Mild traumatic brain injury (TBI) is a very common injury, resulting i
n immediate and possible long-term symptoms. The accurate and consiste
nt definition of mild TBI is important in the initial and rehabilitati
on management of the injury, and in research concerning mild TBI. A de
finition of mild TBI has been developed by the Head Injury Interdiscip
linary Special Interest Group of the American Congress of Rehabilitati
on Medicine. Within the spectrum of injury severity in mild TBI there
are several classification systems, primarily used in management of ac
ute mild TBI, that breakdown mild TBI into grades of injury severity.
These are based upon the presence or absence of mental status changes,
amnesia, loss of consciousness, anatomical lesion or neurological def
icit.