Hernia
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Here is a comprehensive overview of hernias:
Hernia — Comprehensive Overview
Definition
A hernia is the protrusion of an organ or tissue through a defect or weakness in the wall that normally contains it. Most hernias involve abdominal contents pushing through weaknesses in the abdominal wall or peritoneum.
Anatomical Classification & Types
Groin Hernias
| Type | Location | Key Features |
|---|---|---|
| Indirect inguinal | Lateral to inferior epigastric vessels, through the deep inguinal ring | Most common overall; follows the processus vaginalis; more common in males |
| Direct inguinal | Medial to inferior epigastric vessels, through Hesselbach's triangle | Acquired weakness; pushes directly through the abdominal wall |
| Femoral | Below inguinal ligament, medial to femoral vein in femoral canal | More common in women; high incarceration rate (~45%) due to small, rigid neck |
| Pantaloon | Combination of direct + indirect | Straddles the inferior epigastric vessels; difficult to reduce manually |
Differentiating direct vs. indirect inguinal hernia clinically: Place the thenar eminence on the ASIS — the index finger points to a direct hernia, the middle finger to an indirect hernia. - Thieme Atlas of Anatomy
Ventral / Abdominal Wall Hernias
| Type | Location | Notes |
|---|---|---|
| Umbilical | Through the fibromuscular umbilical ring | Congenital in infants (often resolves by age 5); acquired in adults with raised intra-abdominal pressure (obesity, ascites, pregnancy) |
| Epigastric | Midline through linea alba, above umbilicus | Usually preperitoneal fat only |
| Incisional | Through a prior surgical scar | Occurs in ~20% of laparotomy patients; recurrence rate 20–50% |
| Spigelian | Through the semilunar line, lateral to rectus muscle | Intramural — often missed on examination |
| Obturator | Through obturator foramen | Rare; "little old lady" hernia; presents with medial thigh pain (Howship–Romberg sign) |
Diaphragmatic / Internal Hernias
| Type | Notes |
|---|---|
| Hiatal (sliding / Type I) | Gastro-oesophageal junction migrates above diaphragm; strongly associated with GERD |
| Paraesophageal (Type II–IV) | Gastric fundus or other organs herniate beside the oesophagus |
| Paraduodenal | Most common congenital internal hernia |
| Post-surgical internal hernia | After Roux-en-Y bypass, colectomy, or Whipple — bowel herniates through mesenteric defects |
| Congenital diaphragmatic hernia (CDH) | Bowel in thorax; neonatal emergency |
Pathophysiology
All hernias result from a combination of increased intra-abdominal pressure and a structural weakness in the containing wall. Predisposing factors include:
- Age, male sex (for inguinal)
- Obesity, chronic cough, straining, heavy lifting
- Previous surgery (incisional hernias)
- Connective tissue disorders
Clinical Spectrum — Reducible → Incarcerated → Strangulated
| State | Definition | Management |
|---|---|---|
| Reducible | Contents can be returned spontaneously or manually | Elective repair |
| Incarcerated | Contents are trapped; cannot reduce | Urgent; manual reduction may be attempted if no strangulation |
| Strangulated | Ischaemia of trapped contents (bowel/omentum) | Surgical emergency |
Strangulation risk is inversely related to the size of the hernia neck. Femoral hernias strangulate in up to 40% of cases at first presentation; incisional hernias in only ~2%. Umbilical hernias account for ~15% of emergency hernia surgery, with up to 60% showing strangulation at operation. — Sleisenger & Fordtran's GI & Liver Disease
Richter hernia: Only part of the bowel wall is trapped, so complete obstruction may be absent even with strangulation — a diagnostic trap, most often with femoral or inguinal hernias.
