The Erratic Behavior of Lesions in Burnt Bone

Area of Science:

• Forensic Anthropology
• Skeletal Trauma Analysis
• Bioarchaeology

Background:

• Interpreting skeletal trauma in charred remains is challenging due to postmortem alterations.
• Understanding how thermal exposure affects fracture morphology is crucial for forensic investigations.
• Previous research has not comprehensively analyzed the impact of charring on various injury types.

Purpose of the Study:

• To investigate the morphological and metric changes in depressed fractures, drill injuries, and gunshot wounds in charred bovine ribs.
• To evaluate the preservation of morphological features after experimental charring.
• To determine the differential effects of charring on fleshed versus skeletonized bone subjected to ballistic trauma.

Main Methods:

• Fifty bovine ribs with 104 lesions were divided into three groups: blunt force trauma (depressed fractures), drill injuries (circular/semicircular holes), and ballistic trauma (9-mm bullets).
• Specimens were subjected to experimental charring at 800°C in an electric oven.
• Morphological and metric analyses were conducted before and after charring.

Main Results:

• Morphological features of the lesions were generally preserved post-charring.
• Depressed fractures exhibited a statistically significant increase in dimensions (p<0.05), while drilled holes showed significant shrinkage (p<0.01).
• The charring process increased fracture incidence in gunshot wound samples, with differential effects observed between fleshed and defleshed ribs.

Conclusions:

• Charring significantly alters the dimensions of certain bone injuries, complicating direct interpretation.
• The behavior of charred bone under thermal stress is complex and varies by injury type and tissue condition (fleshed vs. skeletonized).
• Forensic analysts must exercise caution when interpreting trauma in charred skeletal remains due to these postmortem modifications.