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Vertical Rectus Abdominis Myocutaneous (VRAM) Flap

The VRAM flap is the workhorse abdominal-based pedicled flap for pelvic and perineal reconstruction after radical urologic oncology — particularly after pelvic exenteration, anterior exenteration with radical cystectomy, and complex radiation-induced urogenital fistula repair. It delivers a large volume of well-vascularized, non-irradiated tissue on a reliable vascular pedicle, obliterating the non-collapsible dead space that is the single largest driver of postoperative complications after pelvic exenteration in a radiated field.

See the overview article for comparative context: Flaps in GU Reconstruction, and the anatomy references: Abdominal Wall and Pelvic Vascular Anatomy.

External technique atlas: microsurgeon.org — Rectus Muscle Flap.

Gross Anatomy​

The paired rectus abdominis muscles provide abdominal flexion and support the intra-abdominal contents.

FeatureValue
OriginPubic symphysis + pubic crest
Insertion5th–7th costal cartilages
LengthUp to 30 cm
WidthUp to 10 cm
Enclosed byRectus sheath (anterior + posterior)

The Arcuate Line​

A critical landmark for VRAM harvest: below the arcuate line, the posterior rectus sheath is absent (all aponeurotic layers pass anterior to the muscle). Above the arcuate line, the muscle is enclosed anteriorly and posteriorly. Two implications:

  1. Below the arcuate line, no posterior fascial defect is created at harvest — donor-site integrity here depends entirely on the intact anterior sheath.
  2. Above the arcuate line, careful anterior-sheath closure (± mesh) is essential to prevent incisional hernia.

Tendinous Inscriptions​

Three to four transverse fibrous inscriptions tether the muscle to the overlying anterior sheath. At these points, the fascia is tightly adherent and must be sharply dissected during harvest to avoid damaging muscle fibers.

Vascular Anatomy​

The rectus abdominis has a dual blood supply — inferior and superior epigastric systems — that communicate through choke vessels within the muscle. For pelvic and perineal reconstruction, the flap is inferiorly based on the deep inferior epigastric artery.

Dominant Pedicle — Deep Inferior Epigastric Artery (DIEA)​

  • Origin: external iliac artery, just above the inguinal ligament.
  • Course: enters the deep surface of the rectus abdominis near its lower third, ascends along the deep muscle surface, anastomoses with the superior epigastric system.
  • Artery caliber: 2–4 mm at origin.
  • Pedicle length: 5–7 cm easily obtainable; additional length via intramuscular dissection.
  • Venae comitantes: paired, merging at the external iliac; one typically larger and comparable to arterial caliber.

Postoperative imaging studies confirm the DIEA maintains flow in 98.3% of VRAM flaps — the pedicle is extraordinarily reliable.[3]

Superior Epigastric System​

  • Arises from the internal mammary artery as it crosses the costal margin.
  • Supplies the superior rectus.
  • Sacrificed during inferior-based VRAM harvest to mobilize the flap toward the pelvis.

Skin Paddle Perforators​

The skin paddle is supplied by musculocutaneous perforators through the anterior rectus sheath — principally in the paraumbilical region (rich perforator zone). This is why the skin paddle typically extends in a vertical orientation along the rectus axis.

Flap Design​

Inferiorly Based VRAM (Standard for Urologic Reconstruction)​

  • Skin paddle: vertical, 8–12 cm wide, extending from the costal margin down toward the pubis. Length adjusted to defect size.
  • Muscle component: full rectus or a muscle-sparing variant (see below).
  • Reach: perineum, pelvis, groin, proximal thigh via subcutaneous tunnel or through a prepared pelvic/retropubic corridor.

Superiorly Based​

Rarely used in urology — primarily for chest-wall reconstruction.

Free VRAM​

Rare urologic indication. Reserved for specific distant reconstruction needs.

Harvest Technique​

Open Standard Harvest​

  1. Incision — vertical paramedian over the rectus muscle axis (or low transverse depending on surgeon preference). Length determined by the muscle segment required.
  2. Subcutaneous dissection to the anterior rectus sheath; ligate any perforators encountered. Cautery risks damaging skin-paddle perforators — prefer fine ligatures.
  3. Anterior rectus sheath opened longitudinally. Elevate sheath medially and laterally with Allis clamps.
  4. Tendinous inscriptions — tightly adherent to sheath; tease off muscle sharply with electrocautery.
  5. Identify the DIEA laterally at the inferior-lateral muscle border, in the areolar fat plane. Trace the pedicle down to its origin at the external iliac.
  6. Divide the muscle origin at the pubis (finger-encircle, then cautery) while protecting the pedicle.
  7. Divide the muscle superiorly (costal margin level). Ligate or cauterize superior epigastric vessels securely — they will retract and bleed if missed.
  8. Isolate the flap on the DIEA pedicle. Tunnel subcutaneously or directly via the pelvis to the recipient site.
  9. Close the anterior rectus sheath with running non-absorbable suture. Add mesh reinforcement in most cases given the 15–17% hernia rate even with careful closure.
  10. Drain the donor site (suction) — especially when a skin paddle creates dead space above the fascia.

Oblique Rectus Abdominis Myocutaneous (ORAM) Variant​

The ORAM flap orients the skin paddle obliquely rather than vertically, offering a greater arc of rotation, thinner skin paddle, less bulk, and limited fascial harvest, with comparable complication rates to standard VRAM. Useful when the defect requires lateral reach (groin, proximal thigh) without the bulk of a full muscle paddle.[19]

Muscle-Sparing VRAM (MS-VRAM) Variants​

Developed to reduce donor-site morbidity:[8]

  • Modified long vertical flap — extensive coverage with preserved muscle width.
  • Wrapping flap — circumferential defects.
  • De-epithelialized flap — fills dead space without external skin coverage.
  • Cork flap — minimal-tissue variant; highest patient satisfaction, shortest LOS, lowest drain output.

Extended VRAM (eVRAM)​

Large pelviperineal defects where standard VRAM is insufficient. In a 44-patient series: 91% successful reconstruction, 3 flap failures, 39% perineal wound complications (8 requiring reoperation), 11% donor-site problems.[9]

Robotic Harvest​

Emerging technique. Inferior-based flap is harvested via three ports placed along a line between anterior axillary line and ASIS. Posterior rectus sheath opened from arcuate line to upper abdomen; DIEA dissected to external iliac; muscle divided cephalad at costal margin and caudad between symphysis and pedicle entry; flap delivered into pelvis for insetting.[18] Key benefit: avoids the midline laparotomy that would further weaken the anterior abdominal wall.

  • Davila 2022 demonstrated reduced complications and expanded use of robotic rectus harvest for pelvic reconstruction.[20]
  • Asaad 2021 described robotic rectus muscle flap following robotic extirpative surgery — a fully minimally invasive workflow that preserves the anterior rectus sheath.[21]

Critical Flap-Inset Considerations​

The most important technical point — flap failure is almost always due to inset error or inadequate postoperative care, not inherent vascular insufficiency (DIEA flow rate 98.3%).[3][10]

Rotation depends on defect location:[10]

Defect locationRotationResult
Anterior perineum (bladder, urethra, anterior vagina)270° in the sagittal planeCranial flap covers the anterior-most defect; optimal arc
Posterior perineum (rectum, posterior vagina)180° in the coronal planeCranial flap covers posterior-most defect; prevents pedicle tension

In either case, meticulous attention to pedicle orientation to avoid kinking, compression, or tension on the DIEA pedicle is paramount.

GU Reconstructive Applications​

Pelvic Exenteration and Radical Cystectomy​

The principal urologic indication. Total or anterior pelvic exenteration creates a non-collapsible pelvic cavity particularly problematic in the irradiated field. VRAM addresses two critical issues:[3]

  • Obliterates pelvic dead space → prevents fluid collection, abscess, and bowel prolapse into the pelvis.
  • Introduces non-irradiated, well-vascularized tissue into the radiated field.

