Chance fracture is a fracture through which vertebral columns?

• A. Posterior Only
• B. Anterior Only
• C. Anterior And Middle
• D. All Three Columns

Answer: (D)

Chance fracture is a flexion-distraction injury from a sudden forward bending force, such as a lap belt during a car crash. This mechanism twists and pulls on the spinal segments, producing a horizontal fracture that traverses the spine through all supporting columns. It disrupts the anterior column (the front portion of the vertebral body and its supporting structures), the middle column (the back half of the vertebral body and the posterior element attachments), and the posterior column (the neural arches, pedicles, facet joints, and other posterior elements). Because all three columns are involved, the injury is highly unstable and at higher risk for displacement and neurologic complications. That’s why the correct answer is that a Chance fracture passes through all three columns, not just a single column or a pair of columns. In practice, this injury most often occurs at the thoracolumbar junction and requires careful evaluation and often surgical stabilization due to its instability.