Port Site Closure Methods and Hernia Prevention
Executive Summary
Port site hernias (PSH) represent a significant iatrogenic complication of laparoscopic surgery, with an average incidence of approximately 1%. While occurring in only a small percentage of cases, the associated morbidity—including small bowel obstruction and the potential necessity for bowel resection—can negate the benefits of minimally invasive procedures. Most PSH (>90%) occur at trocar sites of 10 mm or larger, particularly in the umbilical and midline regions.
Prevention is predicated on meticulous fascial and peritoneal closure. While various techniques exist, ranging from standard open closure to advanced laparoscopic-assisted methods using specialized suture passers or angiocatheters, the primary goal remains the secure approximation of all layers of the abdominal wall. Adhering to technical best practices—such as minimizing port size, avoiding excessive torque on ports, and ensuring controlled desufflation—is essential to reducing the incidence of these hernias.
Pathophysiology and Risk Factors
The first case of a laparoscopic port site hernia was documented in 1968. Since then, the evolution of complex laparoscopic procedures requiring more and larger ports has sustained the relevance of this complication.
Anatomical and Technical Factors
Location Sensitivity: PSH are most frequent at umbilical and midline sites. This is attributed to the inherent thinness of the umbilical skin and weaknesses in the linea alba. Conversely, lateral sites have a lower incidence due to the protection offered by overlapping muscle and fascial layers.
Port Size: Although hernias have been reported at sites as small as 5 mm, over 90% are associated with trocar sites of 10 mm or larger.
Closure Status: While fascial closure does not offer a 100% guarantee against herniation, the incidence of PSH is significantly higher when closure is not attempted.
Patient and Comorbid Factors
Several patient-specific factors increase the likelihood of developing a PSH:
Obesity: The thickness of the subcutaneous fat layer can make adequate fascial closure technically difficult.
Comorbidities: Diabetes mellitus and wound infections are known to increase risk.
Preexisting Defects: Undetected umbilical hernias near a port site can lead to PSH if both defects are not formally repaired together.
Clinical Presentation and Diagnosis
Patients typically present within two weeks of surgery, though PSH can manifest years later. Clinical suspicion should remain high for any patient presenting with bowel obstruction up to one year post-laparoscopy.
Symptomatology: Symptoms range from asymptomatic cases to intense pain, fever, or gastrointestinal distress. Pain may result from omental infarction or small bowel obstruction.
Hernia Contents: The small bowel and omentum are the most common contents; the large bowel is involved only on rare occasions.
Richter’s Hernia: Due to the small size of fascial defects, Richter’s hernias—where only a portion of the bowel wall is trapped—are common and particularly dangerous because their insidious nature can delay diagnosis and lead to high morbidity.
Diagnostic Tools: A computed tomography (CT) scan is the most helpful imaging modality for confirming a diagnosis.
Port Site Closure Techniques
The ideal closure method is fast, safe, inexpensive, and provides adequate closure of both the fascia and peritoneum without requiring an enlargement of the skin incision.
Standard Open Closure
This method involves direct visualization of the defect through the skin wound after the port is removed and the abdomen is desufflated.
Procedure: Fascial edges are grasped with Kocher or Allis clamps and sutured (simple or figure-of-eight).
Limitations: It is technically challenging in patients with high BMIs. The surgeon may need to enlarge the skin incision to ensure all fascial layers are included, prioritizing surgical integrity over cosmetic results.
Laparoscopic Direct Visualization Methods
These techniques allow for suture placement while the pneumoperitoneum is still intact, using the laparoscope to monitor the needle's passage.
Advantages: More accurate suture placement, potential reduction in operative time, and elimination of the need to extend skin incisions.
Tools: Specific devices include the Grice method, Carter-Thomson Needle-Point suture passer, Maciol suture needle, and Endoclose suture carrier.
General Process: A suture-bearing instrument is inserted through the abdominal wall at a 30°–45° angle. An internal grasper holds the suture while the passer is withdrawn and re-inserted on the opposite side (180°) of the defect to retrieve the suture end.
Angiocatheter Technique
This is an inexpensive alternative (approximate cost: $3) utilizing a standard 14-gauge angiocatheter.
Procedure: The catheter is inserted 30° away from the trocar. A pre-tied loop of suture is passed through the cannula into the abdomen. A second suture is passed through an angiocatheter on the opposite side and threaded through the loop. The loop is then withdrawn, pulling the second suture with it to be tied subcutaneously.
Note: For obese patients, longer 16- or 18-gauge spinal needles may be used if a standard angiocatheter is too short.
Prevention Strategies and Recommendations
The associated morbidity of PSH, which requires repair via laparotomy or repeat laparoscopy and results in bowel resection in up to 10% of cases, necessitates a proactive approach to prevention.
Core Recommendations for Closure
Mandatory Closure: All ports 10 mm or larger (midline and lateral) must be closed at the fascial level.
Layer Integrity: Both the fascia and the peritoneum should be included in the closure.
Small Port Exceptions: 5-mm ports should be closed if they were extensively manipulated or if the port is located in the midline.
Visual Confirmation: Whenever possible, the abdominal side of the wound should be viewed via laparoscope during closure.
Surgical Best Practices
Conclusion
Proper closure of port sites is a fundamental requirement of laparoscopic surgery. Failure to ensure fascial and peritoneal integrity can lead to significant iatrogenic injury, requiring complex secondary interventions and undermining the efficacy of the original surgical procedure.
