervention at two years⁸ and 71% at three years — essentially unchanged from the two-year figure, and roughly three times the control group's rate at one year.²

Around that trial sits a consistent body of real-world data:

• A meta-analysis of 7 studies and 457 patients: recurrence-free rate about 81%, complications 9.5%.⁹
• A Spanish multicentre series of 238 men: 73.8% success at a median eight months.¹⁰
• A single US institution: 90.7% free of reintervention at a mean nine months.¹¹
• A UK institutional series with a median follow-up of 22.9 months: 82% free of reintervention, across mixed causes including radiation-induced strictures.¹²
• An Australian prospective cohort of high-risk strictures over 2 cm: 76% stricture-free at 30 months, with no complications.¹³

The longest data are from ROBUST I, which reported 58% functional success at five years — with peak flow improving from 5.0 to 19.9 mL/s and symptom scores from 25.2 to 7.2 — and an estimated 71.7% freedom from repeat intervention over the same period.³⁷¹⁴ Those two figures measure different things: one asks whether flow and symptoms still meet a threshold, the other whether anything further had to be done. ROBUST I was also a single-arm study of 53 men with strictures no longer than 2 cm, so the five-year numbers carry less weight than the three-year randomised one.

What are the risks?

Mild and mostly transient: burning on passing urine, urinary infection, and blood in the urine for a short period.¹²⁸

Two specific reassurances stand out. Erectile function was not significantly affected across the ROBUST trials as measured by the standard questionnaire.³⁸ And in a dedicated study of 53 men with strictures at the sphincter level — the anatomy where any treatment risks continence — there was no new urinary incontinence, with 66% recurrence-free at last follow-up.¹⁵

Where it works less well

This is the part usually left out of the marketing.

Penile strictures. A small German series of 8 men reported symptom scores improving from 25.5 to 5.0 with no reintervention at 16.5 months.¹⁶ But in the penile subgroup of ROBUST III, freedom from reintervention fell from 75% at one year to 47% at two.¹⁶ The bulbar results do not transfer to the penile urethra, and anyone quoting you the headline figure for a penile stricture is quoting the wrong study.

After a previous urethroplasty. Two studies, both reasonable. A multicentre US series of 33 men found 80% early success against 88.9% in controls — no significant difference.⁵ A German multicentre series of 25 men reported 83% functional success at 12 months and 75.4% free of reintervention.¹⁷

If you are diabetic. In one multicentre European cohort, diabetes independently predicted recurrence with an odds ratio of 7.66.¹⁸ That is a large effect and a reason to have your glucose control looked at as part of the treatment rather than alongside it.

The gap nobody should paper over

There is no study comparing Optilume directly with urethroplasty.³

That matters because urethroplasty — open reconstruction of the narrowed segment — is the durable operation. It is bigger, it usually means a hospital stay, and its results in the right hands are long-lasting. A drug-coated balloon is an endoscopic day case with far less to recover from.

Choosing between them is therefore a decision made without the trial that would settle it. What is known is that the balloon substantially outperforms repeat stretching, and that it has not been tested against the operation it is most often used to avoid.

Most published patients have also had recurrent strictures with several previous procedures. Whether it works as a first-line treatment is being tested now, in a randomised trial enrolling 140 previously untreated men.¹⁹ One small series found no recurrence among 7 treatment-naïve patients — encouraging, and far too small to act on.⁴ A European registry is collecting real-world outcomes across broader practice.³⁷

How strong is the evidence?

Strong for superiority over standard endoscopic management in recurrent bulbar strictures under 3 cm: a randomised controlled trial with three-year follow-up, supported by a meta-analysis and several independent real-world cohorts.¹²⁹

Moderate for durability beyond three years, which rests on a single-arm study.¹⁴

Weak or absent for penile strictures, for first-line use, and for any comparison against urethroplasty.¹⁶¹⁹³

Bottom line

If your stricture is in the bulbar urethra, under 3 cm, and has come back after dilatation or urethrotomy, a drug-coated balloon is a genuinely evidence-based alternative to being stretched again — and the randomised comparison is not close.

If it is in the penile urethra, or long, or you are being offered it instead of an operation you were previously advised to have, the picture is much less settled and you should be told that plainly.

The question I would want answered before agreeing to anything is not "does this work?" but "how long and where exactly is my stricture, and has anyone measured it?" A urethrogram and a flow test take an afternoon and they decide the whole conversation. Being stretched a fifth time because nobody has looked properly is the commonest avoidable thing I see in this condition.

And if you also leak after prostate surgery, tell whoever is planning your continence operation about the stricture — it changes the risks materially.

Worth reading alongside: the full appraisal of the evidence behind Optilume.