Umbilical and Epigastric Hernia

Meet the patient

A 4-month-old is brought in with a soft bulge at the belly button that pops out when she cries and vanishes when she sleeps. The mother is anxious; the defect is a fingertip across and the skin over it is healthy. You reassure, measure the ring, and book one review at age 4 — almost certainly this will close on its own.[3]

Across the ward, a 56-year-old man with alcoholic cirrhosis and tense ascites has a hard, tender, irreducible lump at his umbilicus, and the skin over it is dusky. He has no vomiting, no distension, and his bowels are open. This is not a calm outpatient problem — it is a Richter's hernia strangulating without obstructing, and the clock is measured in hours.[1]

Two questions decide every umbilical hernia you meet: will this close on its own? (a question of age and ring size) and is bowel at risk right now? (a question of tenderness, irreducibility, and a rigid neck). Hold those two and the whole topic arranges itself.[1]

Two faces of the linea alba — umbilical versus epigastric

These are two hernias through one structure: the midline linea alba. The umbilical hernia punches through the umbilical ring itself, at the cicatrix; the epigastric hernia punches through the linea alba anywhere between the umbilicus and the xiphisternum. Same wall, different address — and a different sac, which is where the viva marks live.[1]

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The four numbers that own the topic — say them in one breath in the viva:[1]

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This pair matters to the examiner for two reasons. They are rich in applied anatomy and embryology — prime viva and written material. And they span a spectrum of severity from a benign, self-resolving cosmetic bulge in a baby to a life-threatening strangulated Richter's hernia in a cirrhotic. A single topic must therefore carry paediatric observation, elective adult mesh repair, complex abdominal wall reconstruction, and emergency laparotomy for ischaemic bowel.[1]

The layered wall — and the arcuate line's weak point

Every ventral hernia is understood, repaired, and examined through the layered anatomy of the anterior abdominal wall. Bound it superiorly by the xiphoid and costal margins, inferiorly by the inguinal ligaments and pubic symphysis, and laterally by the mid-axillary lines. The midline furrow is the linea alba; the lateral edge of each rectus belly is the linea semilunaris, running from the pubic tubercle to the ninth costal cartilage. The umbilicus sits at the L3 to L4 disc in the adult, punching through the linea alba at its widest point.[1]

The nine layers, superficial to deep — cluster them and they stay:[1]

1. Skin — loosely attached everywhere except at the umbilicus, where it is tethered to deep fascia with no subcutaneous fat. That tethering is the dimple, and it is why the skin over a tense umbilical hernia thins and ulcerates.
2. Superficial fascia — two leaves: fatty Camper's and membranous Scarpa's (continuous with dartos, Colles', and the superficial perineal fascia; the plane surgeons identify when closing).
3. Deep investing fascia — a thin sheet over the muscles.
4. External oblique — the most superficial flat muscle; its aponeurosis feeds the anterior rectus sheath throughout and forms the inguinal ligament inferiorly.
5. Internal oblique — fibres run up and medially, opposite to external oblique; its aponeurosis splits around the rectus above the arcuate line and passes wholly in front below it.
6. Transversus abdominis — transverse fibres; aponeurosis passes behind the rectus above the arcuate line and in front below it.
7. Transversalis fascia — the endo-abdominal fascia; the preperitoneal space between it and the peritoneum is the plane exploited by sublay (Rives-Stoppa) mesh and TEP inguinal repair.
8. Extraperitoneal fat — variable, often copious in the obese.
9. Parietal peritoneum — the innermost layer; when a true sac is present, this is the layer stretched out over the contents.[1]

The rectus sheath and the arcuate line

The arcuate line (of Douglas) is the posterior-sheath weak point examiners love. It sits roughly midway between the umbilicus and the pubis, and the architecture of the rectus sheath flips across it. The sheath encloses the rectus abdominis — a vertical strap with three to four tendinous intersections that tether the anterior sheath and confine a rectus sheath haematoma vertically — and the small pyramidalis, with the superior and inferior epigastric vessels running within.[1]

• Above the arcuate line — the anterior wall is external oblique aponeurosis plus the anterior leaf of internal oblique; the posterior wall is the posterior leaf of internal oblique plus transversus abdominis aponeurosis.
• Below the arcuate line — all three aponeuroses pass anterior to the rectus, so the posterior wall is transversalis fascia and peritoneum alone. The inferior epigastric vessels enter the sheath by crossing this line.[1]

The linea alba — widest at the umbilicus, avascular, perforated

The linea alba is simultaneously the strongest and the most hernia-prone part of the wall. It is the midline tendinous raphe woven from the interlacing aponeuroses of the three flat muscles, running from xiphoid to pubic symphysis. It herniates because it is avascular (so repairs heal slowly and dehisce) and perforated by small neurovascular foramina through which preperitoneal fat can protrude — that is the seed of the epigastric hernia. It is widest at the umbilicus and narrowest below, which is why diastasis recti appears above the umbilicus and why lower midline incisions are mechanically stronger.[1]

