Urethroplasty with Pedicled Tunica Vaginalis for the Treatment of Long-segment Anterior Urethral Stricture Caused by Lichen Sclerosus of Glans Penis
October 18th, 2024
This article introduces a surgical method using a pedicled tunica vaginalis to treat long-segment urethral stricture resulting from lichen sclerosus. The tunica vaginalis is an excellent substitute for the urethra, leading to quick postoperative recovery for patients.
This research introduces a surgical method using a pedicled tunica vaginalis to treat long segment urethral stricture, resulting from lichen sclerosus. Urethroplasty techniques are used to treat long segment anterior urethral strictures. Among the commonly employed urethral substitutes are bladder mucosa, oral mucosa, colonic mucosa, preputial graft, and tunica vaginalis. Each possessing unique advantages and limitations. This technique has the advantages of a high surgical success rate, convenient graft harvesting, simple operation, less trauma, and fewer complications. And it is easy to promote and carry out in primary healthcare. After anesthetizing the patient, measure and mark a position approximately 0.5 centimeters proximal to the coronal sulcus as the starting point. Perform a circumferential incision of the foreskin at the marked position. Gradually retract the foreskin proximally towards the base of the penis. Carefully dissect and release any adhesions of the inner foreskin until the penile buck's fascia is fully exposed. Next, make a ventral longitudinal incision along the stenotic urethral segment, extending approximately 0.5 to one centimeter into the adjacent normal urethral tissue. Following the incision, examine the site to confirm adequate exposure of the urethral stricture. Insert a 24 French Foley catheter into the urethra. Perform a longitudinal incision through the scrotal wall. Sequentially incise the layers of skin and the underlying fascia to gradually expose the parietal layer of the tunica vaginalis. Make an arcuate incision on the tunica vaginalis wall near the epididymal margin. Through this incision, open the tunica vaginalis cavity. Harvest a rectangular flap of approximately one centimeter by seven centimeters within the tunica vaginalis cavity through excision along the course of the epidemius. Similarly, a rectangular flap from another testicle. Using the finger, gently create a tunnel by blunt dissection through the subcutaneous loose connective tissue between the scrotum and the base of the penis. Next, carefully feed the pedicled tunica vaginalis flap through the tunnel without torsion, and mobilize it to the side of the incised ventral urethra. Retain the incised urethral stricture segment as a urethral plate, and orient the smooth serosal surface of the tunica vaginalis flap to face the urethral plate. Use 5-O absorbable sutures to place continuous running locked sutures, approximating the edge of the tunica vaginalis flap to both sides of the urethral incision. Reposition the foreskin meticulously over the glands penis. Close the scrotal tissue in layers using fine absorbable sutures. Retrograde urethrogram demonstrated a markedly dilated urethral caliber postoperatively, compared to the preoperative state.
Overview
This article introduces a surgical method using a pedicled tunica vaginalis to treat long-segment urethral stricture resulting from lichen sclerosus. The technique offers a high surgical success rate and promotes quick postoperative recovery.
Key Study Components
Area of Science
- Surgery
- Urology
- Urethral Reconstruction
Background
- Long-segment urethral strictures can be challenging to treat.
- Common substitutes for urethral reconstruction include bladder mucosa and oral mucosa.
- The tunica vaginalis is a promising alternative with unique advantages.
- Understanding surgical techniques is essential for effective treatment.
Purpose of Study
- To introduce a novel surgical technique using the tunica vaginalis.
- To evaluate the effectiveness of this method in treating urethral strictures.
- To promote the technique for use in primary healthcare settings.
Methods Used
- Patient anesthetization and marking of incision sites.
- Circumferential incision of the foreskin and dissection of the inner foreskin.
- Longitudinal incision along the stenotic urethral segment.
- Harvesting of a rectangular flap from the tunica vaginalis.
Main Results
- The surgical technique resulted in a markedly dilated urethral caliber postoperatively.
- High success rates were observed with minimal complications.
- The method is easy to promote in primary healthcare.
- Quick postoperative recovery was noted in patients.
Conclusions
- The pedicled tunica vaginalis is an effective substitute for urethral reconstruction.
- This technique can be widely adopted due to its simplicity and effectiveness.
- Further studies may enhance understanding and application in clinical settings.
Frequently Asked Questions
Executive Industry Relevance
Innovative tissue engineering strategies for urethral reconstruction address critical gaps in treating long-segment anterior urethral strictures, especially where conventional grafts are limited by infection risk and harvesting complexity. The use of pedicled tunica vaginalis as a scaffold offers a reproducible, vascularized alternative that may reduce recurrence and facilitate broader adoption in diverse healthcare settings. This approach supports predictive confidence in reconstructive outcomes and informs portfolio decisions for translational tissue repair technologies.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Enables interrogation of tissue compatibility and integration for reconstructive biomaterials.
- Supports biological de-risking by demonstrating vascularization and epithelialization in vivo.
- Facilitates functional validation of alternative graft sources for urogenital repair.
Screening & Assay Development
- Provides a validated biological system for evaluating graft-host integration and infection resistance.
- Enables reproducible assessment of tissue remodeling and healing kinetics.
- Supports quantitative measurement of urethral caliber and graft take rate post-implantation.
Translational & Preclinical Research
- Aligns with disease-relevant models of urethral stricture and tissue fibrosis.
- Demonstrates translational continuity from animal studies to clinical application in reconstructive urology.
- Informs risk-adjusted advancement of tissue-engineered scaffolds for urogenital indications.
Pipeline & Workflow Integration
This method integrates into the discovery-to-preclinical continuum for tissue repair, bridging early biomaterial validation with translational surgical models.
- Discovery Biology: Supports hypothesis testing for scaffold-host epithelialization and vascularization.
- Screening: Enables standardized evaluation of graft performance and infection resistance.
- Analytics: Provides quantitative readouts such as urethral caliber and graft integration metrics.
- Translational Research: Connects animal model findings to clinical feasibility in reconstructive surgery.
- Enterprise Reuse: Establishes a platform for evaluating alternative tissue sources in urogenital repair.
Operational & Enterprise Impact
- Scientific Value: Enhances predictive confidence in graft integration and reduces mechanistic ambiguity in tissue repair.
- Operational Value: Promotes standardization and reproducibility in reconstructive procedures.
- Strategic Value: Informs go/no-go decisions for tissue engineering platforms and reduces late-stage biological risk.
- Portfolio Impact: Supports risk-adjusted prioritization of novel biomaterials for urogenital reconstruction.
Implementation Considerations
- Requires surgical expertise in graft harvesting and reconstructive techniques.
- Needs sterile instrumentation and imaging for intraoperative and postoperative assessment.
- Demands cross-team standardization for graft preparation and outcome measurement.
- Adaptation may vary across anatomical sites and patient populations.
- Potential limitations include graft size constraints and donor tissue availability.
