Laminated Gracilis Flap Urethroplasty
The laminated gracilis flap technique combines a split-thickness skin graft or oral mucosal graft laminated onto the surface of the gracilis muscle to create a composite flap for urethral reconstruction.[1] The muscle provides vascular support for the epithelial lining layer in complex cases where local tissue is insufficient. This approach is reserved for salvage situations such as radiation-damaged tissue beds or major fistula repair.[2]
Indications
| Indication | Why a laminated gracilis is considered |
|---|---|
| Radiation-damaged urethral bed | Muscle supplies vascularized support when graft take would otherwise be poor |
| Complex urethral fistula with soft-tissue loss | Adds bulk and vascularity between urinary and adjacent viscera |
| Failed staged urethroplasty with scarred local tissues | Provides a new vascularized carrier for epithelial lining |
| Salvage perineal reconstruction when local fasciocutaneous options are exhausted | Gracilis is reliable, expendable, and outside many pelvic radiation fields |
Technique Overview
The concept is staged tissue engineering with autologous tissue: a skin or mucosal graft is first laminated onto the gracilis muscle so it can vascularize, then the composite epithelialized muscle flap is transferred or inset to reconstruct the urethral segment. It is a salvage strategy, not a routine substitute for BMG urethroplasty.
Key Steps
- Control infection, fistula output, and urinary drainage before reconstruction.
- Harvest or expose the gracilis muscle on its dominant pedicle.
- Laminate the epithelial graft onto the muscle surface and secure it without dead space.
- Allow maturation / vascularization when performed as a staged construct.
- Transfer the composite flap into the urethral defect or fistula field.
- Tubularize or inset the epithelial surface according to the urethral reconstruction plan.
- Protect with catheter drainage and, when needed, suprapubic diversion.
Outcomes & Evidence
The published evidence is sparse and salvage-heavy. The strongest transferable lesson from gracilis interposition in fistula and radiated urethral repair is that vascularized muscle improves the biology of a hostile field. Stricture-free and fistula-free outcomes are therefore case-mix dependent, and counseling should emphasize staged care, possible revision, and the chance that diversion may still be required.
See Also
References
1. Zinman LN. "The management of the complex urethral stricture." AUA Update Series. 1997;16(Lesson 14):106–11.
2. Spilotros M, Simonato A, Gacci M, Masieri L. "Gracilis flap urethroplasty repair for radiation-induced urethral strictures: a contemporary series." Urology. 2018;116:191–5. PMID: 29438707