Inguinal Hernia Repair

Read More from the Source PDF

Open Lichtenstein tension-free mesh repair is the default workflow below; laparoscopic (TEP/TAPP) and robotic are covered as shorter parallel sections. For the underlying anatomy and board-level background, see the hernias topic review.

Procedure Snapshot

• Indication: Symptomatic or incarcerated inguinal hernia. Watchful waiting is acceptable for asymptomatic/minimally symptomatic men per Fitzgibbons 2006¹ — but most cross over to repair within ~10 years.
• Expected duration: 45–75 min open unilateral; 60–90 min lap/robotic unilateral; +30–45 min for bilateral.
• Positioning: Supine, arms out. Slight Trendelenburg helps reduce the sac for open cases in large patients.
• Special instruments (open): Lichtenstein mesh (polypropylene, ~7×15 cm), 2-0 or 3-0 permanent monofilament (Prolene) or slowly-absorbing (PDS), Army-Navy retractors, fine Debakey forceps.
• Special instruments (lap/robotic): 10 mm 30° or 0° camera, balloon dissector (TEP), preformed or self-gripping mesh (ProGrip, Progrip-laparoscopic), absorbable tacker or fibrin glue.
• Preop: Mark the side(s). Single preop dose of cefazolin is reasonable for mesh repair; ESPAGHUS/SCIP does not mandate it for clean open cases but most attendings give it.
• Regional vs general: Open Lichtenstein can be done under local + sedation (classic Shouldice hospital approach). Lap/robotic requires GA + paralysis.

---

Step Workflow — Open Lichtenstein (primary)

1. Exposure
   • Oblique skin incision ~2 fingerbreadths above and parallel to the inguinal ligament, extending from the pubic tubercle laterally 5–7 cm.
   • Divide Scarpa’s fascia; identify and preserve/ligate the superficial epigastric and external pudendal vessels.
   • Open the external oblique aponeurosis in the direction of its fibers from the external ring laterally. Identify and protect the ilioinguinal nerve as the aponeurosis is opened — this is the most commonly injured nerve in open repair.
2. Cord Mobilization
   • Bluntly encircle the cord at the pubic tubercle with a Penrose or vessel loop.
   • Sweep the cremaster off the cord anteriorly; some surgeons divide the cremaster circumferentially at the internal ring (“cremasteric release”). Preserve the genital branch of the genitofemoral running along the deep surface of the cord.
   • Identify the iliohypogastric nerve on the internal oblique; it usually runs cephalad to the inguinal canal and can be swept out of harm’s way.
3. Identify and Treat the Sac
   • Indirect sac: lies anteromedial to the cord structures. Dissect free from the cord down to the level of the internal ring. Open the sac if concerned for bowel; otherwise high-ligate at the internal ring with a 2-0 absorbable suture (or reduce without ligation — equivalent outcomes in most series).
   • Direct sac: bulges from the floor medial to the inferior epigastrics. Does not need to be opened or ligated; invert and hold with a purse-string or simple running stitch in the transversalis to flatten the floor.
   • If you can’t find a hernia after skeletonizing the cord: open the floor and look for a concurrent femoral hernia (missed femoral hernia is the classic teaching point).
4. Lichtenstein Mesh Placement
   • Cut a polypropylene mesh to shape (~7–8 × 15 cm). Slit the lateral portion to create two tails for the cord.
   • Overlap the pubic tubercle by 1.5–2 cm medially (do not suture into the periosteum — source of osteitis pubis / chronic pain).
   • Secure the inferior edge to the shelving edge of the inguinal ligament with a running 2-0 Prolene from pubic tubercle to just lateral to the internal ring.
   • Secure the superior edge to the conjoint tendon / internal oblique aponeurosis with interrupted 2-0 Prolene — take aponeurotic bites only, not muscle, to avoid iliohypogastric entrapment.
   • Cross the tails of the mesh around the cord at the new internal ring and secure them to the inguinal ligament with a single suture. Keep the ring snug but not tight — a fingertip should pass alongside the cord.
5. Closure
   • Re-approximate the external oblique aponeurosis with a running 2-0 Vicryl; keep bites superficial to avoid the ilioinguinal nerve.
   • Scarpa’s with 3-0 Vicryl, skin with 4-0 Monocryl subcuticular.
   • Inject the incision and deeper tissues with local (bupivacaine ± lidocaine) if not already done.