Hiatal Hernia & GERD
Hiatal hernia is present in 54–94% of patients with reflux oesophagitis. It promotes reflux by:
- Displacing the LES above the diaphragm → reduces basal LES pressure
- Creating a persistent acid pocket in the hernia sac
- Increasing transient LES relaxation (tLESR) frequency
- Abolishing the pressure augmentation normally provided by crural diaphragm contraction
Large (≥3 cm), non-reducible hiatal hernias are particularly prone to severe GERD and are associated with Barrett's oesophagus and oesophageal adenocarcinoma. — Sleisenger & Fordtran's GI & Liver Disease
Diagnosis
- Physical examination: visible or palpable bulge, cough impulse, reducibility
- Ultrasound: useful for groin hernias, especially in obese patients
- CT scan: gold standard for internal hernias, incarcerated hernias, and complex cases; differentiates hernia type and assesses bowel viability
- Endoscopy / barium swallow: for hiatal hernia
Management
Watchful Waiting
Acceptable for asymptomatic inguinal hernias in older or unfit patients, as annual risk of acute incarceration is low (~0.2%/year).
Surgery
Surgery is the definitive treatment. Urgency is dictated by the clinical state:
Elective repair principles:
- Tissue repair (e.g., Shouldice, Bassini): primary suture repair of the defect; higher recurrence than mesh
- Mesh repair (e.g., Lichtenstein): tension-free; gold standard for most adult inguinal hernias; significantly lower recurrence rates
- Laparoscopic approaches:
- TAPP (Transabdominal Preperitoneal): mesh placed in preperitoneal space via peritoneal flap
- TEP (Totally Extraperitoneal): mesh placed without entering peritoneal cavity
Emergency repair (incarceration/strangulation):
- Quick resuscitation, IV antibiotics, urgent OR
- Assess bowel viability; resect if non-viable
- Mesh use is controversial in contaminated fields — open tissue repair is preferred initially; mesh repair reserved for subsequent elective repair if needed. — Mulholland & Greenfield's Surgery
Pediatric Considerations
High incidence of indirect inguinal hernia in infants (due to patent processus vaginalis) — treated with high ligation without mesh. Umbilical hernias in children usually resolve spontaneously by age 5; surgery if persistent, >2 cm, or complicated.
Key Associations to Remember
| Hernia | Classic Association |
|---|---|
| Femoral | Middle-aged woman, high strangulation risk |
| Richter | Partial bowel wall trap; no complete obstruction |
| Obturator | Elderly thin woman; Howship–Romberg sign |
| Spigelian | Interparietal / intramural; easy to miss |
| Pantaloon | Direct + indirect combined |
| Hiatal | GERD, Barrett's, adenocarcinoma |
| CDH | Neonatal respiratory distress (Bochdalek most common) |
Sources: Mulholland & Greenfield's Surgery 7e; Sleisenger & Fordtran's GI & Liver Disease; Roberts & Hedges' Clinical Procedures in Emergency Medicine; Bailey & Love's Short Practice of Surgery 28e; Thieme Atlas of Anatomy; Schwartz's Principles of Surgery 11e
Explain the surgical repair techniques (mesh vs. tissue) in detail
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Lichtenstein hernia mesh repair technique surgical steps
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The answer above covers all major repair techniques in depth. Here's a quick orientation to the structure:
Tissue repairs (4 techniques):
- Bassini — historic 3-layer; largely abandoned
- Shouldice — 4-layer running suture; best tissue repair; ~1% recurrence in expert hands; but 3.65× higher recurrence than mesh
- McVay — uses Cooper's ligament; uniquely repairs femoral defects; requires relaxing incision
- Desarda — autologous external oblique patch; good for mesh-free scenarios
Open mesh repairs (3 techniques):
- Lichtenstein — global gold standard; 0.2% recurrence; short learning curve; EHS-recommended
- Plug & Patch — 3D plug + flat mesh; equivalent outcomes to Lichtenstein but ~6% plug migration risk limits its use
- Rives-Stoppa — giant preperitoneal mesh; best for recurrent/bilateral/large defects
Minimally invasive repairs:
- TAPP — enters peritoneum; easier to learn; can inspect contralateral side
- TEP — stays extraperitoneal; lower visceral injury risk; steeper learning curve (~100 cases)
- eTEP / Robotic — emerging; expanding operative space; equivalent outcomes
The key clinical takeaway: mesh reduces recurrence by ~63% vs. tissue (OR 0.37). For open repair, Lichtenstein is preferred. For bilateral or recurrent hernias after prior anterior repair, laparoscopic TAPP/TEP is preferred. Tissue repair remains essential when mesh is contraindicated (contamination, strangulation).
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