A cadaveric study using a 3-dimensional electromagnetic tracking device to asses cervical motion compared the application of a scoop stretcher with two other manual transfer techniques, including log rolling onto an extrication (spine) board. The scoop method restricted cervical spine movement more than log rolling, although this was not statistically significant.

The authors conclude: the effectiveness of the scoop stretcher to limit spinal motion in the destabilized spine is comparable or better than manual techniques currently being used by primary responders.
Are scoop stretchers suitable for use on spine-injured patients?
Am J Emerg Med. 2010 Sep;28(7):751-6