Ladd's Procedure (Malrotation)

Intestinal malrotation results from failure of normal embryologic rotation of the midgut during the 6th–10th week of gestation. The normal sequence brings the duodenojejunal junction to the left of the spine and the cecum to the right lower quadrant, anchored by a broad mesentery. In malrotation, this rotation is incomplete: the duodenojejunal junction lies to the right of the spine and the cecum lies in the right upper quadrant or midline, with the entire small bowel suspended on a narrow mesenteric pedicle.

Two consequences follow. First, abnormal peritoneal bands (Ladd's bands) cross from the malpositioned cecum across the duodenum to attach to the right lateral abdominal wall, obstructing the duodenum. Second, the narrow mesenteric pedicle predisposes to midgut volvulus — clockwise torsion of the entire small bowel and right colon around the superior mesenteric artery, with rapid ischemia.

Most malrotation presents in infancy with bilious emesis, which in a young child is malrotation with volvulus until proven otherwise. Older children and adults may be asymptomatic or present with intermittent abdominal pain, vomiting, or failure to thrive. Bilious emesis in an infant requires emergent evaluation.

Upper GI contrast study is the diagnostic test of choice. Findings include a duodenojejunal junction to the right of the spine, a corkscrew or 'whirlpool' appearance of the proximal small bowel when volvulus is present, and a duodenum that does not cross the midline. Ultrasound may show inversion of the SMA-SMV relationship (SMV normally lies to the right of the SMA; in malrotation the orientation may be reversed) and the 'whirlpool sign' of volvulized bowel and mesentery around the SMA.

If volvulus is suspected — particularly in the neonate with bilious emesis and any hemodynamic concern — proceed directly to the operating room. Delaying for further imaging in this setting is a known fatal error.

Transverse supraumbilical or laparoscopic access is used. The bowel is delivered and inspected. The first priority is detorsion of any volvulus: untwist the bowel counterclockwise — the classic teaching is 'turning back the hands of time' — until the mesentery lies flat and arterial flow returns. Severely ischemic bowel may regain perfusion after detorsion; ambiguous segments are wrapped in warm sponges and reassessed before any resection.

Frankly necrotic bowel is resected. Borderline bowel is left alone, and a planned second-look laparotomy at 24–48 hours is undertaken to reassess before committing to extensive resection — extensive resection in the neonate produces short-gut syndrome with lifelong morbidity.

Ladd's bands are then divided. These peritoneal attachments run from the cecum across the duodenum to the right gutter; dividing them releases the duodenum and allows the entire small bowel to assume a more anatomically protective position.

The mesentery is then broadened: the peritoneum overlying the mesenteric root is incised, exposing and broadening the narrow pedicle. This is the key step that protects against future volvulus by widening the base of the mesentery.

The small bowel is positioned in the right side of the abdomen and the colon in the left — the opposite of normal anatomy — to maximize the distance between the duodenojejunal junction and the ileocecal valve along the mesenteric axis, again reducing volvulus risk.

An incidental appendectomy is performed because the appendix will lie in the left upper quadrant after the Ladd's, and a future presentation of appendicitis with atypical location would be difficult to recognize.

Laparoscopic Ladd's is feasible in stable patients without volvulus or with limited volvulus and viable bowel. It involves the same principles: detorsion, division of Ladd's bands, broadening of the mesentery, and appendectomy. In the setting of volvulus with concern for ischemia, open laparotomy provides better tactile assessment of bowel viability and is the safer choice.

Postoperative care includes nasogastric decompression, IV fluids, and gradual advancement of feeds. Patients with significant bowel resection may require TPN. Recurrent volvulus after a properly performed Ladd's is rare but possible. Recurrent symptoms warrant repeat imaging and re-exploration if concerning.

Operative complications include injury to the duodenum, mesenteric vessels, or SMA during dissection; inadequate broadening of the mesentery (predisposing to recurrent volvulus); and missed segmental ischemia (where second-look laparotomy is protective). Long-term complications include adhesive bowel obstruction (high incidence after Ladd's, perhaps the highest of any pediatric operation), short-gut syndrome after major bowel resection, and feeding intolerance.

Examiners commonly probe the bilious-emesis infant scenario in detail: the imaging workup, the urgency of operation, the operative sequence (detorsion first, then bands, then mesentery, then appendectomy), the principle of bowel preservation through second-look, and the rationale for placing small bowel right and colon left.