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Fatal non-accidental pediatric cranial fracture risk and three-layered cranial architecture development
Donna C Boyd1,2, Kimber G Cheek3, C Clifford Boyd1
1Department of Anthropological Sciences, Radford University Forensic Science Institute, Radford, Virginia, USA.
Insights
Pediatric non-accidental injury (NAI) involving blunt force trauma (BFT) poses a higher risk to the lateral cranial vault in children under two. This is due to the delayed development of the three-layered cranial architecture, leaving bones thin and vulnerable.
Area of Science:
- Forensic Anthropology
- Pediatric Traumatology
- Craniofacial Development
Background:
- Understanding the developing pediatric cranium is crucial for interpreting blunt force trauma (BFT) injuries.
- Non-accidental injury (NAI) in children presents unique challenges in distinguishing inflicted trauma from accidental injury.
- The three-layered cranial architecture (tables and diploë) develops over time, potentially influencing bone strength and fracture patterns.
Purpose of the Study:
- To examine how the development of the three-layered cranial architecture influences outcomes of blunt force trauma (BFT) in pediatric non-accidental injury (NAI).
- To identify specific regions of the pediatric cranium that are more vulnerable to BFT due to developmental factors.
- To correlate cranial development stages with fracture risk in pediatric BFT cases.
Main Methods:
- Macroscopic and microscopic analysis of subadult crania (perinatal to 17 years) to assess cranial vault thickness and three-layer differentiation.
- Chronicle the ontogenetic development, spatial, and temporal variability of cranial architecture.
- Compare fracture locations from known pediatric BFT cases with identified high-risk impact regions on the developing cranium.
Main Results:
- Cranial vault thickness increases with age, accelerating in the first two years due to brain growth.
- Three-layer differentiation initiates by 3-6 months but is not consistent until 18 months-2 years; diploë is underdeveloped until after age 4.
- The lateral cranial vault shows delayed development and reduced three-layer architecture, persisting into adulthood, correlating with higher fracture risk in BFT cases, especially in children under two.
Conclusions:
- The developing three-layered cranial architecture, particularly its delayed formation in the lateral vault, renders young children vulnerable to blunt force trauma.
- The lateral cranial vault in subadults under two years old represents a high-risk region for fractures resulting from non-accidental blunt force trauma.
- Understanding these developmental patterns is critical for accurate forensic interpretation of pediatric cranial injuries.
Abstract:
This study examines the influence of three-layered cranial architecture development upon blunt force trauma (BFT) cranial outcomes associated with pediatric non-accidental injury (NAI). Macroscopic and microscopic metric and morphological comparisons of subadult crania ranging from perinatal to 17 years of age chronicle the ontogenetic development and spatial and temporal variability in the emergence of a mature cranial architecture. Cranial vault thickness increases with subadult age, accelerating in the first 2 years of life due to rapid brain growth during this period. Three-layer differentiation of the cranial tables and diploë initiates by 3-6 months but is not consistently observed until 18 months to 2 years; diploë formation is not well developed until after age 4 and does not manifest a mature appearance until after age 8. These results allow topographic documentation of cortical and diploic development and temporal and spatial variability across the growing cranium. The lateral cranial vault is identified as expressing delayed development and reduced expression of the three-layer architecture, a pattern that continues into adulthood. Comparison of fracture locations from known BFT pediatric cases with identified cranial fracture high-risk impact regions shows a concordance and suggests the presence of a higher fracture risk associated with non-accidental BFT in the lateral vault region in subadults below the age of 2. The absence or lesser development of a three-layered architecture in subadults leaves their cranial bones, particularly in the lateral vault, thin and vulnerable to the effects of BFT.
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