Medialization after combined anterior and posterior component separation in giant incisional hernia surgery, an anatomical study

Primary ventral and incisional hernias: comprehensive review

BACKGROUND

Primary ventral and incisional hernias are frequent conditions that impact the quality of life of patients. Surgical techniques for ventral hernia repair are constantly evolving and abdominal wall surgery has turned into a highly specialized field.

METHODS

This is a narrative review of the most recent and relevant literature on the treatment of primary ventral and incisional hernias performed by eight experts in ventral hernia surgery from across the world and includes review of classification systems, preoperative measures, descriptions of surgical techniques, and postoperative complications.

RESULTS

Repairs of primary ventral and incisional hernias range from simple open procedures in healthy patients with small defects to complex procedures when patients are co-morbid and have large defects. Optimizing patient-related risk factors before surgery is important to decrease complication rates. Surgical repair techniques from open repairs to minimally invasive procedures are described in detail in the review. Minimally invasive techniques are technically more demanding and take longer, but decrease the risk of surgical-site infections and shorten the duration of hospital stay.

CONCLUSION

Treatment of ventral hernias aims to improve the quality of life of patients. The risks and benefits of procedures should be weighed against patients' complaints and co-morbidities. Optimizing patient-related risk factors before surgery is important.

Assessment of myofascial medialization following intraoperative fascial traction (IFT) in a cadaveric model

PURPOSE

Intraoperative fascial traction (IFT) for the treatment of large ventral hernias and loss of domain (LOD) hernias is a promising tool in abdominal wall surgery. However, little is known about the extent of gain in myofascial advancement especially for the anterior rectus sheath. We, therefore, used a cadaveric model to determine the medialization during IFT.

METHODS

4 fresh frozen specimens were used. Retromuscular preparation was carried out followed by IFT with diagonal vertical traction for 30 min. Medial advancement of the anterior rectus sheath was measured after 15 and 30 min as well as traction forces.

RESULTS

Total medialization for anterior rectus sheath after 30 min of IFT was 10.5 cm (mean). The mean traction force was 16.28 kg. Total medialization was significantly higher during the first 15 min of vertical fascial traction (p < 0.05).

CONCLUSIONS

IFT provides significant medialization for the anterior rectus sheath in the cadaveric model. The findings align with results from a retrospective case study. Therefore, we see IFT as a beneficial tool in abdominal wall surgery.

Limitations of Transversus Abdominis Release (TAR)-Additional Bridging of the Posterior Layer And/Or Anterior Fascia Is the Preferred Solution in Our Clinical Routine If Primary Closure is Not Possible

Background: By separating the abdominal wall, transversus abdominis release (TAR) permits reconstruction of the abdominal wall and the placement of large mesh for many types of hernias. However, in borderline cases, the mobility of the layers is inadequate, and additional bridging techniques may be required for tension-free closure. We now present our own data in this regard. Patients and Methods: In 2023, we performed transversus abdominis release on 50 patients as part of hernia repair. The procedures were carried out using open (n = 25), robotic (n = 24), and laparoscopic (n = 1) techniques. The hernia sac was always integrated into the anterior suture and, in the case of medial hernias, was used for linea alba reconstruction. Results: For medial hernias, open TAR was performed in 22 cases. Additional posterior bridging was performed in 7 of these cases. The ratio of mesh size in the TAR plane to the defect area (median in cm) was 1200cm2/177 cm2 = 6.8 in patients without bridging, and 1750cm2/452 cm2 = 3.8 in those with bridging. The duration of surgery (median in min) was 139 and 222 min and the hospital stay was 6 and 10 days, respectively. Robotic TAR was performed predominantly for lateral and parastomal hernias. These procedures took a median of 143 and 242 min, and the hospital stay was 2 and 3 days, respectively. For robotic repair, posterior bridging was performed in 3 cases. Discussion: Using the TAR technique, even complex hernias can be safely repaired. Additional posterior bridging provides a reliable separation of the posterior plane from the intestines. Therefore, the hernia sac is always available for anterior reconstruction of the linea alba. The technique can be implemented as an open or minimally invasive procedure.