---

Step Workflow — Laparoscopic TEP (parallel option)

1. Positioning / ports: Supine, arms tucked, monitor at the foot. Infra-umbilical cutdown to the anterior rectus sheath; enter the preperitoneal space posterior to the rectus but anterior to the posterior sheath. Insert balloon dissector aimed at the pubic symphysis and insufflate under camera visualization until the pubic symphysis and Cooper’s ligament are visible. Place two midline working ports (5 mm).
2. Preperitoneal dissection: Develop the space of Retzius medially (Cooper’s ligament, pubic symphysis); sweep laterally to expose the myopectineal orifice of Fruchaud — bounded by rectus medially, iliopsoas laterally, iliopubic tract superiorly, and pectineus/Cooper’s inferiorly.
3. Reduce the hernia: Indirect sacs must be peeled off the cord structures (“parietalization of the cord”). Direct sacs reduce easily; femoral hernias are identified medial to the femoral vein.
4. Mesh placement: Cover the entire myopectineal orifice with a 15 × 10–15 cm flat or preformed mesh. Overlap at least 3 cm in each direction. Fix only to Cooper’s ligament and above the iliopubic tract (avoid Triangle of Doom and Triangle of Pain).
5. Desufflate under direct vision to allow the peritoneum to drape back over the mesh — if it doesn’t, you’ve violated the peritoneum and need to close the defect or convert to TAPP.

Step Workflow — Laparoscopic TAPP (parallel option)

1. Transabdominal access via Veress or Hasson at umbilicus; two lateral working ports.
2. Incise the peritoneum 4–5 cm above the internal ring from the medial umbilical ligament to the ASIS.
3. Develop the same preperitoneal plane as TEP; reduce hernia, place mesh covering the myopectineal orifice.
4. Close the peritoneum over the mesh (running suture or tacks) — this is the key extra step vs TEP and the main site of postoperative bowel adhesions if done poorly.

Step Workflow — Robotic (parallel option)

• Equivalent to TAPP from a dissection standpoint; the robot improves ergonomics and allows sutured peritoneal closure rather than tacks.
• Typical setup: three 8 mm robotic ports across the upper abdomen, patient supine with steep Trendelenburg. Dock from the foot of the bed.
• Suture fixation of mesh (rather than tacks) is routine — reduced risk of nerve entrapment compared with laparoscopic tack fixation.

---

Rapid-Fire Questions

• Q: Direct vs indirect — how do you tell?
  A: Relative to the inferior epigastric vessels: lateral = indirect (through the internal ring, congenital, patent processus vaginalis); medial = direct (through Hesselbach’s floor, acquired from chronic pressure).

• Q: What defines Hesselbach’s triangle?
  A: Medial — lateral edge of the rectus. Inferior — inguinal ligament. Lateral — inferior epigastrics.

• Q: Contents of the spermatic cord?
  A: Three arteries (testicular, cremasteric, artery to the vas), three nerves (ilioinguinal — along the cord superficially, genital branch of genitofemoral — on the cord deeply, sympathetics), three others (vas deferens, pampiniform plexus, lymphatics).

• Q: Three nerves at risk in open repair?
  A: Ilioinguinal (MC injured — opening external oblique), iliohypogastric (superior), genital branch of the genitofemoral (along the cord posteriorly).

• Q: Most commonly injured nerve in laparoscopic repair?
  A: Lateral femoral cutaneous nerve, from a tack placed laterally below the iliopubic tract (Triangle of Pain).

• Q: Contents of the Triangle of Doom?
  A: External iliac vessels. Bounded by vas deferens medially, spermatic vessels laterally, apex at the iliopubic tract. No tacks.

• Q: Contents of the Triangle of Pain?
  A: Lateral femoral cutaneous, femoral branch of genitofemoral, femoral nerve. Lateral to the spermatic vessels, below the iliopubic tract. No tacks.

