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Inguinal Hernia Management - High Yield

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1. Anatomy Quick Review

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2. Clinical Examination

• Invaginated finger test: Finger introduced via scrotum into inguinal canal
  • Cough impulse felt at tip of finger = indirect hernia
  • Cough impulse felt at pulp/side of finger = direct hernia
• Zieman's technique (three-finger test): Examiner's index finger over deep ring (indirect), middle finger over Hesselbach's triangle (direct), ring finger over femoral canal (femoral)
• Occlusion test: Pressure over deep ring controls indirect hernia but not direct hernia

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3. Classification - Nyhus System (High-Yield for Exams)

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4. Indications for Surgery

• All inguinal hernias in children - surgical repair is mandatory (no spontaneous resolution)
• Adults:
  • Symptomatic hernias: elective repair recommended
  • Watchful waiting is acceptable for asymptomatic or minimally symptomatic hernias in males (low risk of acute incarceration ~0.2%/year)
  • Emergency repair: incarceration, strangulation, obstruction

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5. Surgical Repair - Open Techniques

A. Tissue (Non-Mesh) Repairs

• Contaminated field (strangulation with bowel resection, mesh infection risk)
• Pediatric repair (high ligation of sac only, no floor repair needed)
• Patient preference / mesh contraindication

B. Open Mesh Repair

• Polypropylene mesh placed over posterior wall of inguinal canal
• Fixed to pubic tubercle medially, inguinal ligament inferiorly, internal oblique superiorly
• Keyhole slit cut for spermatic cord
• Recurrence rate ~0.5-1%
• Identifies and preserves ilioinguinal, iliohypogastric, and genital branch of genitofemoral nerves

• Plug and patch (Rutkow-Robbins): Mesh plug into defect + flat mesh overlay
• PHS (Prolene Hernia System): Bilayer device, pre-peritoneal and flat onlay components

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6. Laparoscopic / Minimally Invasive Repair

• Laparoscopic = less post-op pain, faster return to work, better for bilateral/recurrent hernias
• Open Lichtenstein = simpler, lower cost, lower learning curve
• Recurrence rates are equivalent when performed by experienced surgeons
• Chronic pain is higher with open approach
• TAPP vs TEP (Cochrane 2024, PMID 38963034): No significant difference in outcomes; choice based on surgeon experience and patient factors

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7. Special Situations

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8. Nerve Anatomy (Critical to Avoid Chronic Pain)

1. Ilioinguinal nerve - travels within inguinal canal on anterior surface of cord
2. Iliohypogastric nerve - runs along internal oblique above the canal
3. Genital branch of genitofemoral nerve - travels within deep spermatic cord

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9. Complications

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10. Key Differentiators (Exam Focus)

• Direct hernia = always acquired, never congenital, Hesselbach's triangle, elderly, medial to inferior epigastric vessels, broad base = low strangulation risk
• Indirect hernia = congenital or acquired, through deep ring lateral to inferior epigastric vessels, can descend to scrotum, all pediatric hernias are indirect
• Lichtenstein = gold standard open repair (mesh, tension-free)
• Shouldice = gold standard tissue repair (4-layer, specialized centers)
• Laparoscopic TEP = no peritoneal entry (true extra-peritoneal); TAPP = enters peritoneum then goes pre-peritoneal
• Recurrent after open anterior = use posterior (laparoscopic) approach and vice versa

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• Bailey & Love's Short Practice of Surgery, 28th Edition
• Current Surgical Therapy, 14th Edition
• Schwartz's Principles of Surgery, 11th Edition
• Cochrane review: TAPP vs TEP (PMID 38963034), 2024

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What's inside (7 slides, dark navy theme):

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SURGICAL APPROACHES FOR INGUINAL HERNIA

Direct & Indirect — Core Procedure Steps

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MASTER DECISION FLOWCHART

                    ┌─────────────────────────┐
                    │  INGUINAL HERNIA         │
                    │  DIAGNOSED               │
                    └────────────┬────────────┘
                                 │
                    ┌────────────▼────────────┐
                    │  Acute presentation?    │
                    │  (Incarcerated /        │◄── YES ──► Attempt Manual Reduction
                    │   Strangulated?)        │                    │
                    └────────────┬────────────┘         ┌─────────┴────────┐
                                 │ NO                   YES                NO
                                 │                       │                  │
                    ┌────────────▼────────────┐    Elective repair    EMERGENCY
                    │    Symptomatic?         │    within 24–48 h     SURGERY
                    └────────────┬────────────┘                       ± bowel
                          │             │                              resection
                         YES            NO                            → Tissue
                          │             │                              repair
                          │      Watchful Waiting                     (no mesh)
                          │      (acceptable in
                          │       asymptomatic males)
                          │
           ┌──────────────┴──────────────┐
           │                             │
          OPEN                    LAPAROSCOPIC /
           │                          ROBOTIC
           │                             │
    ┌──────┴──────┐             ┌────────┼────────┐
   Mesh CI?     Mesh OK        TAPP     TEP    Robotic
    │              │                              TAPP
    ▼              ▼
TISSUE         LICHTENSTEIN
REPAIR         (Tension-Free)
(Shouldice /   Alt: Plug & Patch
 Bassini /          PHS
 McVay)

