It may surprise you but approximately one quarter or more of the patients I examine are unsure if they have sustained a concussion. Ninety percent of concussive injuries do NOT involve a loss of consciousness. This past week, I examined a 10 year old who could not identify a specific incident in the game producing a concussion, but he reported one tackle that resulted in dizziness. After the game he had a headache, and this increased with physical or mental activity. Most probably, he did sustain a concussion.
This video provides an illustration of the forces that can result in a concussive injury without the player necessarily knowing which event actually produced the forces necessary to produce a concussion.
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