This protocol describes a step-by-step procedure for harvesting a vascularized and reinnervated abdominal wall allograft, detailing its anatomic landmarks, technical requirements, and future potential clinical applications.
Method Article
This protocol describes a step-by-step procedure for harvesting a vascularized and reinnervated abdominal wall allograft, detailing its anatomic landmarks, technical requirements, and future potential clinical applications.
Extensive and complex abdominal wall defects, particularly those associated with intestinal or visceral organ damage, pose significant medical and surgical challenges. An ideal reconstruction must restore anatomy, function, sensation, and body image. Currently, no conventional reconstruction method fulfills all these criteria in such complex scenarios. However, vascularized composite allotransplantation (VCA) offers a unique solution, providing satisfactory anatomical and functional outcomes -- albeit at the cost of lifelong immunosuppression.
Since the first reported human case in 2003, approximately 40 abdominal wall transplants have been performed worldwide, all in conjunction with intestinal or multivisceral transplantation. While various technical adaptations have been described, the procedure has proven to be both safe and effective for patients with complex abdominal wall defects. To date, no reinnervated abdominal wall allograft has been attempted in humans. However, reinnervation appears to be the next frontier, with the potential to enhance functional outcomes and reduce complications.
This protocol outlines a standardized procedure for harvesting and preparing a vascularized abdominal wall composite allograft, designed to ensure optimal results and minimize tissue damage. The graft, vascularized via the deep inferior epigastric vessels, is harvested with generous margins to enable tension-free reconstruction. We also detail the specific steps required to collect an innervated specimen. At the end of the procedure, the two deep inferior epigastric arteries are cannulated, and the graft is perfused with preservation solution for transport. Ultimately, this protocol aims to standardize abdominal wall graft procurement. It is intended as a valuable resource for both translational research and clinical applications, particularly as interest in abdominal wall transplantation continues to grow.
Successful closure of the abdominal wall following intestinal transplantation (ITx) or multivisceral transplantation (MVTx) presents a significant challenge for reconstructive surgeons due to various factors -- such as the limited volume of the recipient's abdominal cavity, morphological discrepancies between donor and recipient, postoperative edema, a scarred abdomen, and the presence of multiple enterocutaneous fistulas1,2,3,4,5,6.
Over the past few decades, several techniques for abdominal closure have been proposed to address or at least mitigate the complications associated with complex abdominal defects. These include the use of synthetic meshes, skin expansion, negative pressure therapy, and pedicled or free flaps2,6,7,8,9,10,11,12,13.
However, when conventional methods are not feasible, two alternative strategies may be considered: selecting a donor with smaller organs, though this can increase waiting times and the risk of mortality for patients on transplant lists (Fishbein et al. reported an ideal donor-to-recipient weight ratio between 0.76 and 1.1)14 or proposing an associated abdominal wall transplant.
This concept was first introduced by Levi et al. in 200315 and later improved with a microvascular version by Cipriani et al.16. It is a feasible and safe procedure with numerous advantages, particularly given that immunosuppression is already required for intestinal or multivisceral transplants. It is, however, crucial to screen for donor contraindications, such as a history of abdominal hernias or bulges, prior intra-abdominal surgeries, or obesity.
A major benefit of abdominal wall allotransplantation is the ability to monitor immunosuppression and rejection through the skin component of the graft, which serves as both an immune modulator and a visible sentinel of host immune activity. This offers a valuable tool for early detection of intestinal graft rejection and, more importantly, helps avoid unnecessary over-immunosuppression in cases of graft dysfunction unrelated to immune rejection17,18.
Despite its promise, abdominal wall allotransplantation remains a rare surgical intervention, with only about forty cases reported worldwide19,20. These cases are described mainly through case series and reviews5,15,16,19,20,21,22,23,24,25,26,27,28,29,30. Furthermore, literature on the procurement of reinnervated abdominal wall grafts is extremely limited; to date, no such procedures have been performed in living human subjects31. However, reinnervation is expected to significantly enhance functional outcomes27. This article aims to provide a step-by-step protocol for the procurement of an abdominal wall allograft-including the technical specifics of its reinnervated variant.
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The Anatomy Laboratory of the Faculty of Medicine in Nice, France, generously provided the specimens and materials used in this study. The research was approved by the French National Ethics Committee (approval number 83.2024) and conducted in accordance with the principles of the Declaration of Helsinki.
The abdominal wall allograft, roughly pentagonal in shape, extends from the xiphoid process to the pubic symphysis. It includes, in a single block, the skin and subcutaneous tissue, both rectus abdominis muscles, portions of the internal, external, and transversus abdominis muscles, the deep muscular fascia, the transversalis fascia, and the parietal peritoneal fascia. The graft is vascularized by the bilateral deep inferior epigastric vessels, which are transected proximally at their origin from the external iliac vessels.
1. Preoperative drawing (Figure 1)

