Validation of the American Association for the Surgery of Trauma Organ Injury Scale for Penetrating Colon Injuries

In 2020, the American Association for the Surgery of Trauma (AAST) published a revision of the organ injury scale (OIS) for bowel injuries. The update included for the first time a separate OIS for penetrating colon injuries as well as imaging criteria. To validate the new OIS and its correlation with outcomes, we performed a retrospective review of patients with penetrating colon injuries (AIS<3 in other body regions) between 2016 and 2020 at a single institution. Sixty-six patients met inclusion criteria. Most were young (29 years median) and male (90%). All underwent operative intervention and 23 (34%) had pre-operative imaging. Imaging grade was higher than operative grade in 11 patients (48%). Higher AAST operative grade was associated with a higher likelihood of resection and anastomosis or colostomy, need for damage control laparotomy, and development of intra-abdominal abscess and acute kidney injury. A multicenter study is underway to confirm these findings.