Comparison of car seats in low speed rear-end impacts using the BioRID dummy and the new neck injury criterion (NIC)

Long-term whiplash associated disorders (WAD) 1-3 sustained in low velocity rear-end impacts is the most common disability injury in Sweden. Therefore, to determine neck injury mechanisms and develop methods to measure neck-injury related parameters are of importance for current crash-safety research. A new neck injury criterion (NIC) has previously been proposed and evaluated by means of dummy, human and mathematical rear-impact simulations. So far, the criterion appears to be sensitive to the major car and collision related risk factors for injuries with long-term consequences. To further evaluate the applicability of NIC, four seats were tested according to a recently proposed sled-test procedure. ‘Good’ as well as ‘bad’ seats were chosen on the basis of a recently presented disability risk ranking list. The dummy used in the current tests was the Biofidelic Rear Impact Dummy (BioRID). The results of this study showed that NIC max values were generally related to the real-world risk of long-term WAD 1-3. Furthermore, these results suggested that NIC max calculated from sled tests using the BioRID dummy can be used for evaluating the neck injury risk of different car seats.