Innervation and blood supply — and why chronic pain happens

The T10 dermatome rings the umbilicus — a viva staple. The wall is supplied segmentally by T7 to T12 plus the iliohypogastric and ilioinguinal nerves (L1); T7 maps to the epigastrium and xiphoid. The nerves run between internal oblique and transversus abdominis, then pierce the posterior rectus sheath to enter the rectus. Iatrogenic injury to the iliohypogastric and ilioinguinal nerves during open mesh placement — lateral dissection or deep transfascial sutures — is a leading cause of chronic post-herniorrhaphy pain.[1]

The blood supply is richly anastomotic. The superior and inferior epigastric vessels run within the rectus sheath and meet around the umbilicus — and in cirrhosis this becomes a portosystemic anastomosis through the recanalised paraumbilical veins, the Crueveilhier-Baumgarten sign or syndrome, producing the caput medusae. Segmental intercostal and lumbar arteries run with the nerves; the deep circumflex iliac and superficial external pudendal complete the inferior supply. The rich anastomosis is what permits wide flap elevation (as in component separation) without devascularising the wall.[1]

Four structures at birth — the embryology core

"What passes through the umbilical ring at birth?" is the most reliable embryology viva opener there is. Name all four and you have the marks:[1]

How the ring closes — two forces, one deadline

Closure is driven by fibroblast contraction of the ring and medial growth of the rectus abdominis. The physiological midgut herniation of weeks 6 to 10 returns to the abdomen after birth, and the ring contracts. Most closures happen in the first three years; by age 5, 95 percent of infantile umbilical hernias have closed. The size of the ring at birth sets the odds: defects under 0.5 cm almost always close, those over 1.5 cm rarely do — the basis of the surgical threshold.[1]

The cover test — bedside closure prediction

The cover test is the classic clinic tool for forecasting closure. With the child supine and relaxed, the examiner's thumb fully occludes the fascial defect while the child strains or cries. If the skin bulges only slightly and the ring is small (under 1 cm), the hernia is likely to close. If the skin balloons extensively around the thumb — a large defect over 1.5 cm — spontaneous closure is unlikely and elective repair is planned. This is a favourite viva question.[1]

The congenital umbilical differential — membrane or no membrane

Every umbilical lesion at birth reduces to one question: is there a covering membrane? That single discriminator separates omphalocoele from gastroschisis, and it is non-negotiable exam material.[1]

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How common, who, and why the ring gives way

Infantile umbilical hernia is one of the commonest benign findings of infancy; the adult version is a disease of pressure. The epidemiology splits cleanly by age.[1]

• Infantile — present in 10 to 20 percent of all infants; up to 75 percent in premature infants under 1500 g, and around 40 percent in infants of African descent. Equal sex incidence; Down syndrome carries a markedly higher prevalence.
• Adult umbilical or paraumbilical — female-to-male roughly 3 to 1; bound to obesity (BMI over 30), multiparity, ascites, chronic cough, chronic constipation, and heavy lifting.
• Epigastric — the opposite sex skew, commoner in men roughly 3 to 1, typically aged 20 to 50; multiple in 20 percent of patients.
• Spigelian — rare (under 2 percent of ventral hernias), usually over age 50; the commonest occult interparietal hernia.
• Incisional — 10 to 20 percent of midline laparotomies, rising to 35 percent in high-risk groups (obesity, smoking, wound infection, immunosuppression); the largest single contributor to complex abdominal wall reconstruction.[1]

Why midline defects develop — weak fascia meets raised pressure

A ventral hernia is the product of two forces: intrinsic fascial weakness and chronically raised intra-abdominal pressure. Neither alone is enough; together they widen a defect until peritoneal contents follow.[1]

Intrinsic weakness — the linea alba and umbilical ring are collagen-rich and avascular. With ageing, multiparity, obesity, and corticosteroid use, the collagen I to collagen III ratio falls and the fascia weakens; smoking, malnutrition, and connective tissue disorders (Marfan, Ehlers-Danlos) accelerate this. The multiperforate linea alba offers ready-made holes through which preperitoneal fat protrudes — the seed of every epigastric hernia.[1]

Raised intra-abdominal pressure is the major extrinsic driver, and its causes cluster into one mnemonic at the foot of this topic. The commonest single factor in adults is obesity (mechanical pressure plus collagen weakening); the rest are pregnancy, chronic cough (COPD, TB), chronic constipation with straining, ascites (cirrhosis, heart failure, ovarian cancer), and peritoneal dialysis.[1]

Once a defect opens, peritoneal contents — omentum, small bowel, sometimes colon — enter the sac, peristalsis and straining slowly widen the neck, and the hernia enlarges irreversibly. Adult umbilical hernias never close spontaneously: collagen remodelling is complete, and there is no growth-driven ring contraction to rescue them, as there is in the infant.[1]

The viability cascade — incarceration to strangulation in 4 to 8 hours

This is the section that decides whether your patient leaves hospital. Know the cascade by heart, because a strangulated hernia is a surgical emergency and the window is narrow.[1]

The mechanism in a small rigid neck is mechanical, and it is fast. The firm fibrous edge of the ring compresses the venous return of the protruding viscus at the neck of the sac. Venous congestion produces oedema and swelling, which tightens the constriction, occludes the arterial supply, and drives transmural ischaemia. The bowel turns dusky, then purple, then black; serosanguineous (later purulent or faeculent) fluid collects in the sac; bacterial translocation brings peritonitis and sepsis. In a small rigid-neck defect the whole cascade can take only 4 to 8 hours.[1]

