Hernia Repair: Modern Techniques with Step-by-Step Procedures

Overview of Techniques

1. Open Anterior Repair - Lichtenstein "Tension-Free" Repair

Step-by-Step

• Make an oblique incision ~6-8 cm, inferior and medial to the anterior superior iliac spine, ending just lateral to the symphysis pubis.
• Carry dissection down through subcutaneous fat to the aponeurosis of the external oblique muscle. Ligate/cauterize the superficial epigastric veins.

• Open the external oblique aponeurosis along the direction of its fibers using Metzenbaum scissors, extending through the external inguinal ring medially.
• Identify and preserve the ilioinguinal nerve running through the inguinal canal. Identify the iliohypogastric nerve by elevating the external oblique superiorly.

• Isolate the spermatic cord (with any indirect hernia sac) using a Penrose drain for retraction.
• The indirect sac lies on the anterolateral cord surface. Separate it from adjacent cord structures - divide surrounding cremaster fibers carefully.
• Identify and preserve the genital branch of the genitofemoral nerve within the deep spermatic cord.
• For an indirect sac: dissect to the internal ring, reduce/excise the sac, ligate at the ring. For a direct sac: reduce the bulge, do not excise; imbricate the transversalis fascia if bulky.

• Carefully assess for any defect in Hesselbach's triangle (a direct hernia) and at the femoral canal.
• Place interrupted monofilament sutures to close any transversalis fascial defects.

• Cut a flat polypropylene mesh (~7 × 15 cm) to fit the inguinal floor. Create a tail with a slit to accommodate the cord.
• Suture the medial end to the pubic tubercle periosteum with a non-absorbable suture, continuing along the inguinal ligament (inferiorly) to the internal ring.
• Suture the mesh superiorly to the internal oblique aponeurosis/muscle.
• The two tails are crossed around the cord and sutured together lateral to the ring to recreate the deep ring.

• Close the external oblique aponeurosis over the mesh with continuous absorbable suture.
• Close Scarpa's fascia, then skin.

- Current Surgical Therapy 14e, p. 706-710; Bailey and Love's Short Practice of Surgery 28th Edition

2. Pure Tissue Repair - Shouldice Technique

Step-by-Step

• Divide the transversalis fascia from the internal ring to the pubic tubercle, creating two flaps.

• Layer 1: The deep flap of transversalis is sutured to the under-surface of the superior flap (Poupart's ligament region). Run a monofilament non-absorbable suture continuously.
• Layer 2: Return suture - the superficial flap to the shelving edge of the inguinal ligament.
• Layer 3: Internal oblique muscle/aponeurosis sutured to inguinal ligament.
• Layer 4: Return of Layer 3 suture.
• This four-layer running suture technique is the Shouldice hallmark - it distributes tension across multiple tissue planes.

- Current Surgical Therapy 14e; Bailey and Love's 28th Edition

3. Laparoscopic Hernia Repair - TAPP and TEP

• Reduced immediate and long-term pain (up to 5 years)
• More rapid return to activity
• Fewer wound complications
• Particular benefit for bilateral hernias and recurrence after open repair

3A. Totally Extraperitoneal (TEP) Repair

Step-by-Step

• Make a 1.5-2 cm infraumbilical incision. Incise the anterior rectus sheath and retract the rectus muscle laterally.
• Insert a balloon dissector trocar into the extraperitoneal (preperitoneal) space.

• Inflate the balloon under direct vision to develop the preperitoneal space (the "space of Retzius" and space of Bogros). This is the key distinguishing step of TEP.
• Insufflate CO2 to ~12 mmHg to maintain the preperitoneal space.
• Place two additional 5 mm trocars in the midline (suprapubic region) under direct vision.

• Identify: pubic tubercle/symphysis, Cooper's ligament, inferior epigastric vessels, iliopubic tract, vas deferens, gonadal vessels, and the hernia defect(s).

• For indirect hernia: gently separate the sac from cord structures. Small sacs are reduced; large scrotal sacs may be divided and left in situ to avoid cord injury.
• For direct hernia: reduce the pseudosac (preperitoneal fat/transversalis fascia invagination) back through the defect.

• Roll a 15 × 10 cm polypropylene mesh and insert through the umbilical port.
• Unroll to cover Hesselbach's triangle, the deep inguinal ring, and femoral space with overlap.
• Mesh should extend 2 cm medial to the pubic tubercle, 3-4 cm above the Hesselbach triangle, and 5-6 cm lateral to the internal ring.
• In TEP, fixation is often not required - the preperitoneal pressure holds the mesh in place.

• Carefully desufflate under vision to ensure mesh does not curl. The natural abdominal wall pressure holds the mesh in position.
• Close the rectus sheath. Close skin.

- Bailey and Love's 28th Edition, p. 1091-1092; Campbell-Walsh-Wein Urology

3B. Transabdominal Preperitoneal (TAPP) Repair

Step-by-Step

• Establish pneumoperitoneum (CO2, 12-14 mmHg). Enter via umbilical Veress needle or Hassan technique.
• Camera port at umbilicus (10-12 mm), two 5 mm working ports lateral and inferior.
• Place patient in Trendelenburg (head-down) position.

