While looking for information on TBI and the fact that I lost consciousness when injured, I came upon this bit of information. I found it to be very interesting and informative since it also mentions the many ways it can happen.

In the United States traumatic brain injury (TBI) is a leading cause of death for persons under age 45. TBI occurs every 15 seconds. Approximately 5 million Americans currently suffer some form of TBI disability. The leading causes of TBI are motor vehicle accidents, falls, and sports injuries.

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Indirect Trauma
Medical research has discovered another mechanism of brain injury besides direct blunt trauma to the skull. The well-known phenomenon of the Shaken Baby Syndrome is an example. Severe shaking greatly stretches and damages delicate nerve cells, at times causing very significant injury or even death. In adults, severe whiplash can involve severe forces that may shake or rotate the brain enough to cause permanent brain damage.

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Diffuse Axonal Injury
Because Diffuse Axonal Injury causes microscopic damage, it cannot be visualized on CT or MRI scans.

A second method of how the brain can be injured in high speed velocity change scenarios (a fall from a great height, high speed car accident) is called “Isotropic Stress.” Whereas diffuse axonal injury involves the deforming or stretching of the brain tissue, resulting in tearing, isotropic stress causes damage through a “pulse” or “pressure wave” that moves through the brain at extraordinarily high speeds. The damage is caused by a sudden change in the density of the inside of an individual brain cell. The instant compression causes damage to the internal structures of the brain cells.

Many of these same types of injuries have been discovered and treated in veterans returning from the Iraq war. They have often been exposed to the proximity blast of explosive charges. The pressure or pulse from the explosion moves through their body and as it move through the brain it causes damage to the cells. Although many of these soldiers look “fine” and have no bleeding, they can and will suffer serious brain injury as a result.

Because of the large number of veterans injured in this way, lots of research is being done on this type of brain injury at the present time and there should be studies available for an update on this new insight into TBI in mid-2008.
http://www.braininjury.com/injured.html

If this is in wrong forum, please change. Thank you.

Raven