In systematic reviews, pelvic exenteration represents the dominant indication — 75% of VRAM reconstructions in pooled series are for rectal or pelvic malignancies.[3]

Complex Urogenital Fistula Repair​

Radiation-induced vesicovaginal, urethrovaginal, and combined rectovesicovaginal fistulas after multiple failed repairs — the "disaster perineum." In a 12-patient series with mean 6.3-year follow-up, VRAM (or gracilis) successfully eradicated all fistulas and preserved continence in all patients; QoL was restored to general-population levels.[4] VRAM patients showed slight residual incontinence; gracilis patients achieved complete continence — one argument for gracilis in continence-critical cases.

For complex / refractory urethrovaginal fistulas specifically (after failed Martius or other simpler interpositions), Bruce 2000 described rectus abdominis muscle flap interposition between the closed fistula and the vaginal suture line as a salvage technique; the rectus bulk provides robust vascularized tissue coverage where local options have already failed.[22]

Vaginoplasty After Anterior Exenteration​

For radical cystectomy with partial or total vaginectomy for bladder or urethral carcinoma, the VRAM can be tubed or used as a skin paddle to reconstruct the vagina and perineum at the same setting. Parsons 2003 described this approach for urologic-malignancy anterior exenteration, achieving simultaneous defect coverage and neovaginal reconstruction.[23]

Bladder Neck Closure in Neurogenic Incontinence​

The rectus abdominis muscle flap can be interposed between the bladder neck and urethral stump as an adjunct to bladder-neck closure to prevent vesicourethral fistula — an alternative to omental interposition when omentum is unavailable or inadequate. Smith 2010 reported a preliminary pediatric neurogenic-incontinence series with promising results.[24]

Epispadias / Exstrophy Reconstruction​

Rectus abdominis muscle and fascia have been used to provide abdominal-wall support, coverage of the bladder neck and proximal urethra, and mons reconstruction in epispadias / exstrophy. Horton 1988 described this application as part of the multistage exstrophy reconstruction.[25]

Urosymphyseal Fistula (USF)​

A difficult indication where VRAM is viable but may not be first choice. A 2026 comparative study found:[5]

  • Omental flap — 90-day sepsis 3%, fistula recurrence lower than VRAM
  • VRAM — 90-day sepsis 27%, fistula recurrence 27.3%
  • Primary repair — recurrence >30%

Omental flap is increasingly the preferred first option for USF; VRAM reserved when omentum is unavailable or inadequate.

Genital Reconstruction​

Inferiorly based VRAM has been used for phalloplasty in selected cases (7-patient series) when other options (RFFF, ALT) are unavailable or contraindicated.[6] Not a first-line phalloplasty flap.

Groin and Proximal Thigh Defects​

After radical inguinal lymphadenectomy or tumor resection. 53-patient series: 47% complication rate, only 2% failure rate.[7] Mesh at donor site does not significantly change hernia rate (16.7% mesh vs 15.1% primary).

Coverage of Major Vessels / Visceral Repairs​

The rectus bulk is useful for covering major vessels or visceral repairs in the pelvic basin — obturator vessels after lymphadenectomy, visceral suture lines after complex resection, or pubectomy sites after osteomyelitis debridement.

Outcomes​

Systematic Review — 1,827 Patients[1]​

OutcomeRate
Mean perineal / recipient-site morbidity27%
Complete flap loss1.8%
Perineal hernia0.2%
Mean donor-site morbidity15%
Abdominal dehiscence5.5%
Incisional hernia (donor)3.3%

Major complications are uncommon despite the overall morbidity burden.

