Not aware of any data off hand. Personally, I do rely on the mechanism
greatly, if the seat is intact and there are no apparent injuries, in
determining need for ongoing immobilization & radiographs.
My threshold is lowered if it has been incorrectly placed, even if intact.
For example, if it was placed in the front seat and the mechanism was a
passenger side collision with significant auto damage, I am much more
concerned. Another issue, which I am sure you are already aware, is airbag
deployment with these front car seats and occult C-spine injuries. It is
quite amazing to me, that despite adequate warning, folks are still placing
infants car seats in the front. BTW, dual air bags are pretty much standard
on most newer model vehichles these days.
Curious to know what your survey shows....
Jay Pershad, MD
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