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Richter's hernia — strangulation without obstruction

Richter's hernia is the prototypical small-defect, high-risk hernia, and the one most often missed. Only the anti-mesenteric border of the bowel enters the sac, typically through a small (1 to 2 cm), rigid, fibrous ring. Because only part of the circumference is trapped, the lumen stays patent and intestinal contents still pass. The classic four signs of mechanical obstruction — colicky pain, distension, vomiting, obstipation — are all absent.[1]

The patient therefore presents with a localised, tender, irreducible mass that may progress silently to systemic sepsis and peritonitis from perforation of the strangulated wall segment. This is the hernia missed until perforation — the diagnosis hinges on examining every hernial orifice in any patient with unexplained peritonitis or sepsis, especially elderly women (femoral) and cirrhotic or obese patients (umbilical).[1]

The named variants — Littre, Maydl, and the sliding hernia

Four named hernia contents recur in vivas; each carries a trap. Know what is in the sac and what you must do at the table.[1]

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At surgery, judge the trapped segment for viability: pink and peristalsing — reduce and repair; dusky but recovering after warm packs — viable; non-viable — resect with primary anastomosis if clean, or a stoma if contaminated. Always inspect the bowel proximally and distally, and remember the Maydl W-loop before you close.[1]

At the bedside — history, exam, and the mimics

Most umbilical and epigastric hernias are clinical diagnoses; the history and the finger do the work. The bulge is the headline — worse standing, straining, coughing, lifting, or at the end of the day, and it may reduce spontaneously on lying flat or with gentle pressure. The pain is often a dull dragging ache rather than sharp pain, and an epigastric fat hernia may be exquisitely tender despite a defect you can barely feel.[1]

The history turns dangerous when complications arrive: severe localised pain with nausea, vomiting, distension, and constipation means obstruction or strangulation. And a cirrhotic with clear fluid leaking from the umbilicus has a ruptured umbilical hernia — a surgical emergency, not a curiosity. Chase the drivers in the past history: chronic cough, constipation, prostatism, ascites, prior surgery, smoking, steroids, connective tissue disease, and the obstetric history in women.[1]

Examination runs in five steps — and the trap is measuring the bulge instead of the defect:[1]

1. Inspection (patient standing) — bulge, skin changes (thin, red, dusky, ulcerated), scars, striae, stomas.
2. Cough impulse — a finger over the defect; an expansile cough impulse confirms a hernia.
3. Palpation — measure the fascial defect, not the bulge (skin stretches; the defect is the true size), and assess reducibility, consistency, and tenderness. A tense, tender, irreducible mass with overlying erythema is strangulated until proven otherwise.
4. Auscultation — bowel sounds over the swelling confirm bowel content.
5. General examination — signs of cirrhosis (ascites, spider naevi, palmar erythema, jaundice, caput medusae), COPD (barrel chest, pursed-lip breathing), obesity, pregnancy, and any obstruction or peritonitis.[1]

The mimics — and the two that are not hernias

Two mimics are not hernias at all, and operating on them is the classic error. Diastasis recti is a widened linea alba with no true fascial defect and no cough impulse at a ring — it disappears when the patient lifts their head off the bed, and it is not treated surgically. A Sister Mary Joseph nodule is a hard, fixed, metastatic deposit at the umbilicus (gastric, ovarian, colorectal, or pancreatic primary) in an older patient — a red flag, not a hernia.[1]

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Imaging — when the finger is not enough

Most elective umbilical and epigastric hernias need no imaging at all — they are clinical diagnoses. Reach for a scan only when the eye and finger are insufficient.[1]

• Ultrasound — first-line when in doubt; maps the fascial defect, contents, and any diastasis, and is invaluable in the obese (where examination is hard) and for the Spigelian hernia (interparietal and occult — a Spigelian hernia lying between internal and external oblique can be invisible clinically, so ultrasound or CT is essential).
• CT abdomen — for complex, recurrent, or incisional hernias, for loss of domain planning, to characterise contents and find occult defects, and in the cirrhotic to map ascites and varices before surgery.
• MRI — occasionally, for chronic abdominal wall pain of uncertain cause (nerve entrapment, a small occult hernia).
• Pre-operative bloods and anaesthetic assessment — FBC, U and E, LFTs, coagulation, group and save; optimise comorbidities first (smoking cessation 4 weeks pre-op, weight loss, diabetic control to HbA1c under 69 mmol per mol, or 8.5 percent).
• Cirrhotic workup — Child-Pugh and MELD scores, ascitic fluid analysis (cell count and culture to exclude spontaneous bacterial peritonitis), variceal screening, coagulation, and platelets.[1]

The management fork — watch the child, mesh the adult

One decision dominates the whole topic: is this a closing ring or a permanent defect? The answer splits management down the middle.[1]

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The defect-size table is the single most examinable management grid:[1]

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The child — watch and wait until 4 to 5

The paediatric umbilical hernia is a waiting game, and waiting is usually the right answer. Present in 10 to 20 percent of all infants (up to 75 percent if premature, around 40 percent in African descent), it closes spontaneously in 95 percent by age 5. Rings under 1 cm close fastest; those over 1.5 cm rarely close.[3]