10-Year Series (77 Patients)[3]​

  • Donor-site hernia: 16.7%
  • Perineal hernia: 3.3%
  • DIEA flow maintained: 98.3%

Proctor 10-Year Experience[11]​

  • Clavien-Dindo ≥3 at donor site: 6%
  • Clavien-Dindo ≥3 at flap / perineal site: 18%
  • Smoking (P=0.003) and neoadjuvant radiotherapy (P=0.047) independently associated with flap complications
  • Flap complications significantly prolonged hospital stay

Predictors of VRAM Requirement vs Primary Closure[12]​

For APR specifically:

  • Current smoking
  • Anal tumor location
  • Prior abdominal surgery increases complication risk
  • Neoadjuvant chemoradiation strongly associated with any complication

Comparative Outcomes​

VRAM vs Gracilis​

Stein 2019 matched-cohort study:[13]

  • No difference in minor complications (44% gracilis vs 48% VRAM, P=0.8)
  • No difference in major complications (19% vs 13%, P=0.53)
  • Similar wound healing time
  • Muscle-only gracilis heals faster than musculocutaneous gracilis

Vulvo-perineal meta-analysis:[14]

  • VRAM significantly higher donor-site complications (pooled 57.6% vs 16.0% gracilis)
  • Similar recipient-site outcomes
  • No difference in minor or major recipient complications

Practical takeaway: comparable recipient outcomes; VRAM has substantially higher donor morbidity; gracilis better preserves continence in fistula repair.

VRAM vs IGAM (Inferior Gluteal Artery Myocutaneous)​

130-patient pelvic-exenteration series (97.7% previously irradiated):[15]

  • IGAM superior — lower flap failure, return-to-theatre, wound dehiscence
  • VRAM an alternative when IGAM unsuitable

VRAM vs Thigh Flaps (ALT-based)[16]​

  • Thigh flaps had greater major complications (42% vs 15%)
  • Higher cellulitis, pelvic abscess, major dehiscence
  • VRAM superior for pelvic reconstruction

VRAM vs IGAP (Inferior Gluteal Artery Perforator)[17]​

  • No significant difference in minor or major complications
  • Both viable options with comparable outcomes
  • IGAP preserves abdominal wall integrity

Risk Factors and Patient Selection​

Major modifiable risk factors:[11][12]

  • Smoking — strong predictor of flap complications (P=0.003)
  • Neoadjuvant radiotherapy — significant but unavoidable in most oncologic cases (P=0.047)
  • Prior abdominal surgery — assess for prior TRAM/DIEP harvest or vascular ligation, which may compromise the DIEA pedicle

Contraindications:

  • Prior TRAM / DIEP harvest on the intended side
  • Prior iliac or inferior epigastric vessel ligation
  • Severe abdominal-wall weakness or multiple prior laparotomies (consider alternative flap)

Consider alternatives:

  • IGAM in previously irradiated pelvic exenteration patients
  • Gracilis for continence-critical fistula repair
  • Omental flap for urosymphyseal fistula

Donor-Site Management​

The donor site is where most long-term morbidity resides.

  • Anterior rectus sheath closure with running non-absorbable (usually 0 PDS or equivalent).
  • Mesh reinforcement — biologic or synthetic — recommended in most cases given the 15–17% hernia rate even with careful primary closure.[3][7]
  • Drain for 24–72 h or until output is low.
  • Anterior sheath below arcuate line — the only aponeurotic layer; closure vulnerability is highest here.
  • Long-term hernia surveillance at follow-up visits.

Postoperative Imaging Findings​

Normal VRAM appearance on CT/MRI:[2]

  • Homogeneous soft-tissue density obliterating pelvic dead space
  • Enhancement pattern following the DIEA
  • Gradual fatty replacement of muscle over time (expected)

Complications to recognize:

  • Fluid collections → infection or seroma
  • Lack of enhancement → flap necrosis
  • Herniation at donor or recipient sites