• Inspect both inguinal regions. Note the inferior epigastric vessels, medial umbilical ligament, vas deferens, and gonadal vessels. Identify the hernia defect(s): indirect (lateral to inferior epigastric vessels), direct (medial), or femoral.

• Make a semicircular peritoneal incision ~3-4 cm above the hernia defect(s), running from the medial umbilical ligament to the anterior superior iliac spine (ASIS). This is the critical step unique to TAPP.
• Develop peritoneal flaps cranially and caudally.

• Develop the preperitoneal space (space of Retzius medially, space of Bogros laterally).
• Identify Cooper's ligament, pubic tubercle, iliopubic tract, and the "triangle of doom" (between vas deferens and gonadal vessels - contains external iliac vessels - must not be stapled).
• Identify the "triangle of pain" (lateral to gonadal vessels - contains the lateral femoral cutaneous nerve and genitofemoral nerve - avoid tacks here).

• Reduce the hernia sac from the preperitoneal space. For large indirect sacs, divide and leave the distal sac to prevent cord injury.

• Roll a 15 × 10 cm (minimum) mesh. Insert via the 10-12 mm port.
• Position to cover all potential defect sites with adequate overlap.
• Fixation options: tacker (non-penetrating > penetrating to reduce nerve risk), fibrin glue, or no fixation for small defects.

• Close the peritoneal flap over the mesh using tacking or running suture - this is essential to avoid mesh contact with bowel (risk of adhesion/fistula).
• Desufflate, close ports.

- Bailey and Love's Short Practice of Surgery 28th Edition, p. 1091-1092; Frontiers in Surgery 2024

4. Robotic Hernia Repair (Most Recent Technique)

Key Advantages Over Laparoscopic

• Wristed instruments allow easier fascial defect closure and suturing
• Superior 3D visualization and tremor filtering
• Better ergonomics for complex dissection
• Single-port option (da Vinci SP) now available

Robotic Inguinal Hernia Repair (r-TAPP) - Step-by-Step

• Supine position, Trendelenburg.
• Port placement mirrors TAPP but must account for robotic arm collision: 8.5 mm camera port at umbilicus, two 8 mm robotic arm ports placed more lateral than traditional TAPP.
• The robot is docked from between the patient's legs or from the side.

• Enter peritoneal cavity. The robotic camera gives a 10× magnified, 3D view.

• Using robotic scissors/monopolar cautery, create the peritoneal flap exactly as in TAPP (3-4 cm above defect, ASIS to medial umbilical ligament).
• Robotic dexterity makes this incision more precise, especially in obese patients.

• Identify Cooper's ligament, epigastric vessels, vas deferens, gonadal vessels using the high-definition 3D robotic camera. All anatomical triangles (danger zones) are identified.

• The articulating robotic wrists allow easier rolling and deployment of the mesh.
• Suture fixation to Cooper's ligament is possible robotically (not easy laparoscopically) - this is thought to contribute to lower recurrence rates in the RVHR at 2 years.

• Robotic running suture closure of peritoneum is significantly easier than laparoscopic - this is a key technical advantage of the robotic approach.

• RIVAL Trial (2020): Robotic vs. laparoscopic - no difference in clinical outcomes; robotic had longer operative time and higher cost. No benefit for straightforward inguinal hernias.
• Prospective Hernia Study: Robotic required less pain medication than laparoscopic (P=0.013) and open (P<0.001); faster functional recovery.
• 2025 Meta-analysis (PMID 41384988): Robotic TAPP vs laparoscopic TAPP - similar short-term outcomes.
• Single-port robotic (da Vinci SP, 2023 study): Shorter operative time (78.1 vs 93.2 min, P=0.003) and faster recovery vs multiport.

- Sabiston Textbook of Surgery, p. 163-165

5. Robotic Ventral Hernia Repair (RVHR)

Step-by-Step

6. Mesh Technology

• Synthetic (most common): Polypropylene, polyester, PTFE. Polypropylene is inert, hydrophobic, and resists infection. Polyester encourages microvascular ingrowth.
• Biologic: Derived from decellularized animal/human tissue - for contaminated fields.
• Composite: Anti-adhesive barrier layer on one face (for intraperitoneal placement).

Mesh plug repairs have been largely abandoned due to "meshoma" formation (fibrous mass) causing chronic pain, and risks of mesh migration and erosion. - Bailey and Love's 28th Edition, p. 1084

Choosing the Right Approach

Recent Evidence Summary (2024-2025)

Complications to Watch For

• Chronic post-herniorrhaphy pain (most common complication, 11-18%): Risk is higher with open approaches. Prevention requires identification and preservation of the ilioinguinal, iliohypogastric, and genital branch of the genitofemoral nerves. Preserving all three reduces chronic pain to <1%.
• Recurrence: Mesh reduces recurrence vs tissue repair (3-fold higher recurrence with Shouldice vs Lichtenstein). Higher risk with smoking, obesity, and poor surgical technique.
• Seroma: More common after laparoscopic repair of large indirect sacs.
• Vascular/nerve injury in laparoscopic: Avoid the triangle of doom (external iliac vessels) and triangle of pain (lateral cutaneous/genitofemoral nerves).

Sources: Current Surgical Therapy 14e, p. 708-710; Sabiston Textbook of Surgery; Bailey and Love's Short Practice of Surgery 28th Edition