• Q: Skeletonized the cord and can’t find a hernia — now what?
  A: Open the floor and look for a femoral hernia.

• Q: Lichtenstein — where do you not sew mesh?
  A: Not into the periosteum of the pubic tubercle (osteitis pubis / chronic pain), and not deep into muscle on the superior edge (iliohypogastric entrapment).

• Q: Recurrence rate of Lichtenstein?
  A: Roughly 1–4% at long-term follow-up in modern series;² comparable to laparoscopic repair after the surgeon’s learning curve.

• Q: Chronic groin pain after open repair — how common?
  A: ~10–12% report any chronic pain at 1 year, ~2–4% report it as disabling.³ Lower after lap/robotic repair in most series.

• Q: Incarcerated or strangulated hernia needing bowel resection — what mesh?
  A: Avoid permanent synthetic in a contaminated field. Use a biologic mesh or a pure tissue repair (Bassini / McVay).

• Q: Young athletic patient, bilateral symptomatic inguinal hernias — open or lap?
  A: Laparoscopic/robotic — single anesthetic, both sides through the same ports, faster return to activity.

• Q: Watchful waiting — in whom is it reasonable?
  A: Asymptomatic or minimally symptomatic men (Fitzgibbons trial¹). Not appropriate for women (higher femoral hernia prevalence and strangulation risk) or symptomatic patients.

---

Critical Anatomy — Buzzword Glossary

Groin anatomy is dense with eponyms and near-identical-sounding structures. Every one of these gets asked on rounds. Learn them cold.

Bony landmarks

• ASIS (anterior superior iliac spine) — lateral attachment of the inguinal ligament. Reference for lap port placement and for the lateral edge of the inguinal canal incision.
• Pubic tubercle — the palpable bony bump ~1.5–2 cm lateral to the midline on the superior pubic ramus. Medial attachment of the inguinal ligament. This is the landmark you must overlap by ≥ 1.5 cm with the medial edge of your Lichtenstein mesh. A repair that “looks pretty but doesn’t overlap the tubercle” recurs medially.
• Pubic symphysis — the midline fibrocartilaginous joint between the two pubic bones. Not the same as the tubercle. The symphysis is at the midline; the tubercle is ~1.5–2 cm lateral on each side. Classic oral-board distinction — mesh overlap is measured from the tubercle, not the symphysis.
• Pecten pubis — the sharp ridge running laterally along the superior pubic ramus from the tubercle. Cooper’s ligament sits on this ridge.

Ligaments of the groin

• Inguinal (Poupart’s) ligament — the rolled-under inferior edge of the external oblique aponeurosis, from ASIS to pubic tubercle. Its deep surface forms the shelving edge — this is where you run your inferior mesh suture in Lichtenstein.
• Lacunar (Gimbernat’s) ligament — the triangular medial reflection of the inguinal ligament as it inserts onto the pecten pubis. Forms the medial border of the femoral canal / femoral ring. Classic teaching: to release a strangulated femoral hernia, divide the lacunar ligament medially (aberrant obturator artery may cross here — corona mortis risk).
• Cooper’s (pectineal) ligament — the thick white fibrous reinforcement of the periosteum along the pecten pubis, named for Sir Astley Cooper. A continuation of the lacunar ligament laterally along the superior ramus. The anchor of the McVay repair and the inferomedial fixation point for all posterior mesh repairs (TEP/TAPP/robotic).
• Iliopubic tract — the posterior (preperitoneal) analog of the inguinal ligament. A thickening of the transversalis fascia from ASIS/iliopsoas fascia medially to Cooper’s ligament. You see the iliopubic tract — not the inguinal ligament — when you’re looking from behind. Tacks fixed above the iliopubic tract are safe; tacks below it put you in the Triangle of Doom / Triangle of Pain.
• Reflected inguinal ligament (Colles’ ligament) — fibers from the contralateral side crossing behind the superficial ring to the linea alba. Minor surgical significance; occasional buzzword.