Key Takeaways​

  1. VRAM is the workhorse pedicled flap for pelvic / perineal reconstruction after radical urologic oncology, particularly pelvic exenteration with radiation.
  2. Inferiorly based on the DIEA (originating from external iliac); pedicle 5–7 cm, artery 2–4 mm, DIEA flow maintained in 98.3% of flaps postoperatively.
  3. Rotation matters — 270° sagittal for anterior defects, 180° coronal for posterior defects — to avoid pedicle tension.
  4. Donor-site morbidity (~15%) and abdominal-wall hernia (~17% even with mesh) are the dominant long-term concerns.
  5. Smoking and neoadjuvant radiation are the principal complication drivers; counsel smokers explicitly.
  6. Choose VRAM when: you need abdominal-wall tissue + pelvic dead-space obliteration, and the abdominal wall is not already compromised.
  7. Choose alternatives when: continence is critical (gracilis), the patient is heavily irradiated in the pelvis (IGAM), the donor abdomen is compromised (gracilis, IGAP), or the indication is USF (omental).
  8. Muscle-sparing variants (MS-VRAM, cork flap) reduce donor morbidity while preserving flap function where possible.
  9. Robotic harvest is an emerging minimally invasive alternative that preserves the abdominal wall intact.

References​

1. Radwan RW, Tang AM, Harries RL, et al. "Vertical Rectus Abdominis Flap (VRAM) for Perineal Reconstruction Following Pelvic Surgery — A Systematic Review." J Plast Reconstr Aesthet Surg. 2021;74(3):523–529. doi:10.1016/j.bjps.2020.10.100

2. Sagebiel TL, Faria SC, Balachandran A, et al. "Pelvic Reconstruction With Omental and VRAM Flaps — Anatomy, Surgical Technique, Normal Postoperative Findings, and Complications." Radiographics. 2011;31(7):2005–19. doi:10.1148/rg.317115112

3. Kim E, Fernando C, McCombie A, et al. "Abdominal and Perineal Hernia Rates Following VRAM Flap Reconstruction — A Supraregional Experience." J Plast Reconstr Aesthet Surg. 2022;75(3):1158–1163. doi:10.1016/j.bjps.2021.11.002

4. Paprottka FJ, Krezdorn N, Lohmeyer JA, et al. "Plastic Reconstructive Surgery Techniques Using VRAM or Gracilis Flaps in Order to Successfully Treat Complex Urogenital Fistulas." J Plast Reconstr Aesthet Surg. 2016;69(1):128–37. doi:10.1016/j.bjps.2015.08.026

5. Escandón JM, Kreutz-Rodrigues L, Fadel AE, et al. "Optimizing Flap Selection for Urosymphyseal Fistula Repair — A Comparative Analysis of Surgical Outcomes." Microsurgery. 2026;46(3):e70197. doi:10.1002/micr.70197

6. Küntscher MV, Mansouri S, Noack N, Hartmann B. "Versatility of Vertical Rectus Abdominis Musculocutaneous Flaps." Microsurgery. 2006;26(5):363–9. doi:10.1002/micr.20253

7. Banuelos J, Kreutz-Rodrigues L, Mills AM, et al. "VRAM to Reconstruct Thigh and Groin Defects — A Retrospective Cohort and Systematic Review." J Plast Reconstr Aesthet Surg. 2022;75(6):1893–1901. doi:10.1016/j.bjps.2022.01.015

8. Chen Q, Dong R, Zeng A, et al. "The Reconstructive Strategy for Pelvic Oncological Surgery With Various Types of MS-VRAM Flaps." J Plast Reconstr Aesthet Surg. 2022;75(7):2090–2097. doi:10.1016/j.bjps.2022.02.014

9. Pérez-García A, García-Granero Á, Thione A, et al. "Extended VRAM for Reconstruction of Large Pelviperineal Defects Following Oncologic Resection." J Surg Oncol. 2022;126(8):1383–1388. doi:10.1002/jso.27068

10. Trapero A, Pérez-García A, Thione A, et al. "VRAM Flap Transposition in Pelviperineal Reconstruction — A Technical Note." J Plast Reconstr Aesthet Surg. 2022;75(10):3877–3903. doi:10.1016/j.bjps.2022.08.060

11. Proctor MJ, Westwood DA, Donahoe S, et al. "Morbidity Associated With the Immediate VRAM Reconstruction After Radical Pelvic Surgery." Colorectal Dis. 2020;22(5):562–568. doi:10.1111/codi.14909