Observe until age 4 to 5. Surgery is reserved for persistence after age 4 to 5, a defect over 1.5 cm, incarceration (rare, under 1 percent), or progressive enlargement. Run the cover test at each clinic visit to stratify the likelihood of closure.[3]

When you do operate, the technique is cosmetic and quick:[3]

1. A small curved transverse infra-umbilical incision in the skin crease, hidden in the umbilical fold.
2. Dissect to the sac; separate it from the overlying skin and free it to the fascial level.
3. Ligate the sac at the fascial defect and remove the excess — or, if there is no true sac, simply reduce the preperitoneal fat.
4. Close the fascial defect transversely with interrupted absorbable sutures (2-0 or 0 polydioxanone, PDS).
5. Never use mesh in a child — strong fascia, small defects, foreign-body risk, and a growing abdomen.
6. Close skin with a subcuticular absorbable suture and reconstruct the umbilical dimple by suturing umbilical skin to fascia.
7. Day-case surgery; same-day discharge.[3]

Outcomes are excellent — recurrence under 1 percent, minimal complications. Rates climb in children with connective tissue disorders, mucopolysaccharidoses, and chronic ascites or VP shunts.[3]

The adult — mesh, never suture

Adult umbilical and epigastric hernias never close spontaneously; symptomatic means surgery. Repair is indicated for pain, enlargement, or cosmetic concern. Only the moribund or extremely high-risk patient with a small, reducible, asymptomatic hernia is watched — and even then the natural history is enlargement and rising complication risk.[1]

Mesh has replaced suture repair for every defect over 1 cm, and the evidence is decisive. Primary suture repair fails because it closes a defect under tension in an avascular, collagen-weakened linea alba — recurrence climbs with defect size, reaching 50 percent for defects over 3 cm. Mesh distributes the load across the wall and holds recurrence under 5 percent regardless of size.[2]

The Kaufmann trial (Lancet, 2018) is the modern landmark — a randomised, double-blind, multicentre comparison of mesh versus suture repair of umbilical hernia in adults that confirmed mesh cuts recurrence without raising complications. With Arroyo (2005; recurrence 1 percent mesh versus 11 percent suture) and Abdel-Baki (2007; 0 percent mesh versus 20 percent Mayo), it ended routine suture repair.[2]

Four named repairs — Mayo, sublay, onlay, IPOM

Four operations recur in the viva, and each is examined for its plane and its failure mode. Name the plane and you name the repair.[1]

Mayo 'vest-over-pants' — the historical tension repair

The Mayo repair is historical, but it is still examined because it teaches why tension fails. Described by William J. Mayo in 1907, it was the standard for over 50 years.[1]

1. Transverse elliptical incision around the umbilicus (the umbilicus may be excised with the skin flap).
2. Dissect the sac circumferentially, open it, and reduce the contents.
3. Create overlapping fascial flaps — the superior flap pulled down over the inferior, like a vest over pants — and suture with non-absorbable interrupted sutures (originally silk).
4. No mesh.[1]

It failed because it is a tension repair under high intra-abdominal pressure, in an avascular linea alba, in patients with collagen weakness — recurrence 10 to 25 percent. It survives only for defects under 1 cm in fit patients, or as a historical foil. Its one gift to modern surgery is the overlap principle: mesh must overlap the defect by at least 4 to 5 cm.[1]

Open sublay (Rives-Stoppa) — the preferred open technique

The retrorectus sublay is the gold-standard open repair for defects of 2 to 10 cm. Mesh sits in a well-vascularised, extraperitoneal plane behind the rectus, incorporated under physiological tension and never touching bowel.[1]

1. Transverse infra-umbilical incision (vertical if combined with diastasis repair); preserve or excise the umbilicus.
2. Dissect to the anterior rectus sheath and identify the defect.
3. Open the anterior sheath vertically just lateral to the linea alba and develop the retrorectus plane between rectus muscle and posterior sheath, bilaterally.
4. Reduce the sac (do not excise unless needed); close the posterior sheath or peritoneum if possible to keep the repair extraperitoneal.
5. Place macroporous polypropylene (or composite) mesh in the retrorectus space, overlapping the defect by at least 4 to 5 cm in every direction.
6. Fix with absorbable sutures or fibrin sealant (full-thickness transfascial sutures add strength but cause more chronic pain).
7. Close the anterior sheath over the mesh, restoring muscle cover, and reconstruct the umbilicus.
8. Close skin.[1]

Advantages — extraperitoneal mesh (no bowel contact, no adhesions), a well-vascularised space (low infection), a mechanical dividend (intra-abdominal pressure pushes the mesh against the wall, holding it in), and recurrence under 5 percent. Disadvantages — more dissection than onlay, and it is not feasible when the posterior sheath is deficient (very low defects below the arcuate line), where an enhanced-view totally extraperitoneal (eTEP) modification is needed.[1]

