Define Principles of Hernia & Its Repair. Describe its aetiology, classification, treatment and complications.

Definition & Parts

A hernia is the abnormal protrusion of a viscus, or part of a viscus, through a weakness or defect in the wall of its containing cavity into an abnormal position. Every hernia has three components: the sac (a pouch of peritoneum, with a mouth, neck, body and fundus), the coverings (the layers of the wall it pushes in front of it), and the contents — most often omentum (an 'omentocele') or bowel (an 'enterocele').

Aetiology — Two Ingredients

Hernias form from the combination of raised intra-abdominal pressure and a weak abdominal wall. Pressure is raised by chronic cough (COPD), chronic straining (constipation or prostatism), ascites, pregnancy, heavy lifting and obesity; the wall is weakened by congenital defects, ageing, previous incisions and collagen disorders. Recognising these factors matters because treating them is part of preventing recurrence.

Classification

Hernias are classified by site (inguinal, femoral, umbilical, incisional, epigastric and rarer types), by their contents, by whether they are reducible or irreducible, and as external (through the abdominal wall) or internal (through a defect within the abdominal cavity). This framework organises an otherwise long list.

Principles of Treatment

• Conservative — a truss is rarely used, only for a patient unfit for surgery, and does not cure the hernia.
• Herniotomy — excision and ligation of the sac at its neck; sufficient in children, whose wall is otherwise sound.
• Herniorrhaphy — herniotomy plus repair/reconstruction of the weakened wall.
• Hernioplasty — reinforcement of the wall with a prosthetic mesh, giving a 'tension-free' repair (Lichtenstein) with the lowest recurrence; increasingly done laparoscopically (TEP/TAPP).

The Role of Mesh & Treating the Cause

Tension-free mesh repair has become standard for adult hernias because suturing tissue under tension is painful and has a higher recurrence rate, whereas mesh bridges and reinforces the defect. Equally important is correcting precipitating factors — treating a chronic cough, relieving constipation or prostatic obstruction, and encouraging weight loss and smoking cessation — otherwise the same forces that produced the hernia will cause it to recur.

Complications of Hernia Surgery

• Hernia repair, though common and safe, has recognised complications that must be included for consent.
• Early complications include haematoma, seroma, wound infection, and urinary retention.
• Specific to groin surgery are injury to the ilioinguinal or genitofemoral nerve (causing chronic groin pain or numbness), ischaemic orchitis or testicular atrophy (from damage to the cord vessels), and damage to the vas.
• Late complications are chronic pain, mesh infection, and recurrence. Awareness of these guides careful technique and honest pre-operative discussion.

Laparoscopic VS Open Repair

The choice between open (Lichtenstein) and laparoscopic (TEP/TAPP) repair is a practical decision. Laparoscopic repair offers less post-operative pain and a quicker return to work and is particularly favoured for bilateral or recurrent hernias, but it needs general anaesthesia and greater expertise. Open mesh repair can be done under local anaesthesia and is well suited to the frail patient or a large scrotal hernia. Both are tension-free mesh techniques with low recurrence rates, so the decision is individualised to the hernia and the patient.

Factors Affecting Recurrence

Recurrence is the yardstick of a hernia repair, and understanding what drives it ties the topic together. Recurrence is increased by tension in the repair (hence the move to tension-free mesh), infection, poor tissue quality, and — crucially — uncorrected precipitating factors such as a persistent cough, constipation, prostatism or obesity. This is why the modern repair combines a tension-free mesh with treatment of the underlying cause, and why patient optimisation (smoking cessation, weight loss, treating a chronic cough) is considered part of the operation rather than an afterthought.

• Hernia = abnormal protrusion of a viscus through a defect in its containing wall; parts = sac (mouth/neck/body/fundus), coverings, contents.
• Aetiology = raised intra-abdominal pressure + weak wall (treat the cause to prevent recurrence).
• Operations: herniotomy (child), herniorrhaphy, hernioplasty (tension-free mesh, Lichtenstein; laparoscopic TEP/TAPP).

Tension-free mesh repair has the lowest recurrence rate.

• Hernia = abnormal protrusion of a viscus through a defect in its containing cavity's wall; parts = sac, coverings, contents (omentocele/enterocele).
• Aetiology = raised intra-abdominal pressure (cough, straining, ascites, pregnancy, obesity) + weak wall (congenital, ageing, incisions).
• Classify by site, contents, reducible vs irreducible, external vs internal.
• Treatment: truss (rarely, if unfit); herniotomy (child); herniorrhaphy; hernioplasty (tension-free mesh — Lichtenstein/laparoscopic TEP/TAPP).
• Reduce contents, excise/ligate sac, repair & reinforce with mesh, and treat precipitating factors to prevent recurrence.