EIT Ambivium, Linea Semilunaris, and Fulcrum Abdominalis

Building upon the recent advancements in posterior component separation techniques for complex abdominal wall hernia repair, highlights the critical importance of a thorough understanding of the abdominal wall anatomy. To address anatomical concepts with a pivotal role in hernia repair, we propose two new terminologies: "EIT Ambivium" referring to the lateral border of the rectus sheath, and "Fulcrum Abdominalis" demarcating the point where the Linea Arcuata intersects with the EIT Ambivium.

Five-Year Follow-Up of a Slowly Resorbable Biosynthetic P4HB Mesh (Phasix) in VHWG Grade 3 Incisional Hernia Repair

Objective

To assess the 5-year recurrence rate of incisional hernia repair in Ventral Hernia Working Group (VHWG) 3 hernia with a slowly resorbable mesh.

Summary Background Data

Incisional hernia recurs frequently after initial repair. In potentially contaminated hernia, recurrences rise to 40%. Recently, the biosynthetic Phasix mesh has been developed that is resorbed in 12-18 months. Resorbable meshes might be a solution for incisional hernia repair to decrease short- and long-term (mesh) complications. However, long-term outcomes after resorption are scarce.

Methods

Patients with VHWG grade 3 incisional midline hernia, who participated in the Phasix trial (Clinilcaltrials.gov: NCT02720042) were included by means of physical examination and computed tomography (CT). Primary outcome was hernia recurrence; secondary outcomes comprised of long-term mesh complications, reoperations, and abdominal wall pain [visual analogue score (VAS): 0-10].

Results

In total, 61/84 (72.6%) patients were seen. Median follow-up time was 60.0 [interquartile range (IQR): 55-64] months. CT scan was made in 39 patients (68.4%). A recurrence rate of 15.9% (95% confidence interval: 6.9-24.8) was calculated after 5 years. Four new recurrences (6.6%) were found between 2 and 5 years. Two were asymptomatic. In total, 13/84 recurrences were found. No long-term mesh complications and/or interventions occurred. VAS scores were 0 (IQR: 0-2).

Conclusions

Hernia repair with Phasix mesh in high-risk patients (VHWG 3, body mass index >28) demonstrated a recurrence rate of 15.9%, low pain scores, no mesh-related complications or reoperations for chronic pain between the 2- and 5-year follow-up. Four new recurrences occurred, 2 were asymptomatic. The poly-4-hydroxybutyrate mesh is a safe mesh for hernia repair in VHWG 3 patients, which avoids long-term mesh complications like pain and mesh infection.

Surgical Anatomy of Transversus Abdominis Muscle for Transversus Abdominis Release: A CT-Based Study in Three Patient Groups

BACKGROUND

The anatomy of the transversus abdominis muscle and its aponeurosis is important in transversus abdominis release surgery. We studied the CT anatomy of the transversus abdominis muscle medial to the linea semilunaris at different levels in the abdomen and measured the thickness of this muscle.

METHODS

In this retrospective study, we analysed 150 abdominal computed tomography at L1, L3, and L5 vertebral levels corresponding to subxiphoid, umbilical, and suprapubic regions, respectively. The patients were divided into three groups based on age and sex: women aged 15-20 years (nulliparous), women aged 30-60 years (multiparous), and men aged 15-60 years, with each group having 50 patients. We compared the thickness of the TA muscle at the L1 level between men and women and between nulliparous and multiparous women.

RESULTS

Transversus abdominis muscle was consistently present medial to the linea semilunaris at L1 vertebral level in the subxiphoid region (150/150). At the L3 vertebral level in the mid-abdomen, only eight patients had the transversus abdominis muscle there (8/150, 5%). At the L5 vertebral level in the suprapubic region, no patient had the transversus abdominis muscle medial to the linea semilunaris. The mean thickness of the transversus abdominis muscle at the L1 level was 3.4 mm, and at the L3 level, it was 1.6 mm. There was no statistically significant difference in the transversus abdominis muscle thickness between the men and women; however, a significant difference was found between the nulliparous and multiparous women, with thinner TA muscle in later.