Transversus Abdominis Release (TAR) extends the retrorectus repair for very large or recurrent defects: the posterior sheath is incised just lateral to the rectus and the transversus abdominis divided, creating a much larger plane reaching the retroperitoneum that accepts mesh widths up to 20 cm and allows medial advancement of the recti to close the midline. TAR is the modern workhorse of complex abdominal wall reconstruction.[1]

Open onlay mesh — easy but mechanically inferior

Onlay mesh sits on the anterior rectus sheath after primary closure of the defect — technically easier, mechanically worse.[1]

1. Close the fascial defect primarily.
2. Develop the prefascial (subcutaneous) plane over the anterior sheath.
3. Place mesh on the sheath with 4 to 5 cm overlap; fix with sutures, tackers, or glue.
4. Close skin over a suction drain.[1]

It is faster and useful in the obese where the retrorectus plane is difficult, but it pays for it: a higher seroma rate (5 to 15 percent) from wide subcutaneous dissection, a higher infection rate, and mesh outside the physiological pressure zone (intra-abdominal pressure tends to push it off the wall). Recurrence is higher than sublay.[1]

Laparoscopic IPOM — intraperitoneal onlay mesh

IPOM is the standard laparoscopic approach for defects over 3 to 4 cm. It is indicated for defects over 3 to 4 cm, recurrent hernia after open repair, obesity (BMI over 35), multiple defects, and bilateral paraumbilical hernias.[1]

1. Three ports (camera plus two working ports) — usually left upper quadrant optical Hasson entry for the camera and two 5 mm working ports.
2. Establish pneumoperitoneum and reduce the contents by traction.
3. Divide the falciform ligament so mesh lies flat against the upper anterior wall.
4. Measure the defect precisely from inside — the true size, often smaller than the external bulge.
5. Choose a composite mesh (anti-adhesive barrier on the bowel side, tissue-ingrowth surface on the wall side), sized to overlap by at least 4 to 5 cm.
6. Mark centre and orientation, insert through a port, and unroll intraperitoneally.
7. Fix with a double-crown of absorbable tackers plus transfascial sutures (Carter-Thomason or suture-passer) at four to eight peripheral points — sutures for strength, tackers for contour.
8. Close all port sites over 5 mm and desufflate.[1]

It buys faster recovery, smaller wounds, less wound morbidity, the ability to survey the whole wall for occult defects, and less postoperative pain. It costs bowel contact (hence the mandatory composite mesh, with adhesion, erosion, and fistula risk), general anaesthesia, the price of composite mesh, and it cannot be used in contaminated fields. The catastrophic trap is an unrecognised enterotomy at port entry or adhesiolysis — always inspect bowel before closure.[1]

IPOM-plus closes the fascial defect transcutaneously with a suture-passer before placing the mesh, restoring wall anatomy and cutting seroma and bulging. And eTEP and robotic approaches (popularised by Belyansky and Daes) place a retrorectus, extraperitoneal mesh without entering the peritoneum, combining laparoscopy with extraperitoneal mesh; robotic assistance enables suturing in deep retrorectus planes and a minimally invasive TAR. These are increasingly standard in tertiary centres for complex ventral hernia.[1]

Component separation — for the massive defect over 10 cm

Component separation is reserved for massive incisional hernias, recurrence with loss of domain, and post-damage-control laparostomy. Its goal is always fascial closure, reinforced by mesh.[1]

1. Open approach: raise large subcutaneous flaps to expose the lateral wall to at least the anterior axillary line.
2. Divide the external oblique aponeurosis longitudinally 1 to 2 cm lateral to the linea semilunaris, separating external from internal oblique in the relatively avascular plane between them.
3. This releases the external oblique laterally and allows medial advancement of the rectus complex — up to 10 cm per side in the upper abdomen, 5 cm at the waist, 3 cm suprapubically.
4. Close the midline fascia primarily.
5. Reinforce with mesh in the retrorectus or onlay position (component separation alone, without mesh, recurs).
6. The endoscopic, perforator-sparing version preserves perforator vessels to the skin, sharply reducing wound morbidity (seroma, necrosis, infection).[1]

Its complications are wound breakdown and skin necrosis (large flaps, denervation), seroma, haematoma, recurrence (especially without mesh), and lateral abdominal wall weakness or bulging from denervation.[1]

The mesh shelf — synthetic, composite, biological

Mesh selection is a high-yield viva topic and a common MCQ trap. Match the mesh to the field, or the field will reject it.[2]

Synthetic non-absorbable meshes are the workhorses:[2]

• Polypropylene (PP) — macroporous (pore size over 1 mm), excellent tissue ingrowth, strong; the default for sublay and onlay (Prolene, Marlex). It shrinks 20 to 30 percent, stiffens, and adheres and fistulates if placed intraperitoneally — hence contraindicated in IPOM. Lightweight large-pore PP reduces shrinkage and chronic pain.
• Polyester (PE) — softer, more flexible, macroporous; good conformability; used in some composites (Parietex).
• Expanded PTFE (ePTFE, Gore-Tex) — microporous, no tissue ingrowth (fewer adhesions but less fixation, higher recurrence); used in older IPOM, largely replaced by composites.[2]

Composite meshes pair a tissue-ingrowth layer (macroporous PP or PE on the parietal side) with an anti-adhesive barrier on the visceral side, and are mandatory whenever mesh will touch bowel (IPOM, or when the posterior sheath cannot be closed):[2]

