Rectus diastasis (RD) associated with abdominal hernias present a surgical challenge associated with a paucity in treatment guidelines. The objective of this systematic review is to review surgical techniques and assess complication and recurrence rates of RD in patients with concurrent abdominal hernias. PubMed and EMBASE databases were systematically searched, and data extraction was performed on articles which met the inclusion criteria. Pooled analyses of complication and recurrence rates were performed to compare open vs. minimally invasive surgery. Student t tests were performed to compare differences in continuous outcomes. Twenty-eight studies were included in this review. RD can be surgically repaired by both open and laparoscopic approaches using both non-absorbable and absorbable sutures. The majority of the techniques reported included mesh insertion either above the aponeurosis, retromuscular, preperitoneal, or intraperitoneal. Open techniques, compared to laparoscopic approaches, were associated with a significantly higher rate of skin dehiscence (6.79% vs. 2.86%; p = 0.003) and hematoma formation (4.73% vs. 1.09%; p < 0.001) and a significantly lower rate of post-operative seroma formation (2.47% vs. 8.29%; p < 0.001). No significant difference in RD recurrence rates were observed between open and laparoscopic repair (0.22 vs. 0.63%, p = 0.17). Both open and laparoscopic surgery are safe and effective methods that can be used to repair RD in patients with RD and concurrent abdominal hernias as evident by the low recurrence and complication rates and almost negligible major complications post repair.

Closing the gap: evidence-based surgical treatment of rectus diastasis associated with abdominal wall hernias

Prevalence of rectus diastasis is higher in patients with inguinal hernia.

The aim of this study was to analyse the risk for reoperation following primary ventral hernia repair.The study was based on umbilical hernia and epigastric hernia repairs registered in the population-based Swedish National Patient Register (NPR) 2010-2019. Reoperation was defined as repeat repair after primary repair.Altogether 29,360 umbilical hernia repairs and 6514 epigastric hernia repairs were identified. There were 624 reoperations registered following primary umbilical repair and 137 following primary epigastric repairs. In multivariable Cox proportional hazard analysis, the hazard ratio (HR) for reoperation was 0.292 (95% confidence interval (CI) 0.109-0.782) after open onlay mesh repair, 0.484 (CI 0.366-0.641) after open interstitial mesh repair, 0.382 (CI 0.238-0.613) after open sublay mesh repair, 0.453 (CI 0.169-1.212) after open intraperitoneal onlay mesh repair, 1.004 (CI 0.688-1.464) after laparoscopic repair, and 0.940 (CI 0.502-1.759) after other techniques, when compared to open suture repair as reference method. Following umbilical hernia repair, the risk for reoperation was also significantly higher for patients aged < 50 years (HR 1.669, CI 1.389-2.005), for women (HR 1.401, CI 1.186-1.655), and for patients with liver cirrhosis (HR 2.544, CI 1.049-6.170). For patients undergoing epigastric hernia repair, the only significant risk factor for reoperation was age < 50 years (HR 2.046, CI 1.337-3.130).All types of open mesh repair were associated with lower reoperation rates than open suture repair and laparoscopic repair. Female sex, young age and liver cirrhosis were risk factors for reoperation due to hernia recurrence, regardless of method. 

https://link.springer.com/content/pdf/10.1007/s10029-022-02645-3.pdf

Long-term reoperation rate following primary ventral hernia repair: a register-based study

Rectus abdominis diastasis (RAD) ± concomitant hernia is a complex hernia entity of growing significance in everyday clinical practice. Due to a multitude of described surgical techniques, a so far missing universally accepted classification and hardly existing comparative studies, there are no clear recommendations in guidelines. Therefore, “RAD ± concomitant hernia” will be documented as a separate hernia entity in the Herniamed Registry in the future. For this purpose, an appropriate case report form will be developed on the basis of the existing literature. A systematic search of the available literature was performed in March 2021 using Medline, PubMed, Google Scholar, Scopus, Embase, Springer Link, and the Cochrane Library. 93 publications were identified as relevant for this topic. In total 45 different surgical techniques for the repair of RAD ± concomitant hernia were identified in the surgical literature. RAD ± concomitant hernia is predominantly repaired by plastic but also by general surgeons. Classification of RAD ± concomitant hernia is based on a proposal of the German Hernia Society and the International Endohernia Society. Surgical techniques are summarized as groups subject to certain aspects: Techniques with abdominoplasty, open techniques, mini-less-open and endoscopic sublay techniques, mini-less-open and endoscopic subcutaneous/preaponeurotic techniques and laparoscopic techniques. Additional data impacting the outcome are also recorded as is the case for other hernia entities. Despite the complexity of this topic, documentation of RAD ± concomitant hernia has not proved to be any more cumbersome than for any of the other hernia entities when using this classification. Using the case report form described here, the complex hernia entity RAD ± concomitant hernia can be recorded in a registry for proper analysis of comparative treatment options.

Comparison of outcomes in rectus abdominis diastasis repair—which data do we need in a hernia registry?

The Italian national consensus conference on the diagnosis and treatment of Rectus Abdominis diastasis in Post-gravidic Women

Introduction Rectus abdominis diastasis (RAD) is characterized by thinning and widening of the linea alba and laxity of the ventral abdominal muscle. RAD, when coexistent with umbilical hernia, is considered a risk factor for hernia recurrence. We investigated the impact of comorbid RAD in patients with umbilical hernia who had undergone hernia repair. Methods We enrolled 30 patients who had undergone umbilical hernia repair using either a laparoscopic or anterior approach between April 2006 and May 2018. We diagnosed RAD according to preoperative CT. The outcomes of patients with umbilical hernia, the RAD group, and the non-RAD group were compared, especially in terms of recurrence. Results Twenty-five patients (83%) presented with RAD, including three patients (12%) with postoperative recurrence who were allocated to the RAD group. The median BMI in the RAD group was 27.2 kg/m2 . In the RAD group, a prosthesis mesh was used in 12 patients (48%), and nonabsorbable suture material was used in four patients (16%). There was no statistically significant difference between the two groups in terms of age, hernial orifice diameter, surgical technique, or operative time. Conclusion The rate of comorbid umbilical hernia in Japanese patients with RAD was high, as was the recurrence rate of umbilical hernia. We strongly recommend preoperative detection of RAD. We also recommend mesh-based repair of the midline and nonabsorbable suture material to decrease the recurrence rate, irrespective of hernia size.

Comorbid rectus abdominis diastasis is a risk factor for recurrence of umbilical hernia in Japanese patients.

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Comorbid rectus abdominis diastasis is a risk factor for recurrence of umbilical hernia in Japanese patients.