Hernia
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Here is a comprehensive overview of hernia complications, covering both complications of the hernia itself and those arising after repair.
Complications of Hernia
A. Complications of the Hernia Itself
1. Incarceration
A hernia is incarcerated when its contents cannot be reduced back into the abdominal cavity. Incarceration alone does not imply a surgical emergency — a wide-necked hernia may contain nonreducible bowel loops with no compromise of blood supply or luminal diameter. However, it is the precursor to strangulation.
- Bowel or omentum are the usual incarcerated contents.
- Manual reduction (taxis) should be attempted for incarcerated hernias without signs of strangulation.
- Successful reduction must be followed by expeditious surgical repair.
- Contraindications to taxis: severe tenderness, skin erythema, or other signs of strangulation — these warrant urgent surgical consultation.
Sleisenger & Fordtran's Gastrointestinal and Liver Disease
2. Strangulation
Strangulation occurs when compression at the neck of the hernia restricts blood flow to herniated contents, causing ischemia. It is the most feared complication.
Pathophysiology:
- Obstruction of venous outflow → increased intravascular pressure → extravasation of fluid → free fluid in the hernia sac (a sensitive ultrasound finding).
- Progressive ischemia → infarction → perforation → peritonitis.
Risk by hernia type:
| Hernia Type | Strangulation Risk |
|---|---|
| Femoral | Up to 40% at initial presentation |
| Umbilical | Up to 60% show strangulation at surgery |
| Incisional | Only ~2% |
- Among patients undergoing surgery for SBO due to hernia: intestinal ischemia in up to 75%, intestinal necrosis in >25%.
- Smaller hernias carry greater risk (tighter neck).
Sleisenger & Fordtran's Gastrointestinal and Liver Disease; THIEME Atlas of Anatomy
3. Bowel Obstruction
- Incarceration of bowel causes small bowel obstruction (SBO).
- Hernias account for a significant proportion of emergency SBO surgery; incarcerated hernia was associated with 44.5% of operations performed for acute SBO in one large dataset.
- A special variant — Richter's hernia — involves only a portion of the bowel wall being incarcerated, so obstruction and strangulation may occur without complete luminal obstruction, making it especially dangerous.
Mulholland and Greenfield's Surgery, 7e
4. Richter's Hernia
Only a partial thickness of the bowel circumference is trapped. Bowel continuity is maintained so obstruction is not complete, yet strangulation and perforation can occur silently. Most frequent at the femoral ring.
B. Complications of Hernia Repair (Post-Operative)
Complications of Groin / Inguinal Hernia Repair
Recurrence
- The most commonly cited outcome measure.
- Tissue repairs (Shouldice): ~1% in expert hands, up to 9% for inexperienced surgeons.
- Lichtenstein mesh repair: recurrence rate as low as 0.2% in large series.
- Endoscopic (TEP/TAPP): equivalent recurrence to open mesh; requires >30–250 cases to develop proficiency.
Chronic Post-Operative Pain (Inguinodynia)
Reported in up to 63% of inguinal hernia repairs (though moderate-to-severe, functionally limiting pain affects 6–8%).
Three mechanisms:
| Type | Cause | Features |
|---|---|---|
| Nociceptive (somatic) | Muscular/ligamentous trauma | Reproduced by muscle contraction; resolves with NSAIDs & rest |
| Neuropathic | Nerve damage or entrapment | Burning, sharp, tearing; dermatomal distribution |
| Visceral | Sympathetic plexus injury | Poorly localized; may present as dysejaculation |
Nerves at risk:
- Anterior repairs: ilioinguinal, iliohypogastric
- Endoscopic repairs: genitofemoral, lateral femoral cutaneous
Specific syndromes:
- Meralgia paresthetica: injury to lateral femoral cutaneous nerve → persistent paresthesia of the lateral thigh.
- Osteitis pubis: inflammation of pubic symphysis → medial groin/symphyseal pain worsened by thigh adduction.
- Postherniorrhaphy inguinodynia: refractory cases require triple neurectomy ± mesh removal (meshoma).
Cord & Testicular Complications
- Ischemic orchitis: vascular compromise of the testis post-repair; presents as painful swollen testis within days.
- Testicular atrophy: long-term sequel of ischemic orchitis.
- Hydrocele: fluid accumulation around the testis.
- Dysejaculation / Division of vas deferens.
- Testicular descent (disruption of fixation).
Wound Complications
- Wound infection, seroma, hematoma (wound, scrotal, or retroperitoneal).
Prosthetic (Mesh) Complications
- Mesh contraction (shrinkage over time).
- Mesh erosion into adjacent structures.
- Mesh infection / rejection.
- Intra-abdominal plug migration: occurs in ~6% of plug-and-patch repairs.
Complications of Ventral Hernia Repair (VHR)
General Surgical Complications
- Postoperative ileus, early SBO, cardiac arrhythmias (especially with pneumoperitoneum), urinary retention, pulmonary complications.
- Abdominal compartment syndrome: with large defects requiring forced visceral reduction and fascial closure under tension — elevated intra-abdominal pressure can cause respiratory failure and prevent extubation.
- Venous thromboembolism (VTE): all VHR patients are considered high risk.
Surgical Site Infection (SSI)
Classified by the CDC into three depths:
| SSI Type | Depth | Features |
|---|---|---|
| Superficial | Skin & subcutaneous tissue | Purulent drainage, erythema, tenderness |
| Deep | Fascia or muscle layers | Fever, wound dehiscence, abscess |
| Organ-space | Intra-abdominal compartment | Purulent drain output, intra-abdominal sepsis |
Risk stratified by validated scoring tools: VHRS, HWRAT, CeDAR, VHWG, AHSQC ORACLE.
Laparoscopy-Specific Complications
- Vascular injury (intra-abdominal, retroperitoneal, abdominal wall).
- Visceral injury: bowel perforation, bladder perforation.
- Trocar site complications: hematoma, wound infection, trocar site hernia.
- Gas embolism, hypercapnia, diaphragmatic dysfunction.
Summary Table
| Complication | Category | Key Point |
|---|---|---|
| Incarceration | Hernia itself | Non-reducible; try taxis if no strangulation signs |
| Strangulation | Hernia itself | Ischemia; up to 40% of femoral hernias at presentation |
| Bowel obstruction | Hernia itself | Hernia → 44.5% of emergency SBO surgery |
| Richter's hernia | Hernia itself | Partial wall strangulation without complete obstruction |
| Recurrence | Post-repair | Mesh repair < tissue repair |
| Chronic pain | Post-repair | Up to 63%; nociceptive, neuropathic, visceral types |
| Ischemic orchitis / atrophy | Post-repair (inguinal) | Vascular compromise of testis |
| Mesh complications | Post-repair | Infection, erosion, contraction, migration |
| SSI | Post-repair (VHR) | 3 depths; risk-stratified by HWRAT/VHRS |
| Abdominal compartment syndrome | Post-repair (VHR) | Large defect + forced closure |
Sources: Schwartz's Principles of Surgery 11e; Mulholland and Greenfield's Surgery 7e; Sleisenger & Fordtran's GI and Liver Disease; Tintinalli's Emergency Medicine.
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