• Proceed — PP plus oxidised regenerated cellulose.
• Physiomesh — PP plus polyglecaprone (absorbable barrier).
• C-Qur — PP plus omega-3 fatty acid coating.
• Parietex Composite — polyester plus collagen-hyaluronic acid barrier.[2]

Absorbable synthetics (TIGR, Phasix) degrade over 6 to 24 months; they bridge contaminated fields where permanent mesh is contraindicated, with definitive repair later — weaker than permanent mesh as a sole repair. Biological meshes (human acellular dermis AlloDerm; porcine dermal collagen Permacol, Strattice; bovine pericardium Tutopatch) are decellularised collagen matrices that become vascularised tissue, reserved for contaminated or infected fields, enterocutaneous fistula repair, or bridging after necrotising fasciitis debridement. They are inferior to synthetic mesh in clean elective repair (higher recurrence and eventration, and very expensive); the RICH trial (Rosen, 2010) of Strattice in contaminated ventral hernia showed reasonable but not superior outcomes.[2]

The selection grid:[2]

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The cirrhotic — optimise before you operate

The cirrhotic with an umbilical hernia is the highest-risk elective hernia scenario in surgery, and a favourite exam topic. Ascites raises intra-abdominal pressure, rectus diastasis from muscle wasting widens the linea alba, hypoalbuminaemia impairs collagen healing, and the recanalised paraumbilical veins (Crueveilhier-Baumgarten) stretch the ring. The result is high rates of incarceration, strangulation, and spontaneous rupture — the last with fatal peritonitis from infected ascites.[1]

The risk profile is stark. Surgical mortality is roughly 5 to 14 percent elective and 50 percent or more emergency. The strategy is therefore to optimise the liver first, then repair:[1]

1. Optimise cirrhosis — aggressive diuresis (spironolactone 100 mg daily plus furosemide 40 mg daily, titrated to a 100 to 40 ratio, max 400 mg and 160 mg), salt restriction (under 2 g sodium a day), albumin for hypoalbuminaemia, and treat the cause (alcohol abstinence, antivirals).
2. Control ascites — large-volume paracentesis with albumin replacement if refractory, and TIPS (transjugular intrahepatic portosystemic shunt) to lower portal pressure before elective surgery.
3. Correct coagulopathy — vitamin K, fresh frozen plasma, and platelets to an INR under 1.5 and platelets over 50 before surgery.
4. Child-Pugh A or B (and MELD under 15) — elective mesh repair after optimisation; morbidity similar to non-cirrhotics.
5. Child-Pugh C (or MELD over 18) — very high risk; defer and refer for liver transplant evaluation. Emergency surgery only for strangulation or perforation, often as damage control.
6. Elective technique — open sublay (retrorectus) with macroporous polypropylene mesh; extraperitoneal mesh avoids bowel contact and resists infection better than IPOM. Avoid IPOM in cirrhotics.[1]

The emergency that must not be missed — spontaneous rupture. Ascites leaks through thinned, ulcerated skin, sometimes with bowel evisceration; peritonitis from infected ascites, sepsis, and electrolyte disturbance follow. Resuscitate, give broad-spectrum antibiotics, and operate (primary closure or biological mesh in the contaminated field), with aggressive post-op ascites control. Mortality is 30 to 50 percent.[1]

Pregnancy, obesity, and the frail elderly

Pregnancy drives hernias through raised pressure, rectus diastasis, and relaxin-driven collagen remodelling — and most close spontaneously within 3 to 6 months of delivery, so repair is deferred unless strangulated. A symptomatic but reducible hernia gets a supportive garment (maternity belt) and monitoring; surgery during pregnancy is only for incarceration or strangulation, ideally in the second trimester (after organogenesis, before the uterus blocks access and preterm labour risk peaks). Postpartum, mesh a defect over 2 cm that persists after 6 months, and counsel on recurrence in future pregnancy — ideally complete the family before definitive repair.[1]

Obesity is the commonest risk factor for both developing and recurring an umbilical hernia. Pre-operative weight loss (target BMI under 35, ideally under 30) cuts wound complications, recurrence, and anaesthetic risk; laparoscopic IPOM is preferred for the very obese (small wounds, fewer wound complications), and bariatric surgery may precede or combine with repair in the morbidly obese with a reducible hernia.[1]

The frail elderly force a balance of operative risk against the risk of emergency presentation. In the very frail with a small reducible hernia, conservative management with a truss (an external pressure device) may be appropriate — but trusses are uncomfortable, ulcerate the skin over a tense hernia, and do not prevent strangulation.[1]

The emergency — operate now

A strangulated umbilical hernia is a surgical emergency measured in hours, not days. Know the two presentations and the bundle.[1]

Incarcerated — try taxis, then stop

An incarcerated hernia is irreducible and painful, with early or no obstruction. Omentum alone gives no obstruction; bowel gives vomiting and distension. Attempt taxis — gentle manual reduction with the patient in Trendelenburg, adequate opioid analgesia, and a benzodiazepine for muscle spasm. If it succeeds, schedule elective repair within 24 to 48 hours (it will re-incarcerate). Never force taxis in a struggling, septic child or any patient with skin changes — strangulation is likely. Do not persist beyond 30 minutes, and never attempt taxis if there are signs of strangulation.[1]

