Chance fracture

Lore & Background

The Chance fracture was first described in 1948 by G. Q. Chance, a radiologist working in Manchester, UK. The source article notes that Chance was Irish, though he practiced in Manchester. The fracture was more common in the 1950s and 1960s before shoulder harnesses became common in vehicles.

The mechanism of injury involves excessive flexion of the spine. In some cases there is a transverse break through the bony spinous process, while in others there is a tear of the supraspinous ligament, ligamentum flavum, interspinous ligament, and posterior longitudinal ligament. The fracture is often unstable.

Diagnosis may be suspected on plain X-ray if two spinous processes are excessively far apart. A CT scan of the chest, abdomen, and pelvis is recommended to detect potential abdominal injuries. MRI may also be useful. Treatment may be conservative with a brace or via surgery.

Reader's Guide

The Chance fracture holds significance as a classic injury pattern associated with lap-belt use in motor vehicle collisions, highlighting the importance of seatbelt design. Its description by G. Q. Chance in 1948 provided a clear link between a specific mechanism—excessive flexion of the spine—and a characteristic vertebral fracture. The fracture's association with abdominal injuries, such as splenic rupture, small bowel injury, pancreatic injury, or mesenteric tear, underscores the need for thorough diagnostic evaluation, including CT scanning. The injury may involve disruption of all three spinal columns and is often unstable, requiring either bracing or surgical stabilization. The historical decline in its incidence after the introduction of shoulder harnesses demonstrates how automotive safety advancements can reduce specific injury patterns. The fracture remains rare today but is still encountered in contexts such as falls or being struck by an object. Its legacy lies in its role in understanding spinal biomechanics and improving vehicle safety standards.

Did You Know?

• The Chance fracture was first described in 1948 by G. Q. Chance, a radiologist in Manchester, UK.
• In around half of cases there is an associated abdominal injury such as splenic rupture, small bowel injury, pancreatic injury, or mesenteric tear.
• The fracture was more common in the 1950s and 1960s before shoulder harnesses became common.
• On plain X-ray, a Chance fracture may be suspected if two spinous processes are excessively far apart.