In 2007, there were over 6 million motor vehicle accidents in the United States, and of those, 2.5 million were injured and more than 41,000 lost their lives. Spine fractures are a significant cause of morbidity and mortality. This research provides evidence that the combination of air bags and seat belts affords the best protection against spinal fractures sustained in motor vehicle crashes.

China accounts for around 15% of the world's total number of deaths from traffic accidents each year. Motor vehicle production has tripled since the 1990s and despite the availability of seat belts in almost all passenger cars in China and laws requiring restraint use, the habitual use of seat belts is low.