CONCLUSION

There is good transversus abdominis muscle bulk medial to the linea semilunaris for doing transversus abdominis muscle division in the upper abdomen. However, as we move towards the mid-abdomen, we have TA aponeurosis or rarely TA muscle of little bulk.

Biomechanical stability of hernia-damaged abdominal walls

Hernia occurs when the peritoneum and/or internal organs penetrate through a defect in the abdominal wall. Implanting mesh fabrics is a common way to reinforce the repair of hernia-damaged tissues, despite the risks of infection and failure associated with them. However, there is neither consensus on the optimum mesh placement within the abdominal muscles complex nor on the minimum size of hernia defect that requires surgical correction. Here we show that the optimum position of the mesh depends on the hernia location; placing the mesh on the transversus abdominis muscles reduces the equivalent stresses in the damaged zone and represents the optimum reinforcement solution for incisional hernia. However, retrorectus reinforcement of the linea alba is more effective than preperitoneal, anterectus, and onlay implantations in the case of paraumbilical hernia. Using the principles of fracture mechanics, we found that the critical size of a hernia damage zone becomes severe at 4.1 cm in the rectus abdominis and at larger sizes (5.2-8.2 cm) in other anterior abdominal muscles. Furthermore, we found that the hernia defect size must reach 7.8 mm in the rectus abdominis before it influences the failure stress. In other anterior abdominal muscles, hernia starts to influence the failure stress at sizes ranging from 1.5 to 3.4 mm. Our results provide objective criteria to decide when a hernia damage zone becomes severe and requires repair. They demonstrate where mesh should be implanted for a mechanically stable reinforcement, depending on the type of hernia. We anticipate our contribution to be a starting point for sophisticated models of damage and fracture biomechanics. For example, the apparent fracture toughness is an important physical property that should be determined for patients living with different obesity levels. Furthermore, relevant mechanical properties of abdominal muscles at various ages and health conditions would be significant to generate patient specific results.

Morphological alterations of the abdominal wall after open incisional hernia repair with endoscopic anterior and open posterior component separation

PURPOSE

Effects of component separation (CS) on abdominal wall morphology have only been investigated in smaller case series or cadavers. This study aimed to compare abdominal wall alterations following endoscopic anterior CS (EACS) or open transverse abdominis release (TAR).

METHODS

Computed tomography scans were evaluated in patients who had undergone open incisional hernia repair with EACS or TAR. Abdominal wall circumference, lateral abdominal wall muscle thickness, and displacement were compared with (1) preoperative images after bilateral CS and (2) the undivided side postoperatively after unilateral CS.

RESULTS

In total, 105 patients were included. Fifty-five (52%) and 15 (14%) underwent bilateral and unilateral EACS, respectively. Five (5%) and 14 (13%) underwent bilateral and unilateral TAR, respectively. Sixteen (15%) underwent unilateral EACS and contralateral TAR. The external oblique and transverse abdominis muscles were significantly laterally displaced with a mean of 2.74 cm (95% CI 2.29-3.19 cm, P < 0.001) and 0.82 cm (0.07-1.57 cm, P = 0.032) after EACS and TAR, respectively. The combined thickness of the lateral muscles was significantly decreased after EACS (mean decrease 10.5% (5.8-15.6%, P < 0.001)) and insignificantly decreased after TAR (mean decrease 2.6% (- 4.8 to 9.5%, P = 0.50)). The abdominal wall circumference was unchanged after bilateral (mean reduction 0.90 cm (- 0.77 to 2.58 cm), P = 0.29) and unilateral CS (mean increase 0.03 cm (- 1.01 to 1.08 cm), P = 0.95).

CONCLUSION

Postoperative changes in the lateral abdominal wall musculature were different following EACS and open TAR. Either technique seems not to compromise the overall integrity of the lateral abdominal wall.

