Perforation of the retroperitoneal sigmoid colon secondary to fracture-dislocation of the left sacroiliac joint: case report.

Most traumatic injuries of the sigmoid colon are penetrating, such as those due to stab and bullet wounds, but an occasional patient may have a perforated colon as a result of a pelvic fracture. Such lesions may be occult, resulting in delayed diagnosis, with substantial morbidity. Injury to the sigmoid colon in association with sacroiliac fracture has apparently not been described in the English-language literature. This paper reports such a case and describes the mechanism of injury and its recognition.