Having recently reviewed the editorial piece detailing Dr Berry's opinions regarding chronic whiplash syndrome, I was struck by the fragility of Dr Berry's hypothesis that chronic pain complaints following whiplash injury result from a functional disorder.1 This fragility was due to the fact that Dr Berry's theory revolves around one assumption: that the observation of "parallel identical injuries" of 20 demolition derby drivers is a reasonable proxy for the millions of whiplash injuries that occur annually as a result of non–demolition derby crashes, and that the variation of injury response in the 20 drivers represents the variability of injury response in the general population.
Freeman MD. Are Demolition Derby Drivers a Valid Proxy for the Population at Risk for Whiplash Injury?. Arch Neurol. 2001;58(4):680-681. doi: