Hernia Repair: ABSITE 2026 Review with Behind the Knife

Core Principles of Hernia Repair

• 🎯 A tension-free repair is the primary goal for any hernia surgery.
• ⚠️ The most common cause of hernia recurrence is wound infection.
• 🌎 Worldwide, hernias are the number one cause of small bowel obstructions, while in the US, they are the second most common cause after adhesions.

Abdominal Wall Anatomy and Layers

• 🧱 Understanding the layers of the abdominal wall (skin, subcutaneous fat, Scarpa's fascia, anterior rectus sheath, rectus muscle, posterior rectus sheath, preperitoneal fat, peritoneum) is crucial for repair techniques.
• ↔️ Lateral to the rectus sheath, the layers include external oblique, internal oblique, transversus abdominis, and transversalis fascia.
• 📍 The arcuate line, approximately one-third of the distance between the umbilicus and pubic symphysis, marks where the posterior rectus sheath ends, influencing repair strategies like TAP and posterior component separations.

Key Anatomical Landmarks and Embryology

• 🔺 Hasselbach's triangle, bordered by the rectus abdominis, inguinal ligament, and epigastric vessels, is the site of direct inguinal hernias.
• 🌐 Embryologic remnants at the umbilicus include the vitelline duct (omphalomesenteric duct), urachus, obliterated umbilical arteries, and the obliterated umbilical vein (ligamentum teres).
• 👶 Midgut herniation occurs at 6 weeks of development and returns at 10 weeks; failure of this process can lead to gastroschisis or omphalocele.

Mesh Types and Selection Criteria

• 🪡 Mesh selection depends on anatomical location, repair type, hernia size, and patient factors, with no single "one-size-fits-all" solution.
• ⚖️ Major categories include synthetic (non-absorbable, partially absorbable, synthetic with barrier) and biologic meshes.
• 🦠 For contaminated fields or strangulated bowel, biologic mesh is generally the safest choice, although newer synthetic meshes are being considered with caveats.

Specific Hernia Types and Management

• 👶 Pediatric umbilical hernias often close spontaneously; repair is typically considered after age 5 if persistent.
• 🩺 In cirrhotic patients with umbilical hernias and ascites, controlling ascites is paramount, often requiring TIPS or medical management before and after repair.
• 💡 Indirect inguinal hernias are typically congenital (patent processus vaginalis), while direct inguinal hernias are acquired due to weakness in the floor of the inguinal canal.

Minimally Invasive and Open Repair Techniques

• 🤖 Minimally invasive approaches (TEP and TAPP) for inguinal hernias offer advantages in covering indirect, direct, and femoral spaces.
• 🩹 Component separations (anterior, posterior, and transversus abdominis release/TAR) are used for large ventral and incisional hernias to allow for mesh placement and closure.
• 🩹 TAR is often preferred for its effectiveness in creating space with fewer wound complications compared to anterior component separation.

Rare Hernias and Special Considerations

• 👻 Obturator hernias are rare, typically presenting in thin elderly patients with bowel obstruction, and can be diagnosed with CT scans or the characteristic (though unreliable) Hüsing-Romberg sign.
• 🚶 Diastasis recti is a widening of the linea alba, not a true hernia, and is primarily managed with physical therapy, though it can increase recurrence risk if combined with a ventral hernia repair.
• ⚠️ Spigelian hernias occur at the junction of the semilunaris and arcuate line, can be difficult to diagnose on physical exam, and have a high risk of incarceration.

Complications and Clinical Scenarios

• 🩸 Corona mortis, a vascular anomaly, can cause significant bleeding during laparoscopic inguinal hernia repair when tacking mesh to Cooper's ligament.
• 💧 Mesh explantation is often necessary in cases of severe wound infection with purulence around the mesh.
• 🤰 For young females desiring future pregnancies with minimally symptomatic umbilical hernias, deferring repair until after childbearing is often recommended.