Experimental simulation of non-ballistic wounding by sharp and blunt punches

  • Brittany Wong
  • Jules A. KieserEmail author
  • Ionut Ichim
  • Michael Swain
  • Vicki Livingstone
  • Neil Waddell
  • Michael Taylor
Original Paper


Despite a long history of gross and microscopic descriptions of blunt and sharp force injury to the dermal tissues, few have addressed the mechanisms underlying such trauma. The need to develop an understanding of how non-ballistic injury occurs calls for an ability to biomechanically model the process. We recently introduced a basic skin and subcutaneous model, which we used to investigate wounding from a spherical object. Here we employ the same model to examine wounding caused by a sharp wedge shaped object and a blunt rectangular object. Macroscopic examination and SEM views of the surface and cross sections of blunt and sharp force tears show that while in the former there is a clean cut through the skin into the underlying sponge, in the latter there is a tissue plug confined to the skin that is smaller than the impacting rectangle. Fracture initiation in the subdermal tissue occurs at the angles of the impacting object. In sharp force trauma, there is localized breaching of the skin layer coupled with the wedging action of the impacting object. Because the subdermal tissue, in this case the underlying hydrated foam, is attached to the base of the skin, it will contribute to further tearing of the foam beneath the line of contact.


Forensic science Traumatology Skin wounding biomechanical modeling 


  1. 1.
    Kieser J, Bernal V, Gonzalez P, Birch W, Turmaine M, Ichim I. Analysis of experimental cranial skin wounding from screwdriver trauma. Int J Legal Med. 2008;122:179–87.Google Scholar
  2. 2.
    Ohshima T. Forensic wound examination. J Forensic Sci. 2000;113:153–64.CrossRefGoogle Scholar
  3. 3.
    Rawson RB, Starich GH, Rawson RD. Scanning electron microscopic analysis of skin resolution as an aid in identifying trauma in forensic investigations. J Forensic Sci. 2000;45:1023–7.PubMedGoogle Scholar
  4. 4.
    Thali MJ, Braun M, Dirnhofer R. Optical 3D surface digitizing in forensic medicine: 3D documentation of skin and bone injuries. J Forensic Sci. 2003;137:203–8.CrossRefGoogle Scholar
  5. 5.
    March J, Schofield D, Evison M, Woodford N. Three-dimensional computer visualization of forensic pathology data. Am J Forensic Med Pathol. 2004;25:60–70.PubMedCrossRefGoogle Scholar
  6. 6.
    Hernandez-Cueto C, Girela E, Sweet DJ. Advances in the diagnosis of wound vitality: a review. Am J Forensic Med Pathol. 2000;21:21–31.PubMedCrossRefGoogle Scholar
  7. 7.
    Bonelli A, Bacci S, Norelli GA. Affinity cytochemistry analysis of mast cells in skin lesions: a possible tool in the timing of lesions after death. Int J Legal Med. 2004;117:331–4.CrossRefGoogle Scholar
  8. 8.
    Knight B. The dynamics of stab wounds. J Forensic Sci. 1975;6:249–55.CrossRefGoogle Scholar
  9. 9.
    Green MA. Stab wound dynamics—recording technique for use in medico-legal investigations. J Forensic Sci. 1978;18:161–3.CrossRefGoogle Scholar
  10. 10.
    Ankerson J, Birbeck AE, Thomson RD, Vanezis P. Puncture resistance and tensile strength of skin. Proc Int Mech Eng. 1999;213H:493–501.CrossRefGoogle Scholar
  11. 11.
    O’Callaghan PT, Jones MD, James DS, Leadbeatter S, Holt CA, Nokes LDM. Dynamics of stab wounds: force required for penetration of various cadaveric human tissues. Forensic Sci Int. 1999;104:173–8.PubMedCrossRefGoogle Scholar
  12. 12.
    Ridge MD, Wright V. Mechanical properties of skin: a bioengineering study of skin structure. J Appl Physiol. 1966;21:1602–6.PubMedGoogle Scholar
  13. 13.
    Shergold OA, Fleck NA. Mechanism of deep penetration of soft solids, with application to the injection and wounding of skin. Proc R Soc Lond A. 2004;460:3037–58.CrossRefGoogle Scholar
  14. 14.
    Shergold OA, Fleck NA. Experimental investigation into the deep penetration of soft solids by sharp and blunt punches, with application to the piercing of skin. Trans ASME. 2005;127:838–48.Google Scholar
  15. 15.
    Whittle K, Kieser JA, Ichim I, Swain M, Waddell N, Livingstone V, Taylor M. The biomechanical modelling of non-ballistic skin wounding: blunt force injury. Forensic Sci Med Pathol. 2008;4:33–9.CrossRefPubMedGoogle Scholar
  16. 16.
    Kieser JA, Whittle K, Wong B, Ichim, I, Waddell JN, Swain M, Taylor M, Nicholson H. Understanding craniofacial blunt force injury: a biomechanical perspective. Forensic Pathol Rev (in press).Google Scholar
  17. 17.
    Smalls LK, Wickett RR, Visscher MO. Effect of dermal thickness, tissue composition, and body site on skin biomechanical properties. Skin Res Technol. 2006;12:43–9.PubMedCrossRefGoogle Scholar
  18. 18.
    Sneddon IN. The relation between load and penetration in the axisymmetric problem for a punch of arbitrary profile. Int J Eng Sci. 1965;3:47–51.CrossRefGoogle Scholar
  19. 19.
    Mohajna A, Aboud N, Harbaji I, Agbaria A, Michaelson M, Fisher M. Blunt and penetrating injuries caused by rubber bullets during the Israeli-Arab conflict in October 2000: a retrospective study. Lancet. 2002;359:1795–800.CrossRefGoogle Scholar
  20. 20.
    Young F. Cavitation. London: Imperial College Press; 1999.Google Scholar

Copyright information

© Humana Press 2008

Authors and Affiliations

  • Brittany Wong
    • 1
  • Jules A. Kieser
    • 1
    Email author
  • Ionut Ichim
    • 2
  • Michael Swain
    • 2
  • Vicki Livingstone
    • 3
  • Neil Waddell
    • 2
  • Michael Taylor
    • 4
  1. 1.Department of Oral Sciences, Faculty of DentistryUniversity of OtagoDunedinNew Zealand
  2. 2.Department of Oral Rehabilitation, Faculty of DentistryUniversity of OtagoDunedinNew Zealand
  3. 3.Department of Preventive and Social Medicine, Dunedin School of MedicineUniversity of OtagoDunedinNew Zealand
  4. 4.Institute for Environmental Science and ResearchChristchurchNew Zealand

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