The Kocher Manoeuvre
Executive Summary
The Kocher manœuvre is a fundamental surgical technique used to mobilize the duodenum and the head of the pancreas. Originally developed by Theodor Kocher in the late 19th and early 20th centuries to facilitate safe gastro-duodenal unions, the procedure has evolved into a critical prelude for a wide array of upper abdominal operations.
The technique relies on the anatomical principle of "detension"—rendering fixed organs mobile by exploiting avascular planes formed during embryonic development. Specifically, it involves incising the paraduodenal peritoneum and cleaving the gossamer-fine, avascular "cribriform fascia" to separate the duodenum and pancreas from the retroperitoneal structures, such as the vena cava and aorta.
Proper execution of the manœuvre is essential for adequate exposure of the biliary tree and pancreas. Failure to perform it when indicated significantly increases the risk of post-operative complications, including anastomotic leakage due to tension, and diagnostic failures, such as missed calculi in the common bile duct or undetected pancreatic abnormalities.
Historical and Conceptual Foundations
The eponymous manœuvre is named after Theodor Kocher of Bern, who published the technique approximately 32 years after his appointment to the Chair of Surgery. While Kocher’s primary objective was to ensure a safe union between the stomach and duodenum, the technique's utility has since expanded.
Timeline of Development:
1891: Kocher performed an end-to-side anastomosis of the duodenum to the posterior gastric wall.
1903: Kocher published "Mobilization of the duodenum," advocating for a peritoneal incision 3–4 cm from the duodenal edge.
1930: D.P.M. Wilkie introduced the principle of "detension," arguing that abdominal organs fixed in adulthood were mobile during development and could be rendered so again through strategic dissection rather than force.
Modern Context: The term "Kocher manœuvre" is now firmly entrenched in surgical parlance, serving as a standard step in procedures ranging from portocaval shunts to pancreaticoduodenectomies.
Anatomical Considerations
Successful mobilization depends on understanding the duodenum’s retreat to the retroperitoneal plane during development.
Structural Rotation
As the duodenum moves to its right-sided location, it rotates so that:
Its original right aspect becomes posterior.
Its mesenteric aspect becomes medial (acting as a hilum for bile and pancreatic ducts).
Its original antimesenteric face becomes lateral.
The Avascular Plane
The posterior aspects of both the pancreas and the duodenum are attached only by a loose, "gossamer-fine" avascular tissue known as the cribriform fascia. This fascia provides the ideal plane for cleavage, as it allows the surgeon to separate the organs from the underlying renal fascia, vena cava, and aorta without significant blood loss.
Surgical Technique
The manœuvre is described as an easily performed and safe technique when the correct anatomical planes are respected.
Preparation and Access
Positioning: While the surgeon can stand on either side, standing on the patient’s left is considered more convenient.
Retraction:
The assistant retracts the hepatic flexure of the colon downwards.
The assistant retracts the right lobe of the liver upwards using a flat retractor.
Incision: The surgeon rolls the descending duodenum medially with the left hand to stretch the paraduodenal peritoneum. A precise incision is made with a knife or scissors approximately three centimetres lateral to the edge of the duodenum, near its mid-point.
Dissection
Exposure: The incision exposes the cobweb-like cribriform fascia.
Cleavage: The surgeon uses finger tips to separate the fascia.
Exploration: The left hand is inserted into the retroduodenal space and pushed toward the mid-line, behind the duodenum and pancreas but in front of the vena cava and aorta.
The "Guys" (Fascial Attachments)
Specific extensions of the mobilization require the division of condensed fascia, referred to as "guys":
Superior Guy: Divided to open the lesser sac and provide complete exposure of the retro-pancreatic common bile duct, celiac axis, and celiac ganglia.
Middle Guy: Divided for simple palpation of the pancreatic head or duodenotomy.
Inferior Guy: Located at the angle between the second and third parts of the duodenum; must be divided to "dislocate" the duodenum for tension-free anastomosis to the stomach or esophagus.
Clinical Applications
Mobilization is considered essential or highly advantageous in several surgical scenarios:
Risks and Surgical Errors
Precision in the initial peritoneal incision is critical to avoid complications.
Potential Errors in Execution
Incision Too Medial: Risk of entering the vascular posterior pancreaticoduodenal sulcus, resulting in brisk venous hemorrhage.
Incision Too Lateral: Risk of dividing the adherent renal fascia. This creates a barrier that prevents the surgeon's hand from finding the correct retroduodenal plane.
Incision Too Superficial: May also lead to entry into the vascular sulcus and subsequent bleeding.
Consequence of Omission
Failure to perform the Kocher manœuvre when necessary can lead to significant clinical failures:
Anastomotic Leakage: Caused by excessive tension on duodenotomy, gastro-duodenal, or gastro-esophageal sites.
Diagnostic Failure: Inability to palpate calculi (stones) in the distal common bile duct.
Missed Pathology: Failure to detect abnormalities in the head of the pancreas, such as a duodenal diverticulum.
Complications
The only specifically reported complication following the manœuvre is the reversal of the duodenal loop. This is described as "excessively rare" and typically only occurs if the inferior guy has been divided. Hematomas in the raw area are also rare, provided the operator maintains the correct avascular plane and avoids abnormal veins associated with portal hypertension.