EVOLUTION OF COMPONENT SEPARATION TECHNIQUE (REVIEW)

The problem of treatment of incisional ventral hernias is currently very relevant. The appearance of a hernial defect in the area of a previous operation is one of the most frequent long-term complications of any surgical treatment. Component separation techniques are the most modern and promising methods for the treatment of large ventral hernias. The review focuses on the main stages in the development of separation technique, as well as the results of treating patients with incisional ventral hernias using various options for posterior separation repair, which are currently frequently used. It has been established that posterior component separation is an effective and safe method of treatment, however, there is currently insufficient data on the long-term postoperative period and patients quality of life.

When transversus abdominis release (TAR) is not enough during the repair of large midline incisional hernias: the double peritoneal flap to the rescue

Transversus abdominis release (TAR) is becoming an increasingly popular approach to incisional hernia repair. As the technique has been applied to more complex hernias, it appears insufficient for repairing large defects due to the impossibility to achieve a tension-free reapproximation of the peritoneum and/or the linea alba, then a bridged repair with interposed omentum, reabsorbable or coated prosthesis frequently leaving the mesh in contact with the subcutaneous space, has been proposed. To overcome these setbacks, we have developed the double peritoneal flap-TAR (DPF-TAR) technique, which entails placement of a retromuscular mesh completely isolated from either peritoneal cavity and subcutaneous space by joining both peritoneal sac halves into a double-bridged design. Of 19 patients, 17 (89%) were available for the study. Median transverse diameter of the hernia was 13,3 cm (10-17), and 10 (53%) cases had a complete failure of the linea alba. Five (26%) patients developed a surgical site occurrence (SSO). With a median follow-up of 11 (4-28) months, one (5,8%) recurrence and four (23,5%) wound bulging were diagnosed. We suggest that DPF-TAR approach can provide an effective repair using native tissues to isolate the retromuscular mesh, with acceptable failure and SSOs rates. By avoiding the need for a steep learning curve, this method may constitute a handy complement to the surgeon's armory for difficult reconstructions of the abdominal wall.

Favourable outcomes after Retro-Rectus (Rives-Stoppa) Mesh Repair as Treatment for Non-Complex Ventral Abdominal Wall Hernia, a Systematic Review and Meta-Analysis

OBJECTIVE

To assess prevalence of hernia recurrence, surgical site infection (SSI), seroma, serious complications, and mortality after retro-rectus repair.

SUMMARY BACKGROUND DATA

Ventral abdominal wall hernia is a common problem, tied to increasing frailty and obesity of patients undergoing surgery. For non-complex ventral hernia, retro-rectus (Rives-Stoppa) repair is considered the gold standard treatment. Level-1 evidence confirming this presumed superiority is lacking.

METHODS

Five databases were searched for studies reporting on retro-rectus repair. Single-armed and comparative randomized and non-randomized studies were included. Outcomes were pooled with mixed-effects, inverse variance or random-effects models.

RESULTS

Ninety-three studies representing 12440 patients undergoing retro-rectus repair were included. Pooled hernia recurrence was estimated at 3.2% (95%CI: 2.2-4.2%, n = 11049) after minimally 12 months and 4.1%, (95%CI: 2.9-5.5%, n = 3830) after minimally 24 months. Incidences of SSI and seroma were estimated at respectively 5.2% (95%CI: 4.2-6.4%, n = 4891) and 5.5% (95%CI: 4.4-6.8%, n = 3650). Retro-rectus repair was associated with lower recurrence rates compared to onlay repair (OR: 0.27, 95%CI: 0.15-0.51, p < 0.001) and equal recurrence rates compared to intraperitoneal onlay (IPOM) repair (OR: 0.92, 95%CI: 0.75-1.12, p = 0.400). Retro-rectus repair was associated with more SSI than IPOM repair (OR: 1.8, 95%CI: 1.03-3.14, p = 0.038). Minimally invasive retro-rectus repair displayed low rates of recurrence (1.3%, 95%CI: 0.7-2.3%, n = 849) and SSI (1.5%, 95%CI: 0.8-2.8%, n = 982), albeit based on non-randomized studies.

CONCLUSIONS

Retro-rectus (Rives-Stoppa) repair results in excellent outcomes, superior or similar to other techniques for all outcomes except surgical site infection. The latter rarely occurred, yet less frequently after IPOM repair, which is usually performed by laparoscopy.