The occurrence of acute subdural haematoma and diffuse axonal injury as two typical acceleration injuries.

Closed head injuries have already been classified into contact injuries and acceleration-deceleration injuries. Two typical acceleration-deceleration injuries and at the same time, the two worst head injuries are acute subdural haematoma (ASDH) and diffuse axonal injury (DAI), and that is where they got their medico-legal importance. Using experiments, it has been shown that acceleration with an impact time of more than 20-25 min (which occurs in traffic accidents in real life) causes DAI, whereas an impact time of 5-10 min is more likely to produce acute subdural haematoma. The aim of this research is to show that not all, but some types of traffic accidents are more typical for the occurrence of DAI, as well as that the ASDH is not a common feature for all types of fall. The analysis conveyed covered 80 cases of closed head injuries (traffic accidents, falls and assaults) where a complete forensic medical autopsy has been undertaken, followed by a complete forensic-neuropathological examination. For the purpose of diagnosing DAI, immunohistochemistry using antibody against β-amyloid precursor protein has been involved. Results show that ASDH is more likely to occur in cases of simple fall, assaults and cyclists and DAI is more typical for vehicular traffic accidents and cases of falling from a considerable height. The paper also comprises discussion about some open questions regarding the diagnosis of DAI in the medico-legal practice.