Stab injuries involving the vertebral region are rare and pose significant challenges during forensic autopsy due to the complexity of the surrounding anatomical structures. Radiological techniques, such as post-mortem computed tomography (PMCT) or micro-CT, have shown great potential for detecting and detailing sharp bone lesions. We herein present a fatal case of homicidal stab wound involving the left vertebral artery and the homolateral surface of the axis. PMCT identified a fracture of the left lateral mass of the axis (C2), and micro-CT revealed a cortical discontinuity of the left transverse process of C2, nearly separating the transverse process from the body of the axis. Based on micro-CT data, a 3D model of the first three cervical vertebrae was printed in a clear material on a Formlabs Form 3L printer, and a fit-matching analysis was conducted with two potential weapons. The billhook seized by the Police demonstrated a precise fit with the fracture pattern when its handle was positioned posteriorly, and the tip penetrated laterally in a left-to-right trajectory. In conclusion, to the best of our knowledge, this is the first report of vertebral stab wound analysis using a combined micro-CT and 3D printing approach. Although 3D printing is not yet a fully validated forensic method, and further research is needed for identifying any potential errors occurring during production, segmentation, stereolithography data generation, and post-processing, this report highlights the high potentiality of micro-radiology and 3D printing as promising tools for the morphometric analysis of vertebral injuries.
Keywords: 3D-printing; Fit-matching; Forensic radiology; Stab wounds; Vertebral artery; micro-CT.
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