Experimental Study Of Alternating Current Injury Imposed On Ossa

Objective: The purpose of this experiment was to investigate the differences among electrically injured bones ,putrefied bones and the normal ones by the morphological study and element survey in these bones. What all had done is aimed to provide objective and quantitative indexes for forensic pathological diagnosis of electrical injury, especially in the cases in which nothing being left, but putrefied bones .Methods: the experiment was divided into eight groups, including: the antemortem electrical injury (immediately, 5s, 30s, 1min and 2min),postmortem electrical injury, putrefied and the normal ones. After Specimens from each group being taken X ray examination, all specimens were dried and sprayed with gold, and then observed the morphological appearance of the surface of the bones with scanning electron microscopy(SEM), meanwhile, measured the long axes of the holes distributing the electrical injury area. Lastly, detected the kinds and contents of element in the electrical injury area with energy spectrum . Results: 1. 220V AC could make subperiosteum bleed. By contrast to the putrefied bones and normal ones, the density of electrical injury area rise with X-ray examination.2. On the surface of 220V AC injured bones, there are characteristic appearance, that's, many small holes disorderly distribute the electrical injury area and the holes were enclosed by high-density shadow , however, the surface of the normal bones are absent the appearance. There are many large holes on the surface of the putrefied bones, Meanwhile, the holes orderly distribute all over the bones and the long axes of the large holes and small holes inside the large ones are parallel each other.3. The kinds of elements in the high density shadow surrounding the holes are almost same among the electrical injured bones , putrefied and normal ones. However ,by contrast to the putrefied and normal bones, the contents of element calcium phosphorus and carbon in the the electrical injured bones.Conclusion: 1. 220V AC could injury the bones with morphologic changes on the surface of electrified area, such as disordered cortex and small holes. Meantime, it could cause contents of the elements to change. However the big holes could been seen on the surface of the putrefied bones. 2. the disordered cortex, small holes on the surface of electrified area and the detection of contents of the elements in the high-density surrounding the holes could be a index for the diagnosis of AC injury and able to differentiate of the antemortem electrical injury , the postmortem electrical injury and the putrefied bones. 3.the examination of X ray could be a assistant index for the diagnosis of AC injury 4. the morphologic changes of small holes and the alteration of the contents of elements such as calcium, phosphorus and carbon could be helpful to estimate the time of electrical injury.