What is your diagnosis?

Chance fracture, also called a seat belt fracture, is an unstable flexion-distraction fracture that most commonly affects the thoracolumbar junction

Image 1: Case courtesy of Dr Gagandeep Singh, Radiopaedia.org, rID: 7770. Annotation by authors

• Pearl: A distraction injury is a fracture that causes a separation of the two fracture fragments

How does the mechanism specifically cause this injury?

A Chance fracture occurs when the spine flexes over a fulcrum (commonly a lap seat belt) and causes a wedge fracture of the anterior column and a distraction fracture of the middle and posterior column. [1]

Image 2: Case courtesy of Dr Bruno Di Muzio, Radiopaedia.org, rID: 46533. Annotation by authors

What other injuries are associated with this diagnosis?

Given the mechanism of injury, up to 50% of Chance fractures are associated with gastrointestinal injuries such as bowel perforation, bladder perforation, and mesenteric laceration. [1-2]

• Pearl: Although less likely than GI injuries, neurologic deficits can also occur if there is retropulsion of the posterior column into the spinal canal

What is your management in the ED?

The patient should be maintained in strict spinal precautions and a spine surgeon should be consulted as guided by institutional protocols. MRI can better dictate treatment by assessing for spinal stability and posterior longitudinal ligament (PLL) injury. Along with additional trauma workup, patients should likely be admitted for further management. 

• Pearl: Neurologic deficits or PLL injury are generally managed surgically, while immobilization with a cast or TSLO brace may occur in their absence. Nonoperative treatment has an increased risk for scoliosis, kyphosis, and nonunion, making good follow-up vital. [3]