DoVe Trial: Dorsal Onlay Versus Ventral Onlay in Isolated Bulbar Urethral Strictures

Urethra Stenosis Clinical Trial

— DoVe  

Official title:

DoVe Trial: a Randomized Controlled Trial Comparing Dorsal Onlay Versus Ventral Onlay in Isolated Bulbar Urethral Strictures

Clinical Trial Details — Status: Recruiting

Administrative data

• NCT number: NCT04551417
• Other study ID #: BC-06890
• Status: Recruiting
• Phase: N/A
• Start date: March 4, 2020
• Est. completion date: January 1, 2026

Study information

• Verified date: January 2024
• Source: University Hospital, Ghent
• Contact: Nicolaas Lumen
• Phone: +32 9 332 22 76
• Email: nicolaas.lumen[@]uzgent.be
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

For bulbar urethral strictures, it remains unclear whether ventral onlay graft urethroplasty is non-inferior to dorsal onlay graft urethroplasty in terms of patency rates.

Description:

Urethral stricture disease is a common urological condition in men. Although rigorous epidemiologic data is sparse, the existing papers report an incidence varying between 0.6 and 1.4 percent1. Urethral strictures can occur throughout the entire length of the urethra, but mainly involve the anterior urethra and, in particular, the bulbar segment2.

The International Consultation on Urologic Diseases (ICUD) recommends anastomotic repair (AR) urethroplasty for isolated, short, bulbar urethral strictures3. However, AR urethroplasty is only possible up to a certain point of stricture length. The elasticity of the bulbar urethra is estimated to be about 25% and given the average bulbar urethral length of 10 cm, one could simply calculate that strictures up to 2.5 cm can be treated with AR urethroplasty. However, this border of 2.5 cm is rather arbitrary as additional length may be gained through the different maneuvers of Webster et al., enabling the option of AR for even longer strictures4. Furthermore, the location of the stricture within the bulbar segment plays an important role as well: a proximal bulbar stricture location allows AR for longer strictured segments (> 2.5 cm) than a more distal stricture location which nears the penoscrotal angle. Anyhow, the key for a successful AR procedure is to perform a well-vascularized and tension-free anastomosis5. Whenever this is impossible to achieve, even after performing the length-gaining maneuvers of Webster et al., it is recommended to perform a so-called 'substitution urethroplasty' in which the strictured area of the urethra is opened and augmented with a free graft or a pedicled flap5.

Within the option of substitution urethroplasty, free graft urethroplasty (FGU) definitely represents the easiest and most straightforward treatment option. Herein, urethral surgeons initially started by placing grafts ventrally 'on' the urethra: 'ventral onlay FGU'. Later, Barbagli et al. started placing grafts dorsally: 'dorsal onlay FGU'6. They advocated that this dorsal graft position would lead to better graft anchorage, less graft mobility and less graft sacculation. However, to date, there is no indisputable data to support the choice of one technique over another, not from a surgical point of view, nor from a functional point of view7. Furthermore, studies investigating this issue are mostly retrospective and thus only entail a low level of evidence7.

Against this background, the aim of the DoVe trial is to directly compare dorsal onlay and ventral onlay FGU for both surgical and functional outcome.

Recruitment information / eligibility

• Status: Recruiting
• Enrollment: 240
• Est. completion date: January 1, 2026
• Est. primary completion date: January 1, 2026
• Accepts healthy volunteers: No
• Gender: Male
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

• Voluntarily signed written informed consent according to the rules of Good Clinical Practice (Declaration of Helsinki) and national regulations (Appendix B).

• Age = 18 years.

• Male patient.

• Fit for operation, based on the surgeon's expert opinion.

• Isolated bulbar urethral stricture confirmed by imaging.

• Preputium, penile shaft skin, buccal mucosa and lingual mucosa are allowed as free graft material in the executed dorsal onlay or ventral onlay FGU.

• Patient is able and willing to attend the follow-up consultations.

Exclusion Criteria:

• Absence of signed written informed consent (Appendix B).

