The evolution of laparoscopic hernia surgery has introduced several approaches for repairing inguinal and groin hernias while minimizing abdominal-wall trauma. Among these developments, the Extended Totally Extraperitoneal (eTEP) technique has attracted significant interest because it modifies the conventional TEP approach to provide a more spacious extraperitoneal working environment. At the WALS 2025 Conference, eTEP for groin hernia repair was discussed as an important development in contemporary minimally invasive surgery.

The fundamental objective of eTEP remains the same as other modern minimally invasive preperitoneal repairs: to identify and reduce the hernia and reinforce the vulnerable groin region with appropriate mesh coverage. What changes is the route through which the surgeon reaches the preperitoneal anatomy. By using modified port placement and extending the extraperitoneal dissection, eTEP can provide a larger operative field than conventional TEP.

This concept is particularly important because the preperitoneal space can be technically demanding. In conventional TEP surgery, the surgeon must establish a working space within a relatively confined anatomical compartment. Instrument crowding, limited triangulation, and restricted visualization may make certain steps more challenging, especially during complex dissections. eTEP attempts to overcome some of these limitations by deliberately creating a larger working space.

The expanded field can improve the surgeon's ability to orient themselves anatomically. The inguinal region contains multiple structures that must be identified and preserved, including the inferior epigastric vessels, pubic landmarks, Cooper's ligament, cord structures, and the anatomical boundaries of the myopectineal orifice. Clear identification of these structures is essential for safe dissection and effective mesh deployment.

A key principle of eTEP is that the operation remains outside the peritoneal cavity. This distinguishes it from TAPP, in which the abdominal cavity is entered before the surgeon accesses the preperitoneal plane. Working extraperitoneally allows the surgeon to develop the necessary anatomical spaces without routinely exposing the mesh to the intra-abdominal viscera.

The technique begins with carefully planned access to the abdominal-wall layers. Port placement is modified compared with conventional TEP, and the surgeon creates an expanded extraperitoneal space. The working plane is then developed toward the groin, allowing visualization of the anatomy required for the repair. The precise access strategy can vary according to the patient's anatomy, the location of the hernia, and the surgeon's experience.

Once the preperitoneal space has been developed, hernia sac reduction becomes a major component of the procedure. Direct and indirect hernias require different anatomical considerations. An indirect hernia may involve dissection around the spermatic cord structures, while a direct hernia requires attention to the posterior wall of the inguinal canal. A systematic anatomical approach helps the surgeon manage these differences.

The expanded working space can be especially useful when dealing with large or bilateral hernias. More room for instrument movement may make dissection and mesh handling easier, while a broad view can help the surgeon assess both sides of the groin. WLH's WALS 2025 educational material also identifies complex and recurrent hernias among situations in which eTEP may be considered.

Another important application is selected recurrent hernia repair, particularly when previous operations have altered the anatomy. Reoperative surgery often requires careful consideration of scar tissue and the previously used anatomical plane. An extraperitoneal approach may provide an alternative route in selected cases, but the complexity of recurrent hernia surgery means that individualized planning and advanced experience are essential.

After the hernia has been reduced and the relevant preperitoneal spaces have been adequately dissected, the surgeon proceeds to mesh placement. The mesh should be positioned to provide broad coverage of the myopectineal orifice rather than simply covering the visible hernia defect. The expanded eTEP workspace can facilitate deployment of a large mesh and allow the surgeon to inspect its position before completing the procedure.

The concept of adequate mesh overlap is particularly important. A well-prepared preperitoneal space provides the surgeon with the room necessary to position the prosthesis appropriately. The objective is to maintain broad coverage while respecting important anatomical structures and avoiding unnecessary fixation or tissue trauma according to the chosen technique.

Another area emphasized in discussions of eTEP is surgical ergonomics. The wider working space can provide more favorable angles for instruments and reduce the restrictive nature of conventional TEP dissection. Improved ergonomics can be relevant during longer or technically demanding procedures and may make the technique more comfortable for experienced laparoscopic surgeons.

However, the technical advantages of eTEP must be balanced against its learning curve. Surgeons transitioning from conventional TEP or TAPP must develop familiarity with the modified access strategy, expanded anatomical planes, port positioning, and extraperitoneal dissection. The ability to recognize and manage peritoneal breaches, bleeding, difficult hernia sacs, and altered anatomy is also important.

Training is therefore a major part of adopting eTEP safely. Simulation, cadaveric anatomy, supervised surgical training, video review, and progressive experience can help surgeons develop the spatial understanding necessary for advanced extraperitoneal procedures. WALS educational discussions have emphasized that technical innovation should be accompanied by appropriate surgical education and experience.

From the patient's perspective, the broader objective of minimally invasive groin hernia repair is to achieve effective hernia treatment while limiting surgical trauma. The WALS 2025 material discusses potential benefits including reduced postoperative pain, shorter hospitalization, and faster recovery, although outcomes depend on patient factors, surgical technique, surgeon experience, and the complexity of the hernia.

It is also important to understand that eTEP is one technique within a larger range of groin hernia procedures. Open anterior repairs, conventional TEP, TAPP, robotic approaches, and other techniques may all have appropriate roles. The selection of an approach should be based on the individual clinical situation rather than assuming that one technique is suitable for every patient.

The significance of eTEP lies in its approach to the surgical workspace itself. Instead of accepting the limited working environment of conventional extraperitoneal laparoscopy, the technique deliberately expands the space to improve visualization and instrument movement. This represents a broader trend in minimally invasive surgery: modifying access and anatomical exposure to make complex procedures more controlled and reproducible.

For surgeons attending WALS 2025, the discussion of eTEP provides an opportunity to examine modern concepts in groin hernia surgery, including extraperitoneal anatomy, port placement, hernia-sac management, mesh positioning, ergonomics, and management of challenging cases. For residents and fellows, it also demonstrates why understanding surgical anatomy is fundamental before adopting advanced minimally invasive techniques.

The future development of eTEP will depend on continued surgical experience, training, clinical research, and evaluation of long-term outcomes. As more surgeons become familiar with the technique, ongoing study will help clarify which patient groups and hernia characteristics may derive the greatest practical benefit from this approach.

In summary, eTEP represents an expanded and technically refined approach to totally extraperitoneal groin hernia repair. By creating a larger extraperitoneal workspace, it can provide enhanced visualization, improved instrument maneuverability, and greater access to the anatomy of the inguinal region. The WALS 2025 discussion highlights how this evolution of TEP is contributing to the continuing development of minimally invasive hernia surgery while reinforcing the importance of anatomy, training, patient selection, and meticulous surgical technique.