Using point clouds to investigate the relationship between trabecular bone phenotype and behavior: An example...

Area of Science:

• Human skeletal biology
• Paleoanthropology
• Biomechanics

Background:

• Trabecular bone analysis is crucial for understanding skeletal adaptation.
• Previous methods lacked detailed 3D spatial resolution.
• Comparing bone structure across different subsistence strategies offers insights into evolutionary pressures.

Purpose of the Study:

• To present a new 3D analytical method for trabecular bone volume fraction and degree of anisotropy.
• To compare these bone properties between human groups with distinct subsistence strategies.

Main Methods:

• Utilized automatic mesh and point-cloud registration for precise 3D analysis.
• Performed point-by-point statistical comparisons of bone properties across the calcaneus.
• Analyzed two groups: Black Earth (hunter-gatherers) and Norris Farms (agriculturalists).

Main Results:

• Bone volume fraction and anisotropy patterns were similar but differed in magnitude between groups.
• Hunter-gatherers exhibited higher bone volume fraction and less anisotropic bone.
• Findings align with biomechanical expectations for walking and running forces.

Conclusions:

• The 3D analytical method effectively identifies localized skeletal differences.
• This approach enhances understanding of how bone structure relates to mechanical environments.
• It allows for nuanced comparisons of skeletal morphology between populations.