• Age < 18 years.

• Female patients.

• Transgender patients.

• Patients unfit for operation.

• Concomitant urethral strictures at other urethral locations (penile urethra, membranous urethra, prostatic urethra, bladder neck).

• A unique urethral stricture at other urethral locations (penile urethra, membranous urethra, prostatic urethra, bladder neck).

• Prior bulbar urethroplasty.

• Lichen Sclerosus related strictures.

• Strictures after failed hypospadias repair.

• Patients with neurogenic bladder.

• History of pelvic radiation therapy.

• Shift of technique to any other technique than dorsal or ventral onlay FGU due to any circumstance (post-hoc exclusion).

• Utilization of free graft material other than preputium, penile shaft skin, buccal mucosa or lingual mucosa.

• Any condition or situation, which, in the investigator's opinion, puts the patient at significant risk, could confound the study results, or may interfere significantly with the patient's participation in the study.

• Patient declares that it will be impossible for him to attend the follow-up consultations.

Related Conditions & MeSH terms

• Urethra Stenosis
• Urethral Stricture

Intervention

Procedure:
• Free graft urethroplasty
Free graft urethroplasty will be performed either with ventral or dorsal onlay of the graft.

Locations

Country	Name	City	State
Belgium	Ghent University Hospital	Ghent

Sponsors (1)

Lead Sponsor	Collaborator
University Hospital, Ghent

Country where clinical trial is conducted

Belgium, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Failure-free survival after 24 months	Failure is defined as the inability to pass a flexible 16 Fr cystoscope through the reconstructed area without damaging the urethral mucosa.	24 months
Secondary	Change in postoperative erectile function	Assessed with IIEF 5 questionnaire (international index on erectile function: score between 5 and 25, higher scores indicating better erectile function)	Baseline questionnaire, followed by questionnaire at 3, 12 and 24 months of follow-up.
Secondary	Change in ejaculatory function	Assessed with MSHQ-EjD short form questionnaire (male sexual health questionnaire - ejaculatory dysfunction short form: score between 1 and 15, higher scores indicating better ejaculatory function)	Baseline questionnaire, followed by questionnaire at 3, 12 and 24 months of follow-up.
Secondary	Change in LUTS	Assessed with Peeling's voiding picture (score between 1 and 4, lower scores indicating better strength of the urinary stream)	Baseline question, followed by question at 3, 12 and 24 months of follow-up.
Secondary	Change in LUTS	Assessed with ICIQ-MLUTS module (international consultation on incontinence questionnaire - male lower urinary tract symptoms: score between 0 and 24, higher scores indicating more LUTS)	Baseline questionnaire, followed by questionnaire at 3, 12 and 24 months of follow-up.
Secondary	Change in urinary continence	Assessed with ICIQ-UI short form questionnaire (international consultation on incontinence questionnaire - urinary incontinence: score between 0 and 21, higher scores indicating more urinary incontinence)	Baseline questionnaire, followed by questionnaire at 3, 12 and 24 months of follow-up.
Secondary	Change in maximum flow rate	Assessed with uroflowmetry (Qmax)	Uroflowmetry at baseline, followed by uroflowmetry at 3, 12 and 24 months of follow-up.
Secondary	Change in quality of life	Assessed with EQ-5D-3L (5 questions on quality of life resulting in digit score, e.g. 11231, higher scores indicating worse quality of life)	Baseline questionnaire, followed by questionnaire at 3, 12 and 24 months of follow-up.
Secondary	Change in quality of life	Assessed with EQ-VAS (EQ-visual analogue scale: scale between 0 and 100, higher scores indicating better quality of life)	Baseline questionnaire, followed by questionnaire at 3, 12 and 24 months of follow-up.
Secondary	Patient satisfaction	Assessed with two general patient satisfaction questions	Assessed after 3, 12 and 24 months of follow-up.
Secondary	Postoperative complication rate	Categorized according to the Clavien-Dindo classification system	Within 90 days postoperatively