Figure 1: Preoperative drawing. The continuous blue line represents the surgical skin incision of the abdominal wall allotransplantation. (1) xiphoid process, (2) lower costal margin, (3) anterosuperior iliac spine, (4) inguinal ligament, (5) pubic symphysis. Please click here to view a larger version of this figure.
2. Upper incision (Figure 2)

Figure 2: Upper Incision. The upper detachment of the abdominal allograft allows visualization of the abdominal wall muscles. (1) left rectus abdominis muscle, (2) right rectus abdominis muscle, (3) white line, (4) deep muscular aponeurosis. Please click here to view a larger version of this figure.
3. Lateral incisions (Figure 3)

Figure 3: Lateral Incision and identification of thoracolumbar nerves. The lateral dissection shows the thoracolumbar nerves running between the internal oblique and transverse abdominis muscles. The allograft is raised from cranial to caudal. (1) right thoracolumbar nerve n°1, (2) right thoracolumbar nerve n°2, (3) right thoracolumbar nerve n°3, (4) right thoracolumbar nerve n°4, (5) left thoracolumbar nerve n°1, (6) left thoracolumbar nerve n°2, (7) left thoracolumbar nerve n°3, (8) left thoracolumbar nerve n°4, (9) right internal oblique muscle, (10) left internal oblique muscle, (11) right external oblique muscle, (12) left external oblique muscle, (13) right rectus abdominis muscle, (14) left rectus abdominis muscle, (15) parietal peritoneal fascia. Please click here to view a larger version of this figure.
4. Release of the allograft from cranial to caudal
5. Lower incision and pedicle dissection (Figure 4, Figure 5, and Figure 6)

Figure 4: Allograft vascularization. This anterior view exposes all the vessels (arteries and veins) and nerves that need to be identified. In the background, in the abdominal cavity, we can see the abdominal organs. (1) right thoracolumbar nerve n°1, (2) right thoracolumbar nerve n°2, (3) right thoracolumbar nerve n°3, (4) right thoracolumbar nerve n°4, (5) left thoracolumbar nerve n°1, (6) left thoracolumbar nerve n°2, (7) left thoracolumbar nerve n°3, (8) left thoracolumbar nerve n°4, (9) right external iliac artery, (10) left external iliac artery, (11) right deep epigastric inferior artery, (12) left deep epigastric inferior artery, (13) right deep epigastric inferior vein, (14) left deep epigastric inferior vein, (15) right external iliac vein, (16) left external iliac vein, (17) right deep circumflex iliac artery, (18) left deep circumflex iliac artery, (19) right superficial circumflex iliac artery, (20) right superficial epigastric inferior artery, (21) common trunk of left superficial epigastric inferior artery and left superficial circumflex iliac artery. Please click here to view a larger version of this figure.

Figure 5: Allograft vascularization (left side). On this left side view, we can see four thoracolumbar nerves. Moreover, in that case, there is a common trunk between the left superficial epigastric inferior artery and the left superficial circumflex iliac artery. (1) left thoracolumbar nerve n°1, (2) left thoracolumbar nerve n°2, (3) left thoracolumbar nerve n°3, (4) left thoracolumbar nerve n°4, (5) left external iliac artery, (6) left deep epigastric inferior artery, (7) left deep epigastric inferior vein, (8) left external iliac vein, (9) left deep circumflex iliac artery, (10) common trunk of left superficial epigastric inferior artery and left superficial circumflex iliac artery. Please click here to view a larger version of this figure.