• Bilateral hernia → Laparoscopic (TEP/TAPP) preferred
• Recurrent after open anterior → Laparoscopic posterior
• Recurrent after laparoscopic → Open anterior
• Contaminated field → Tissue repair (no mesh)
• Pediatric → High ligation of sac only

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A. LICHTENSTEIN TENSION-FREE REPAIR

STEP 1
Incision: 6–8 cm oblique, below ASIS → just lateral to symphysis pubis
         │
         ▼
STEP 2
Divide Scarpa's fascia
Ligate/cauterize superficial epigastric veins
         │
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STEP 3
Open external oblique aponeurosis along fiber direction
→ Incision extended through external inguinal ring medially
→ Exposes inguinal canal
         │
         ▼
STEP 4
Identify & PRESERVE all 3 nerves:
  • Ilioinguinal nerve (anterior surface of cord)
  • Iliohypogastric nerve (along internal oblique above canal)
  • Genital branch of genitofemoral nerve (within deep cord)
         │
         ▼
STEP 5
Bluntly dissect internal oblique from overlying external oblique flap
Reveal shelving edge of inguinal ligament
         │
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STEP 6
Isolate spermatic cord with Penrose drain
         │
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STEP 7
Dissect INDIRECT sac from cord anterolateral surface
Separate from cremasteric fibers
→ Reduce or ligate at deep ring
         │
         ▼
STEP 8
Assess posterior wall for DIRECT hernia defect
(broad weakness of Hesselbach's triangle)
         │
         ▼
STEP 9
Cut polypropylene mesh ~15×7 cm
Round the medial end to fit medial canal corner
         │
         ▼
STEP 10
Fix medial edge: single suture to aponeurotic tissue overlying
pubic tubercle, ~2 cm medial overlap
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         ▼
STEP 11
Running suture (baseball stitch):
Inferior mesh edge → inguinal ligament (medial to lateral)
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STEP 12
Interrupted sutures:
Superior mesh edge → internal oblique aponeurosis
(avoid iliohypogastric nerve)
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         ▼
STEP 13
Slit lateral mesh → create 2 tails:
  • Wide tail (2/3 width) — superior
  • Narrow tail (1/3 width) — inferior
Encircle cord between tails
→ Shutter valve stitch at inguinal ligament lateral to cord
→ Tuck tails under ext oblique to ASIS level
         │
         ▼
STEP 14
Close external oblique aponeurosis
→ Recreate external ring
→ Subcuticular skin closure

Note: For direct hernia - posterior wall weakness does NOT require separate repair; mesh covers and reinforces Hesselbach's triangle automatically.

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B. SHOULDICE REPAIR

STEP 1
Incision → Scarpa's fascia → open external oblique aponeurosis
→ Isolate spermatic cord (identical to Lichtenstein up to this point)
         │
         ▼
STEP 2
Dissect indirect sac from cord → reduce → high ligation at deep ring
         │
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STEP 3
Divide transversalis fascia from pubic tubercle → to deep inguinal ring
→ Develop preperitoneal space
→ Reduce any direct protrusion / lipoma
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STEP 4  ── LAYER 1 ──
Running suture starts at pubic tubercle
Deep flap of transversalis fascia sutured to
undersurface of superior flap  (medial → lateral)
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         ▼
STEP 5  ── LAYER 2 ──
Same suture returns (lateral → medial)
Superior flap approximated to inguinal ligament
(Suture tied back at pubic tubercle)
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STEP 6  ── LAYER 3 ──
New suture: internal oblique / conjoined tendon
approximated to inguinal ligament  (medial → lateral)
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STEP 7  ── LAYER 4 ──
Same suture returns (lateral → medial)
External oblique aponeurosis edges approximated over cord
         │
         ▼
STEP 8
Reconstruct external ring
→ Layer closure → Skin

Memory: 4 layers = 2 sutures, each folding back — transversalis fascia (deep, then returned) + internal oblique/ext oblique (then returned).

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C. BASSINI REPAIR

STEP 1
Incision → open external oblique aponeurosis
→ Expose inguinal canal
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         ▼
STEP 2
Isolate cord
→ Dissect & reduce indirect sac
→ High ligation at internal ring
         │
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STEP 3
Assess posterior wall for direct defect
         │
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STEP 4
Triple-layer reconstruction:
Conjoined tendon (transversus abdominis + internal oblique)
sutured POSTERIOR to cord to inguinal ligament
→ Interrupted non-absorbable sutures
         │
         ▼
STEP 5
Reconstruct external ring
→ Layer closure → Skin

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D. McVAY (COOPER'S LIGAMENT) REPAIR