Aponeurosis, muscle, and tendon

• External oblique aponeurosis — the roof of the inguinal canal. Contains the superficial (external) inguinal ring at its medial inferior end. First layer you open in Lichtenstein.
• Internal oblique — the middle muscle layer; contributes to the conjoint tendon medially. Gives rise to the cremaster muscle fibers that sheath the cord.
• Transversus abdominis — the deepest muscle layer; contributes the other half of the conjoint tendon. Its lower arch forms the superior margin of the internal ring.
• Conjoint tendon (inguinal falx) — the fused tendinous insertion of internal oblique + transversus abdominis onto the superior pubic ramus medially. Forms the medial floor of the inguinal canal. This is what your superior mesh edge is sewn to in Lichtenstein — take aponeurotic bites only, not deep into muscle (iliohypogastric entrapment).
• Transversalis fascia — the true floor of the inguinal canal. Failure of this layer medial to the inferior epigastrics = direct hernia pushing through Hesselbach’s.
• Cremaster muscle — slips of internal oblique that descend with the cord, envelop the cord, and retract the testis. Innervated by the genital branch of the genitofemoral nerve. Swept off the cord during mobilization; some surgeons divide it circumferentially at the internal ring.

Inguinal canal (open view)

• Boundaries:
  • Roof — external oblique aponeurosis (laterally also internal oblique).
  • Floor — transversalis fascia (reinforced medially by the conjoint tendon).
  • Anterior wall — external oblique aponeurosis ± reinforcement by internal oblique laterally.
  • Posterior wall — transversalis fascia ± reinforcement by the conjoint tendon medially.
• Openings:
  • Superficial (external) ring — opening in the external oblique aponeurosis just above and lateral to the pubic tubercle.
  • Deep (internal) ring — opening in the transversalis fascia just lateral to the inferior epigastric vessels. Indirect hernias pass through here, lateral to the epigastrics.
• Contents of the spermatic cord — the “rule of threes”:
  • Three arteries: testicular, cremasteric, artery to the vas.
  • Three nerves: ilioinguinal (technically runs alongside, not within, the cord), genital branch of genitofemoral (on the posterior cord), autonomic/sympathetic fibers.
  • Three other structures: vas deferens, pampiniform venous plexus, lymphatics.
• Hesselbach’s triangle — medial: lateral border of rectus; inferior: inguinal ligament; lateral: inferior epigastric vessels. Direct hernias push through the floor of this triangle.

Nerves seen during open (anterior) repair — with function

• Ilioinguinal nerve (L1) — sensory to the medial thigh, mons pubis / base of penis, anterior scrotum (or labia majora) in women. Runs within the inguinal canal, anterior to the cord, deep to the external oblique aponeurosis. First nerve you see when you open the external oblique — and the most commonly injured nerve in open repair. Protect during mesh placement (avoid burying in sutures). If unavoidable, clean transection → bury the proximal stump in muscle (pragmatic neurectomy) — produces less chronic pain than a stretched or partially injured nerve.
• Iliohypogastric nerve (L1) — sensory to the skin over the suprapubic area and lateral upper buttock. Runs on the surface of the internal oblique, cephalad to the inguinal canal. At risk during the superior mesh sutures to the conjoint tendon — take aponeurotic bites, not deep muscle, to avoid entrapment.
• Genital branch of the genitofemoral nerve (L1–L2) — motor to the cremaster muscle (mediates the cremasteric reflex) and sensory to the scrotum (or mons / labia majora). Runs within the cord, on its posterior surface (deep to the cord when you lift it up). Protected during cremaster sweep and sac mobilization. Injury → loss of cremasteric reflex + scrotal dysesthesia.

Pragmatic point: all three of these nerves are L1-predominant and their sensory territories overlap heavily in the groin/scrotum. Clinical differentiation after injury is often imprecise; triple neurectomy (all three) is the definitive operation for refractory post-herniorrhaphy neuralgia.

Nerves seen during posterior (laparoscopic / robotic / TEP / TAPP) repair — with function

When you’re in the preperitoneal space looking at the back wall of the groin, you see a different set of nerves. Most of them live below the iliopubic tract, which is why no tacks go below the iliopubic tract lateral to the cord structures.

