Intraperitoneal Underlay Mesh (IPUM) repair is a minimally invasive procedure used in hernia repair, particularly for ventral hernias, umbilical hernias, and incisional hernias. It involves placing a surgical mesh directly against the peritoneum—the inner lining of the abdomen—on the inner surface of the abdominal wall to cover and reinforce the closed hernia defect. IPUM is typically performed using minimally invasive techniques which allows the surgeon to access the affected area through small incisions, minimizing trauma and expediting recovery.
This technique has gained widespread use in the United States and globally due to its favorable outcomes in selected patients. However, as data and clinical trial outcomes evolve, the technique continues to be compared with other hernia repair methods through systematic review, meta-analysis, and randomized controlled trial designs.
Technique Overview and Surgical Methodology
During an IPUM procedure, the hernia sac is first reduced and the defect in the muscle—is either left open or closed with surgical suture in a variant called IPUM-plus. IPUM-plus is generally preferred as not closing the defect can increase recurrence rates and can still result in bulging. A mesh is then placed as an underlay within the peritoneal cavity, directly contacting intra-abdominal structures. Meshes used in this type of repair are typically coated with a barrier to reduce the risk of adhesions and erosions into the intestines. This contrasts with sublays and onlays in other anatomical contexts, where placement may occur between muscle layers or above muscle layers.
The mesh is secured using tacks or transfascial suture, and careful placement is essential to minimize the risk of adhesion, infection, or unintentional injury to organs. The International Endohernia Society has issued detailed guidance on procedural technique, suture choice, and fixation strategies based on clinical evidence and evolving surgical skill sets.
Indications and Outcomes
IPUM is primarily indicated for small to medium abdominal wall hernias with defect diameters of 5 cm or less. It is especially suitable for umbilical and incisional hernias, where minimally invasive access can reduce the patient’s overall burden from surgery.
When compared to traditional open hernia repair, randomized controlled trials and cohort study data suggest IPUM results in:
- Lower postoperative pain
- Faster hospital discharge
- Fewer wound-related complication events
- Smaller scars and better cosmetic result
Meta-analysis and retrospective cohort study reviews confirm that chronic pain, seroma, and infection are important considerations but occur at similar or lower rates compared to other repair types when best practices are followed.
Risks and Complications
Despite its advantages, IPUM carries several health risks, primarily related to the mesh’s location within the peritoneal cavity. Contact between the mesh and visceral organs increases the chance of adhesion, which can result in bowel obstruction or later complication. Other notable risks include:
Seroma Formation
A seroma may develop when a hernia defect is not closed, especially in traditional IPOM techniques. This fluid buildup can delay healing or mimic recurrence.
Chronic Pain and Mesh-related Issues
Mesh fixation with penetrating tacks or suture can lead to chronic pain, especially if nerves are involved. In rare cases, the mesh may erode into surrounding organs, causing injury or fistula formation.
Infection
Although uncommon in minimally invasive procedures, infection of the surgical mesh remains a serious concern, particularly in high-risk patients or contaminated fields.
Limitations and Evolution of Surgical Preferences
Though IPUM has been widely accepted, newer evidence and research have led many surgeons to explore alternatives that avoid placing mesh inside the peritoneal cavity. Techniques such as retromuscular, extraperitoneal, and totally extraperitoneal (TEP) repairs are gaining favor, especially in light of data suggesting reduced risk of adhesion and mesh erosion.
A growing body of literature, supports these evolving preferences. Several retrospective analyses and systematic review articles emphasize the long-term advantages of placing mesh away from intra-abdominal organs when technically feasible.
Special Considerations
Anatomical terms of location are crucial in operative planning for IPUM, particularly when considering mesh overlap, fascial plane separation, and proximity to critical structures like the bowel or bladder.
Additionally, some hernia cases may result from or coincide with birth defects, altered anatomy, or prior surgery, requiring individualized strategies for optimal result and maintenance of the abdominal wall integrity.
Evidence and Data Supporting IPUM
- A 2023 cohort study published in a peer-reviewed surgical journal reported comparable recurrence rates between IPUM and sublay repairs for hernias less than 5 cm.
- A recent clinical trial revealed significantly lower narcotic use postoperatively in patients undergoing laparoscopic IPUM compared to open mesh repair.
- One meta-analysis suggested that while IPUM shows favorable short-term outcomes, chronic pain and seroma formation remain prevalent challenges, particularly in large hernia repairs.
Dr. Iskandar’s Thoughts on the Technique
IPUM is not usually a preferred first choice, but remains and important tool in a surgeon’s armementarium . For most patients, an extraperitoneal mesh repair is preferred where the mesh is placed behind the peritoneum or between the muscle layers to exclude the mesh from the abdominal cavity therefore minimizing risks. However for many patients, this method may be the only option due to factors like previous surgery where the peritoneum or other fascial planes not adequate and do not lend themselves to this approach.
Conclusion
IPUM remains a widely used and effective hernia repair technique, especially for small-to-medium ventral and incisional hernias. Its strength lies in the minimally invasive approach, reduced hospital stays, and fast recovery. However, growing attention to mesh location and complication avoidance has driven a shift toward extraperitoneal techniques for many surgeons, especially in elective surgery cases.
As new data continues to emerge and research into optimal repair methods expands, understanding the methodology, index terms, and best-practice indications for IPUM is vital for both the practicing surgeon and the informed patient.
https://pmc.ncbi.nlm.nih.gov/articles/PMC11208757/
https://pmc.ncbi.nlm.nih.gov/articles/PMC9679982/
https://www.sciencedirect.com/science/article/pii/S2405857221001091
https://jamanetwork.com/journals/jamasurgery/fullarticle/2811758
source https://iskandarcenter.com/hernia-surgery/intraperitoneal-underlay-mesh-ipum-repair/
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