Perineal Reconstruction: Principles and Flap Selection
Few regions punish poor planning like the perineum — the pelvic outlet sits at the crossroads of the urinary, gynecologic, and GI tracts, and the wrong flap choice in an irradiated or contaminated field gets you back in the OR fast.
In this episode of Plastics in Practice, we walk through the core principles of perineal reconstruction: anatomy and vascular supply, the reconstructive ladder, pelvic dead-space management, and the workhorse flaps you actually need to know — VRAM, gracilis, posterior thigh, Singapore, and the greater omentum. We finish with functional restoration in both female and male patients, including the Cordeiro classification for acquired vaginal defects, scrotal reconstruction after Fournier's, and the basics of microsurgical penile replantation.
Key takeaways:
* The perineum is a diamond between the pubic symphysis, ischial tuberosities, and coccyx — anterior urogenital triangle and posterior anal triangle.¹
* Pelvic dead space after APR or exenteration is dangerous — fill it with a well-vascularized flap to cut abscess, dehiscence, and bowel-obstruction risk.²
* VRAM is the workhorse for combined pelvic and perineal defects; it beats thigh flaps on major complications in this setting.³
* Gracilis is the workhorse when you don't want a laparotomy — versatile, low donor morbidity, but watch the short pedicle and unreliable skin paddle for large defects.⁴
* Singapore flap is the go-to for vaginal reconstruction — sensate, axial, and preserved by the superficial perineal artery.
* Use the Cordeiro classification for acquired vaginal defects: IA → Singapore, IB → VRAM, IIA → rolled rectus, IIB → bilateral gracilis.⁵
* Scrotal reconstruction after Fournier's: up to 50% primary closure; otherwise meshed STSG with tunica vaginalis intact and spermatic cords sewn together first.⁶
* Penile replantation: microsurgical repair within 6 h warm or 16 h cold ischemia — urethra, tunica albuginea, dorsal artery and vein, dorsal nerve, plus suprapubic cystostomy.⁶
This content is for educational purposes only and is not medical advice.
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References (AMA):
1. Tran PH, Lemaine V. Reconstruction of the perineum. In: Thorne CH, ed. Grabb & Smith's Plastic Surgery. 8th ed.
2. Butler CE, Rodriguez-Bigas MA. Pelvic reconstruction after abdominoperineal resection: is it worthwhile? Ann Surg Oncol. 2005;12:91-94.
3. Nelson RA, Butler CE. Surgical outcomes of VRAM versus thigh flaps for immediate reconstruction of pelvic and perineal cancer resection defects. Plast Reconstr Surg. 2009;123:175-183.
4. Friedman JD, Reece GR, Eldor L. The utility of the posterior thigh flap for complex pelvic and perineal reconstruction. Plast Reconstr Surg. 2010;126:146-155.
5. Cordeiro PG, Pusic AL, Disa JJ. A classification system and reconstructive algorithm for acquired vaginal defects. Plast Reconstr Surg. 2002;110:1058-1065.
6. Campbell MF, Wein AJ, Kavoussi LR. Campbell-Walsh Urology. 9th ed. Saunders; 2007.