• Genitofemoral nerve (L1–L2) — emerges from the surface of the psoas and descends on the psoas muscle as a shiny thin white line. Splits into:
  • Genital branch — enters the internal ring with the cord (see above).
  • Femoral branch — passes under the inguinal ligament lateral to the femoral artery to supply skin of the upper anterior thigh (femoral triangle). Sensory only. Classic Triangle of Pain nerve. Injury → anterior upper-thigh numbness ± chronic neuropathic pain. Caused by tacks placed into psoas lateral to the spermatic vessels.
• Lateral femoral cutaneous nerve (L2–L3) — pure sensory — anterolateral thigh. Emerges from the lateral border of the psoas, runs over the iliacus toward the ASIS, passes under the inguinal ligament ~1–2 cm medial to the ASIS. Entrapment here = meralgia paresthetica (burning, tingling, numb anterolateral thigh). Second classic Triangle of Pain nerve — injured by lateral tacks below the iliopubic tract.
• Femoral nerve (L2–L4) — motor to the quadriceps; sensory to anteromedial thigh and medial leg via saphenous branch. Lies deep to the iliopsoas fascia, lateral to the femoral artery — usually protected if the iliopubic tract is respected. Aggressive deep lateral fixation can still injure it → quadriceps weakness + saphenous anesthesia.

The “Three P’s” of posterior nerves — each of these runs posterior to the preperitoneal view and is protected by staying above the iliopubic tract:

1. Psychosocial disaster if you tack it → Lateral femoral cutaneous (meralgia).
2. Anterior thigh numbness → Genitofemoral (femoral branch).
3. Quadriceps weakness → Femoral nerve.

Myopectineal orifice of Fruchaud

The single weak opening in the posterior abdominal wall through which all groin hernias emerge. Remembered as the target that posterior mesh must cover in its entirety.

• Superior: internal oblique + transversus abdominis arch (conjoint region).
• Medial: lateral edge of rectus abdominis.
• Inferior: pecten pubis (Cooper’s ligament).
• Lateral: iliopsoas.
• Divided horizontally by the iliopubic tract:
  • Above the tract → indirect (lateral to epigastrics) and direct (medial to epigastrics through Hesselbach’s) inguinal hernias.
  • Below the tract → femoral hernia (medial to the femoral vein).
• Posterior mesh (≥ 10 × 15 cm, overlap ≥ 3 cm on all sides) must cover the entire orifice to prevent all three hernia types.

Triangles to commit to memory

• Hesselbach’s triangle — medial: lateral rectus; inferior: inguinal ligament; lateral: inferior epigastrics. Floor of direct hernias.
• Triangle of Doom — medial: vas deferens; lateral: spermatic vessels; apex: internal ring. Contents: external iliac artery and vein. No tacks. No cautery.
• Triangle of Pain — medial: spermatic vessels; lateral/superior: iliopubic tract; inferior: inferior border of iliopubic tract. Contents: lateral femoral cutaneous, femoral branch of genitofemoral, and (deeper) femoral nerve. No tacks.

Corona mortis (“crown of death”)

Aberrant anastomosis between the obturator artery/vein and the external iliac (or inferior epigastric) vessels, crossing the superior pubic ramus behind Cooper’s ligament. Present in ~20–30% of patients. Injured by:

• Aggressive suture or tack placement at Cooper’s ligament in McVay or TEP/TAPP.
• Dividing the lacunar ligament medially to release an incarcerated femoral hernia.

If torn, bleeding is brisk and retracts into the obturator foramen — pack, pressure, sutured control. Do not blindly cauterize.

Danger zones summary (all approaches)

• Ilioinguinal at opening of external oblique (open).
• Iliohypogastric on superior mesh bites (open).
• Genital branch of genitofemoral on the posterior cord (open).
• Lateral femoral cutaneous and femoral branch of genitofemoral in Triangle of Pain (lap/robotic).
• External iliac vessels in Triangle of Doom (lap/robotic).
• Corona mortis behind Cooper’s (any Cooper’s-fixation repair).
• Femoral vein with deep floor bites in McVay or aggressive Bassini.
• Bladder medially on sliding direct hernias.
• Vas / testicular vessels with aggressive cord skeletonization → ischemic orchitis.