12. Nichols DS, Satteson E, Harbor P, et al. "Factors Associated With the Use of VRAM Reconstruction Following APR for Anorectal Cancer." J Surg Oncol. 2020;122(5):923–927. doi:10.1002/jso.26086

13. Stein MJ, Karir A, Ramji M, et al. "Surgical Outcomes of VRAM Versus Gracilis Flaps for the Reconstruction of Pelvic Defects Following Oncologic Resection." J Plast Reconstr Aesthet Surg. 2019;72(4):565–571. doi:10.1016/j.bjps.2018.12.044

14. Eseme EA, Scampa M, Viscardi JA, et al. "Surgical Outcomes of VRAM vs Gracilis Flaps in Vulvo-Perineal Reconstruction Following Oncologic Resection — A Proportional Meta-Analysis." Cancers. 2022;14(17):4300. doi:10.3390/cancers14174300

15. Read T, Morrison EJ, Lonie S, Sheikh R, Chauhan A. "Treatment Outcomes After Pelvic Exenteration With IGAM or VRAM Flap Reconstruction — Review of 130 Consecutive Cases." J Plast Reconstr Aesthet Surg. 2025;103:140–147. doi:10.1016/j.bjps.2025.01.087

16. 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(1):175–183. doi:10.1097/PRS.0b013e3181904df7

17. Benedict KC, Songcharoen SJ, Stephens KL, et al. "Comparison of Inferior Gluteal Artery Perforator Flaps Versus VRAM Flaps in the Reconstruction of Perineal Wounds." J Plast Reconstr Aesthet Surg. 2023;84:514–520. doi:10.1016/j.bjps.2023.06.020

18. Guney G, Delara RM, Yi J, Erdemoglu E, Butler KA. "Robotic Rectus Muscle Flap Reconstruction After Pelvic Exenteration in Gynecological Oncology — Current and Future Perspectives." Cancers. 2026;18(3):375. doi:10.3390/cancers18030375

19. Combs PD, Sousa JD, Louie O, et al. "Comparison of Vertical and Oblique Rectus Abdominis Myocutaneous Flaps for Pelvic, Perineal, and Groin Reconstruction." Plast Reconstr Surg. 2014;134(2):315–323. doi:10.1097/PRS.0000000000000324

20. Davila AA, Goldman J, Kleban S, et al. "Reducing Complications and Expanding Use of Robotic Rectus Abdominis Muscle Harvest for Pelvic Reconstruction." Plast Reconstr Surg. 2022;150(1):190–195. doi:10.1097/PRS.0000000000009233

21. Asaad M, Pisters LL, Klein GT, et al. "Robotic Rectus Abdominis Muscle Flap Following Robotic Extirpative Surgery." Plast Reconstr Surg. 2021;148(6):1377–1381. doi:10.1097/PRS.0000000000008592

22. Bruce RG, El-Galley RE, Galloway NT. "Use of Rectus Abdominis Muscle Flap for the Treatment of Complex and Refractory Urethrovaginal Fistulas." J Urol. 2000;163(4):1212–1215.

23. Parsons JK, Tufaro A, Chang B, Schoenberg MP. "Rectus Abdominis Vaginoplasty After Anterior Exenteration for Urologic Malignancy." Urology. 2003;61(6):1249–1252; discussion 1253. doi:10.1016/s0090-4295(03)00147-x

24. Smith EA, Kaye JD, Lee JY, Kirsch AJ, Williams JK. "Use of Rectus Abdominis Muscle Flap as Adjunct to Bladder Neck Closure in Patients With Neurogenic Incontinence: Preliminary Experience." J Urol. 2010;183(4):1556–1560. doi:10.1016/j.juro.2009.12.044

25. Horton CE, Sadove RC, Jordan GH, Sagher U. "Use of the Rectus Abdominis Muscle and Fascia Flap in Reconstruction of Epispadias / Exstrophy." Clin Plast Surg. 1988;15(3):393–397.