Centre for Forensic and Legal Medicine, University of Dundee, Dundee, Scotland, UK.
Forensic Sci Int. 2011 May 20;208(1-3):91-4. doi: 10.1016/j.forsciint.2010.11.015. Epub 2010 Dec 17.
Stab wounds were made in porcine cartilage with 13 serrated knives, amongst which 4 were drop-point and 9 straight-spine; 9 coarsely serrated, 3 finely serrated and 1 with mixed pattern serrations. The walls of the stab tracks were cast with dental impression material, and the casts photographed together with the knife blades for comparison. All 13 serrated blades produced an "irregularly regular" pattern of striations on cartilage in all stabbings. Unusual and distinctive blade serration patterns produced equally distinctive wound striation patterns. A reference collection of striation patterns and corresponding blades might prove useful for striation pattern analysis. Drop-point blades produced similar striations to straight-spine blades except that the striations were not parallel but rather fan-shaped, converging towards the wound exit. The fan-shaped striation pattern characteristic of drop-point blades is explained by the initial lateral movement of the blade through the cartilage imposed by the presence of the drop point shape. It appears that the greater the overall angle of the drop point, the shorter the blade length over which the drop point occurs, and the closer the first serration is to the knife tip, the more obvious is the fan-shaped pattern. We anticipate that micro-irregularities producing individualising characteristics in non-serrated drop point blades, provided they were located at the tip opposite the drop point, should also show a fan-shaped pattern indicative of a drop point blade. The examination of the walls of stab wounds to cartilage represents an under-utilised source of forensic information to assist in knife identification.
用 13 把锯齿刀在猪软骨上制造刺伤，其中 4 把为水滴形刀尖，9 把为直脊；9 把锯齿较粗，3 把锯齿较细，1 把混合模式锯齿。用齿科印模材料浇铸刺伤通道的壁，并将铸型与刀片一起拍照进行比较。所有 13 把锯齿刀片在所有刺伤中都在软骨上产生了“不规则的规则”条纹图案。不同寻常且独特的刀片锯齿模式产生了同样独特的伤口条纹图案。条纹图案和相应刀片的参考收藏可能对条纹图案分析有用。水滴形刀尖刀片产生的条纹与直脊刀片相似，只是条纹不是平行的，而是扇形的，向伤口出口汇聚。水滴形刀尖刀片特有的扇形条纹图案是由刀尖形状导致的刀片初始横向运动引起的。似乎，水滴形刀尖的总角度越大，发生水滴形刀尖的刀片长度越短，第一个锯齿越靠近刀尖，扇形图案越明显。我们预计，如果非锯齿形水滴形刀尖刀片上的个别化特征的微观不规则性位于与水滴形刀尖相对的刀尖处，也应该显示出指示水滴形刀尖刀片的扇形图案。检查软骨刺伤的壁代表了一种未充分利用的法医信息来源，可以帮助识别刀具。