Strangulated — the bundle and the table

Strangulation means severe constant pain, a tense tender irreducible mass, and overlying erythema or duskiness (a late sign of necrosis). Add the obstructive quartet — vomiting, distension, absolute constipation, hyperactive then absent bowel sounds — and systemic sepsis (tachycardia, hypotension, fever, raised lactate and WCC), which is late and ominous.[1]

The bundle, in order:[1]

1. Resuscitate — oxygen, two large-bore cannulae, crystalloid boluses, a nasogastric tube to decompress the stomach, a urinary catheter to monitor output, and broad-spectrum antibiotics (co-amoxiclav 1.2 g IV plus metronidazole 500 mg IV, or piperacillin-tazobactam 4.5 g IV).
2. Bloods — FBC, U and E, LFTs, amylase, lactate, coagulation, group and save; crossmatch 2 to 4 units if laparotomy is likely.
3. Imaging — erect CXR or AXR for obstruction, but do not delay surgery for imaging if it is clinically strangulated.
4. Surgery — explore via the hernia incision extended as needed, or midline laparotomy if there is peritonitis. Judge the bowel: pink and peristalsing — reduce and repair; dusky — warm packs and re-assess in 10 minutes; non-viable (black, no peristalsis, dull serosa) — resect with primary anastomosis if clean, or a stoma if grossly contaminated. Always check the bowel proximally and distally, and remember the Maydl W-loop.
5. Hernia repair — primary closure or biological mesh if contaminated (synthetic mesh in a contaminated field infects readily); definitive mesh repair at a second stage if needed.[1]

After the knife — seroma, pain, recurrence

Most elective repairs are day-case surgery. Analgesia is regular paracetamol 1 g four times daily plus an NSAID (ibuprofen 400 mg three times daily, or diclofenac 50 mg three times daily if not contraindicated) for 5 to 7 days, with a short course of weak opioid (codeine 30 to 60 mg, up to four times daily as needed) for the first 48 hours. Mobilise early, feed early, and avoid heavy lifting (over 10 kg) and strenuous abdominal exercise for 4 to 6 weeks while the mesh incorporates. Return to work is 1 to 2 weeks for desk or light duties and 4 to 6 weeks for manual labour; keep the wound dry for 48 hours, then shower, with no baths or swimming for 2 weeks.[1]

The complication grid every candidate must reproduce:[1]

[1]

Seroma — the commonest complication

The post-herniorrhaphy seroma is inflammatory fluid in the dead space left after sac excision, and most resolve without intervention within 6 to 12 weeks. Repeated aspiration risks infection, so do not aspirate a sterile seroma unless it is tense, painful, threatens the overlying skin, or persists beyond 3 months. Prevent it with meticulous haemostasis, obliteration of dead space, defect closure (IPOM-plus), and an abdominal binder.[1]

Chronic post-herniorrhaphy pain

Chronic pain persists beyond 3 months and is usually neuropathic — nerve entrapment (ilioinguinal, iliohypogastric, or the tenth intercostal nerve) by a suture or tacker, a neuroma, or mesh-related inflammation. Manage stepwise: reassurance and time, simple analgesia, then neuropathic agents (gabapentin 300 mg three times daily titrated, pregabalin, amitriptyline 10 to 25 mg nocte), an ultrasound-guided nerve block with local anaesthetic with or without steroid, and finally surgical exploration with neurectomy or mesh removal in refractory cases. Prevent it at the index operation by avoiding full-thickness transfascial sutures near the nerves and using absorbable tackers.[1]

The trials that ended suture repair

The European Hernia Society guidelines set the modern rule: mesh for every primary ventral hernia over 1 cm, sublay over onlay, suture only for under 1 cm. Pre-operative optimisation of risk factors (smoking cessation 4 weeks, weight loss, diabetic control) is strongly recommended, and laparoscopic IPOM is the alternative for defects over 3 to 4 cm or recurrent hernias.[2]

The landmark trials an examiner expects:[2]

• Arroyo (2005) — mesh versus suture for umbilical hernia (defects 1 to 5 cm): recurrence 1 percent mesh versus 11 percent suture. The trial that ended routine suture repair.
• Abdel-Baki (2007) — mesh versus Mayo: recurrence 0 percent mesh versus 20 percent Mayo. The Mayo repair abandoned for defects over 1 cm.
• Kaufmann (2018, Lancet) — mesh versus suture, randomised double-blind multicentre: mesh cuts recurrence in adults without raising complications. The modern confirmatory RCT.
• Saleh (2016) — laparoscopic IPOM versus open mesh: similar recurrence, less pain, faster recovery with laparoscopy.[2]

The classification that grades recurrence risk

The Ventral Hernia Working Group (VHWG) classification grades the wound by contamination and predicts recurrence and outcome. Hodgkinson's 2021 population study using English Hospital Episode Statistics validated it for long-term outcome — higher grade means higher recurrence and complication risk, and drives mesh choice (synthetic in clean grades, biological or absorbable in contaminated).[4]

The ventral hernia types relevant to the umbilical and epigastric region:[4]

