Zohn Allison, Melinek Judy
From the *University of California, Davis; †Alameda County Sheriff-Coroner, Oakland; and ‡PathologyExpert Inc, San Francisco, CA.
Am J Forensic Med Pathol. 2017 Sep;38(3):180-183. doi: 10.1097/PAF.0000000000000318.
Forensic pathologists who autopsy stab wound victims may be called upon to determine whether a specific weapon recovered as evidence caused the decedent's wounds. Some forensic training programs instruct pathologists to excise wounds and place them in formalin. There is little published information about the reliability of these assessments. To address these deficiencies, a porcine model was used to establish the limits of in situ knife wound measurements of wounds caused by 3 knives of different widths stabbed at 90 degrees to the skin surface. The results indicate that within the 95% confidence interval, most stab wounds when measured on the surface of the skin will be within 1 to 3 mm of the size of the knife blade. Four wounds from different anatomical areas of the pig were excised from the body, and after excision, their measurements differed from their in situ length. After fixation in a 10% buffered formalin solution, one wound stayed the same, one wound lengthened, one shrunk minimally, and the one from the thinner abdominal skin shrunk by 6 mm (11%). This study presents a porcine model that can be used to define parameters for testimony.
对刺伤受害者进行尸检的法医病理学家可能需要确定作为证据找回的特定武器是否造成了死者的伤口。一些法医培训项目指导病理学家切除伤口并将其置于福尔马林中。关于这些评估的可靠性，公开信息很少。为了弥补这些不足，使用了一个猪模型来确定由3把不同宽度的刀以与皮肤表面成90度角刺入造成的伤口的原位刀伤测量极限。结果表明，在95%置信区间内，大多数刺伤在皮肤表面测量时，其大小将在刀片大小的1至3毫米范围内。从猪的不同解剖区域切下4个伤口，切除后，它们的测量长度与原位长度不同。在10%缓冲福尔马林溶液中固定后，一个伤口保持不变，一个伤口变长，一个伤口略有收缩，而来自较薄腹部皮肤的伤口收缩了6毫米（11%）。本研究提出了一个可用于定义证词参数的猪模型。