Figure 6: Allograft vascularization (right side). On this right side view, we can see four thoracolumbar nerves. Here, the right superficial epigastric inferior artery and the right superficial circumflex iliac artery begin separately from the femoral artery. (1) right thoracolumbar nerve n°1, (2) right thoracolumbar nerve n°2, (3) right thoracolumbar nerve n°3, (4) right thoracolumbar nerve n°4, (5) right external iliac artery, (6) right deep epigastric inferior artery, (7) right deep epigastric inferior vein, (8) right external iliac vein, (9) right deep circumflex iliac artery, (10) right superficial circumflex iliac artery, (11) right superficial epigastric inferior artery. Please click here to view a larger version of this figure.
6. Graft weaning and conditioning (Figure 7)

Figure 7: Free abdominal allograft. The left image shows the deep side of the free allograft, and the right image shows the superficial side of the free allograft. This abdominal wall allotransplantation is now ready to receive the preservation solution and to be transported. (1) left thoracolumbar nerve n°1, (2) left thoracolumbar nerve n°2 left, (3) left thoracolumbar nerve n°3, (4) left thoracolumbar nerve n°4 left, (5) right thoracolumbar nerve n°1, (6) right thoracolumbar nerve n°2, (7) right thoracolumbar nerve n°3, (8) right thoracolumbar nerve n°4, (9) left deep epigastric inferior artery, (10) right deep epigastric inferior artery, (11) left deep epigastric inferior vein, (12) right deep epigastric inferior vein, (13) left deep circumflex iliac artery, (14) right deep circumflex iliac artery, (15) common trunk of left superficial epigastric inferior artery and left superficial circumflex iliac artery, (16) right superficial circumflex iliac artery, (17) right superficial epigastric inferior artery, (18) left rectus abdominis muscle, (19) right rectus abdominis muscle, (20) arcuate line. Please click here to view a larger version of this figure.
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The donor body dissected for this study was a female subject measuring 1.69 m in height and presenting a standard body morphology. The harvested abdominal wall allograft measured 40 cm in height and 21 cm in width, with a relatively uniform thickness of 43 mm.
On each side, four thoracolumbar nerves of good caliber (approximately 1 mm in diameter) were successfully isolated. These nerves were dissected laterally within the anatomical plane between the internal oblique and transverse abdominis ...
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According to current literature, abdominal wall allotransplantation has proven to be an effective reconstructive option in complex organ transplantation settings. The current indications for this surgical technique remain limited to cases where conventional methods of abdominal wall reconstruction are not feasible during intra-abdominal organ transplantation. These include situations such as a multi-scarred and fibrotic abdomen resulting from repeated abdominal surgeries, the presence of multiple enterocutaneous fistulas...
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The authors have no conflicts of interest to declare.
The authors wish to express their sincere gratitude to the individuals who generously donated their bodies to science, thereby enabling anatomical research. The insights gained from such studies have the potential to significantly advance scientific knowledge and improve patient care. As such, these donors and their families deserve our deepest appreciation.
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| Name | Company | Catalog Number | Comments |
|---|---|---|---|
| 11.5” Medium Premium Surgiclip II Auto Suture vessel clip applier | Covidien | ||
| 2-0 silk suture | |||
| Adson Forceps | MPM | 106-2112A | |
| Bipolar Coagulation Forceps | Olsen | 20-1320I | |
| Custodiol HTK Solution for limb perfusion | Essential Pharmaceuticals Inc. | off-label use | |
| Cysto/ Bladder Irrigation Set | Baxter Healthcare Corp. | ||
| Disposable Scalpel #15 | Sklar | ||
| DLP 3 mm vessel cannula blunt tip | Medtronic Inc | ||
| Fine needle cautery | Cormedica | ||
| Forceps Dilators | WPI | 15910 | |
| IV stopcock | |||
| Micro scissors | WPI | 504492 | |
| Monopolar Diathermy | Valleylab | ||
| Oscillating saw | GPC Medical | ||
| Saline solution 0,9% | GenDepot | S0600-101 | |
| Sterile Esmarch bandage | |||
| Sterile surgical marking pen | Cardinal health | 212PR | |
| Strabismus scissors | Surtex | 102-4109 | |
| Sutures Ethilon 4.0 | Ethicon | 1667G | |
| Syringe 10 mL | Agilent | 9301-6474 | |
| Three sterile procurement plastic bags, and three sterile zip ties | |||
| Tissue Forceps | MPM | 106-0511 | |
| Vessel loop | Deroyal | 30-711 |
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