INVESTIGADORES
GONZALEZ paula Natalia
artículos
Título:
Analysis of experimental cranial skin wounding from screwdriver trauma.
Autor/es:
KIESER J; BERNAL V.; GONZALEZ P; BIRCH W; TURMAINE M; ICHIM I.
Revista:
INTERNATIONAL JOURNAL OF LEGAL MEDICINE.
Referencias:
Año: 2007 p. 179 - 187
ISSN:
0937-9827
Resumen:
As part of a more extensive
investigation of skin wounding mechanisms, we studied wounds created by five
common screwdrivers (straight, star, square or Robertson, Posidriv and
Phillips) on the shaven foreheads of 12 freshly slaughtered pigs. We fixed the
different screwdriver heads to a 5-kg metal cylinder which was directed
vertically onto each pig head by a droptube of 700 mm length. We examined skin
lesions by photography and also by scanning electron microscopy (SEM). Our
evaluation of differences in wound shape and size was based on geometric
morphometric methods. Our results show that there are obvious morphological
differences between the straight head and the other types. The straight-headed
screwdriver penetrates the skin by a mode II crack which results in a compressed
skin plug with bundles of collagen fibres forming skin tabs within the actual
wound. The sharpertipped screwdrivers wedge open the skin (mode I), with a
clearly defined edge with no skin plugs. Geometric morphometric analysis
indicates that shapes of skin wounds created by the five screwdriver types
could be classified into three different groups. The straight head results in
the most differentiated wound profile, with the Robertson or square and some
specimens of star, and also the Posidriv and Phillips giving similar wound
outlines. SEM evaluation of wounds created by a new and worn straight-head
screwdrivers shows that the outline of the worn screwdriver head is reflected
in the shape of the wound it created.