[4]

Recovery, follow-up, and prognosis

Mesh integrates fully over 1 to 3 months — fibroblastic ingrowth is complete by 6 to 8 weeks, and the scar matures over the same window. Day 0 is surgery and oral analgesia; days 1 to 7 are wound care, analgesia, and light activity, with expected bruising and mild swelling; weeks 1 to 2 see return to office work and wound healing, and a seroma may appear (reassure); weeks 2 to 4 allow moderate activity with no heavy lifting (over 10 kg); by weeks 4 to 6 there is full recovery and return to manual labour and exercise.[1]

Follow-up is a 2-week wound check (healing, seroma, infection) and a 6-week full review (recovery, chronic pain, return to full activity). Return sooner for wound infection (increasing redness, discharge, fever), an expanding seroma or haematoma, severe worsening pain, or recurrence (the bulge returning). Long term, recurrence usually presents within 2 years, so counsel patients on lifelong risk-factor modification — weight loss, smoking cessation, and treating chronic cough or constipation.[1]

Prognosis by group. Paediatric: excellent — 95 percent spontaneous closure, surgical recurrence under 1 percent. Adult elective mesh: recurrence under 5 percent, chronic pain 5 to 10 percent, full activity by 6 weeks. Cirrhotic elective (Child-Pugh A or B): acceptable morbidity and mortality after optimisation, slightly higher recurrence. Emergency or strangulated: mortality 5 to 14 percent overall, 30 to 50 percent in cirrhotics with rupture, with morbidity driven by bowel resection and contamination.[1]

The mantra, and the mnemonics

[1] [1]

The mantra: infants watch and wait — 95 percent close by 5; adults repair with mesh, because they never close spontaneously; and a tender irreducible umbilical hernia is a Richter's until proven otherwise.[1]

Ward-round test — three stems

Stem 1 — the baby at the clinic (answer)

A healthy 6-month-old has a soft, reducible umbilical bulge that appears on crying. The ring is 0.8 cm and the skin is healthy. What do you do? Model: Reassure and observe — this will almost certainly close spontaneously. Ninety-five percent of infantile umbilical hernias close by age 5, and rings under 1 cm close fastest. Run the cover test at each clinic visit to stratify closure, and reserve surgery for persistence after age 4 to 5, a defect over 1.5 cm, incarceration (rare, under 1 percent), or progressive enlargement. Never use mesh in a child.[3]

Stem 2 — the cirrhotic with a dusky umbilical lump (answer)

A 56-year-old with alcoholic cirrhosis, tense ascites, and a hard, tender, irreducible umbilical lump with dusky overlying skin. No vomiting, no distension, bowels open. What is this, and what do you do? Model: This is a strangulated Richter's hernia — only the anti-mesenteric border of bowel is trapped, the lumen is patent, so it strangulates without obstructing. It is a surgical emergency. Resuscitate (oxygen, IV access, fluids, nasogastric tube, urinary catheter), give broad-spectrum antibiotics, correct coagulopathy toward INR under 1.5 and platelets over 50, and take the patient to theatre. At the table, judge bowel viability — resect the non-viable with primary anastomosis if clean or a stoma if contaminated — and use primary closure or biological mesh in the contaminated field, deferring definitive mesh repair. Mortality in cirrhotic emergency surgery is 30 to 50 percent or higher.[1]

Stem 3 — the trap that is not a hernia (answer)

A 60-year-old man is referred for an elective umbilical hernia repair. He has a soft, painless, longitudinal midline bulge above the umbilicus that appears on sitting up and vanishes when he lifts his head off the bed. There is no cough impulse at a ring. What is the diagnosis, and do you operate? Model: This is diastasis recti — a widened linea alba with no true fascial defect, no cough impulse at a ring, and it disappears on neck flexion. It is not a hernia, and operating on it is the classic error; management is reassurance, or cosmetic or functional consideration only. The discriminator from a true hernia is the absence of a fascial defect and a ring with a cough impulse. Note also that a hard, fixed umbilical nodule in an older patient is a Sister Mary Joseph nodule — metastatic, not a hernia.[1]

References

1. [1]Henriksen NA, Montgomery A, Kaufmann R, Berrevoet F, East B, Fischer J, Hope W, Klassen D, Lorenz R, Renard Y, Garcia Urena MA, Simons MP; European and Americas Hernia Societies. Guidelines for treatment of umbilical and epigastric hernias from the European Hernia Society and Americas Hernia Society. Br J Surg, 2020.PMID 31916607
2. [2]Kaufmann R, Halm JA, Eker HH, et al. Mesh versus suture repair of umbilical hernia in adults: a randomised, double-blind, controlled, multicentre trial. Lancet, 2018.PMID 29459021
3. [3]Hills-Dunlap JL, Melvin P, Graham DA, et al. Variation in surgical management of asymptomatic umbilical hernia at freestanding children's hospitals. J Pediatr Surg, 2020.PMID 31255325
4. [4]Hodgkinson JD, Worley G, Warusavitarne J, et al. Evaluation of the Ventral Hernia Working Group classification for long-term outcome using English Hospital Episode Statistics: a population study. Hernia, 2021.PMID 33712933