Utility of Abdominal Radiographs After Posterior Spinal Fusion for Neuromuscular Scoliosis

Background/Objectives: Postoperative ileus, the temporary cessation of gastrointestinal motility leading to accumulation of fluid and gas in the bowel, is a common complication following posterior spine fusion (PSF) in patients with neuromuscular scoliosis (NMS). Abdominal radiographs (KUBs) are often ordered to differentiate between ileus and mechanical obstruction but expose patients to radiation, add cost, and may lead to unnecessary work up. The aim of this study was to determine how often KUBs led to a change in treatment after PSF in patients with NMS. Methods: A retrospective review was conducted of NMS patients with ≥2-year follow-up treated with PSF between January 2014 and December 2019 at a tertiary pediatric hospital. Results: Of the 133 patients (age 13.7, SD 2.6 years; preoperative curve magnitude 82.8, SD 23.0 degrees; follow-up 44.7, SD 15.4 months), 22.6% (30/133) underwent KUB imaging due to abdominal pain, distension, or delayed return of bowel function. In total, 93.3% (28/30) of the KUB imaging was consistent with ileus. One KUB study resulted in a gastroenterology consultation and bowel cleanout, and one raised concerns regarding possible pneumatosis of the colon, prompting a pediatric surgery consultation and exploratory laparotomy which was unremarkable. Conclusions: KUBs were performed in nearly 25% of NMS patients during the acute postoperative period, but rarely provided useful diagnostic information leading to changes in management. In the presence of postoperative abdominal distension, feeding intolerance, and delayed return of bowel function, we advocate for continuing conservative measures until bowel function returns, reserving abdominal radiographs for patients with a worsening exam despite bowel rest or additional causes for concern.