---

Informed Consent Highlights

• Risks:
  • Recurrence ~ 1–4% with mesh repair;² higher without mesh or in pure tissue repairs.
  • Chronic groin pain ~ 10–12% at 1 year, 2–4% disabling.³
  • Seroma / hematoma ~ 5–10%, most resolve without intervention.
  • Surgical site infection ~ 1–2%.
  • Testicular complications: ischemic orchitis < 1%, testicular atrophy < 0.5%.
  • Nerve injury: ilioinguinal (open), lateral femoral cutaneous (lap/robotic).
  • Urinary retention ~ 2–5%, more common in older men and with spinal anesthesia.
• Benefits:
  • Durable defect closure, relief of symptoms, prevention of incarceration/strangulation.
• Alternatives:
  • Watchful waiting (in asymptomatic or minimally symptomatic men).
  • Truss (historical; not recommended).

---

Post-Op Considerations

• Disposition: Same-day discharge for most.
• Diet / activity: Regular diet as tolerated. Ambulate same day. No heavy lifting (> 15–20 lb) or core-heavy activity for 2–4 weeks; longer (6 weeks) for heavy laborers with open mesh repair.
• Pain control: Multimodal (acetaminophen + NSAID scheduled, short opioid course). Local infiltration at closure reduces opioid use.
• Monitor for:
  • Urinary retention on POD 0–1.
  • Scrotal hematoma / swelling — usually self-limited.
  • Wound infection at 5–10 days.
  • Mesh infection (rare, late) — usually requires explantation.
• Follow-up: Wound check at 2 weeks; return to work at 1–2 weeks for office jobs, 4–6 weeks for physical labor.

---

Clinical Pearls

• Open vs lap for bilateral or recurrent hernias: laparoscopic/robotic is strongly preferred. Virgin preperitoneal planes and a single anesthetic for bilateral.
• Open for incarcerated/strangulated hernias: lower threshold to go open — tissue planes are inflamed and bowel assessment is easier.
• Reducible but tender hernia in the ED: try gentle taxis with sedation and Trendelenburg; if it reduces, semi-elective repair. If not, to OR.
• Femoral hernias should be repaired when found regardless of symptoms — up to 40% present with incarceration or strangulation.
• Women have a disproportionately higher rate of femoral hernias (~20% vs <5% in men); always look for a femoral component.
• Recurrent hernia after anterior open repair: go posterior (lap/robotic TAPP/TEP). Recurrent after posterior: go anterior.
• Mesh choice: heavier-weight polypropylene for standard Lichtenstein; lightweight, large-pore mesh increasingly preferred for lower chronic pain rates with equivalent recurrence.
• Chronic pain workup after repair: imaging (US/MRI) to rule out recurrence, consider nerve blocks, and if refractory consider triple neurectomy (ilioinguinal + iliohypogastric + genital branch of genitofemoral).

---

Quick Reference Table

---

Quick-Reference Cards

---

Related Topic Reviews

• Hernias — anatomy, eponymous hernias, mesh placement, and the rest of the abdominal wall.

Related Landmark Papers

• STITCH — fascial closure technique (relevant for mesh exposure incision closures and any midline working ports).

---

References

1. Fitzgibbons RJ Jr, Giobbie-Hurder A, Gibbs JO, et al. Watchful waiting vs repair of inguinal hernia in minimally symptomatic men: a randomized clinical trial. JAMA. 2006; 295(3): 285–292.
2. Köckerling F, Simons MP. Current concepts of inguinal hernia repair. Visc Med. 2018; 34(2): 145–150. PMID 29888245.
3. Alfieri S, Amid PK, Campanelli G, et al. International guidelines for prevention and management of post-operative chronic pain following inguinal hernia surgery. Hernia. 2011; 15(3): 239–249.
4. Aiolfi A, Cavalli M, Del Ferraro S, et al. Robotic vs laparoscopic vs open inguinal hernia repair: network meta-analysis. Hernia. 2021; 25(5): 1147–1157.
5. HerniaSurge Group. International guidelines for groin hernia management. Hernia. 2018; 22(1): 1–165.