The researchers found that compared with the non-airbag group of crash patients, front-impact airbags were associated with a 45.3 percent reduction in renal injuries and side-impact airbags were associated with a 52.8 percent reduction in renal injuries. The importance of these finding is underscored by the fact that motor vehicle crashes are the most common source of blunt force trauma to the kidney, accounting for from 48 percent to 66 percent of all such injuries.