STEP 1
Standard inguinal dissection
→ Open inguinal floor down to Cooper's (pectineal) ligament
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STEP 2
Suture conjoined tendon → Cooper's ligament (medially)
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STEP 3
Transition stitch: sutures shift from Cooper's ligament
→ inguinal ligament laterally, passing OVER femoral vessels
(this closes the femoral canal)
         │
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STEP 4
Relaxing incision in anterior rectus sheath
(relieves tension on repair)
→ Close in layers

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E. LAPAROSCOPIC TAPP

STEP 1
Position: Trendelenburg, tilted to contralateral side
(gravity moves bowel cephalad)
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         ▼
STEP 2
Port placement:
  • 10–12 mm umbilical camera port
  • Two 5 mm working ports (~6 cm lateral to umbilicus)
  Bilateral: both ports at umbilical level
  Unilateral: ipsilateral port higher, contralateral lower
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STEP 3
Enter peritoneal cavity
→ Visual inspection of both inguinal regions
→ Confirm hernia type and bilaterality
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STEP 4
Incise peritoneum ≥4 cm above internal ring
(from lateral to ASIS → medial umbilical ligament)
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STEP 5
Develop preperitoneal space in AVASCULAR plane
just deep to transversalis fascia
         │
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STEP 6
MEDIAL dissection:
→ Parietal transversalis fascia layer
→ Expose retropubic (space of Retzius)
→ Identify Cooper's ligament, pubic symphysis
         │
         ▼
STEP 7
LATERAL dissection:
→ Preserve visceral/parietal fascia over nerve area
→ Avoid Triangle of Pain and Triangle of Doom (see below)
         │
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STEP 8
Reduce hernia sac completely into abdomen
(Indirect: separate from cord; divide if cannot fully reduce)
(Direct: reduce preperitoneal fat, invert pseudosac)
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STEP 9
Place large polypropylene mesh (≥15×10 cm)
→ Must cover entire MYOPECTINEAL ORIFICE (MPO):
  deep ring + direct space + femoral canal
         │
         ▼
STEP 10
Fix mesh:
  • Tacks to Cooper's ligament (medially)
  • Tacks ABOVE iliopubic tract (laterally)
  ⚠ NO tacks below iliopubic tract (nerve injury)
  ⚠ NO tacks in Triangle of Doom (vascular injury)
         │
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STEP 11
Close peritoneum COMPLETELY over mesh
(running suture or tacker)
→ Prevents mesh-bowel adhesions
         │
         ▼
STEP 12
Deflate pneumoperitoneum
→ Close port sites ≥10 mm
→ Skin closure

• Triangle of Doom (between vas deferens and gonadal vessels): external iliac artery & vein — no tacks
• Triangle of Pain (lateral to gonadal vessels, below iliopubic tract): lateral cutaneous nerve of thigh + femoral branch of genitofemoral nerve — no tacks

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F. LAPAROSCOPIC TEP

STEP 1
Infraumbilical incision
→ Open anterior rectus sheath
→ DO NOT enter peritoneal cavity
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STEP 2
Insert 10–12 mm blunt trocar into preperitoneal space
(beneath rectus abdominis, anterior to posterior sheath)
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STEP 3
Balloon dissector / blunt laparoscope expansion
→ Creates working space in preperitoneal plane
→ Under direct vision to avoid peritoneal breach
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STEP 4
Place 2 additional 5 mm trocars in midline
(infraumbilical + suprapubic)
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STEP 5
CO₂ insufflation of preperitoneal space
(~8–12 mmHg)
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STEP 6
Identify anatomical landmarks:
  • Pubic symphysis
  • Cooper's ligament
  • Inferior epigastric vessels
  • Vas deferens
  • Iliac vessels
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STEP 7
Dissect direct and/or indirect sac
→ Reduce completely into abdomen
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STEP 8
Ligate large indirect sac at deep ring if needed
(Cream-pot rule: reduce contents before dividing)
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STEP 9
Place large mesh (≥15×10 cm)
→ Covers entire MPO (deep ring + direct space + femoral canal)
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STEP 10
Fix mesh:
  • Cooper's ligament medially
  • Above iliopubic tract laterally
  ⚠ Same danger zones as TAPP apply
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STEP 11
NO peritoneal closure needed
(key advantage over TAPP)
         │
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STEP 12
Deflate CO₂ GRADUALLY
(allows mesh to lie flat against abdominal wall)
→ Close anterior rectus sheath → Skin

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G. EMERGENCY REPAIR (Strangulated / Irreducible)

STEP 1
Resuscitate: IV fluids, NGT, Foley catheter, antibiotics
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STEP 2
Incision: Inguinal approach ± extend to laparotomy if needed
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STEP 3
Open hernial sac; assess bowel viability
  ├── Viable bowel → reduce into abdomen
  └── Non-viable → resect + primary anastomosis or stoma
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STEP 4
Repair hernia defect:
  CONTAMINATED / bowel resection → TISSUE REPAIR (no mesh)
  CLEAN field → Mesh acceptable
         │
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STEP 5
Close in layers; consider drain if contaminated

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HEAD-TO-HEAD COMPARISON

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QUICK REFERENCE — SPECIAL SITUATIONS

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