External rib structure can be predicted using mathematical models: An anatomical study with application to...

Area of Science:

• Biomechanics
• Anatomy
• Computational modeling

Background:

• Ribs adapt to mechanical stress, functioning within the chest's pressure vessel dynamics.
• Understanding rib morphology is crucial for analyzing biomechanical responses to stress.

Purpose of the Study:

• To determine the effect of stress on rib morphology by measuring rib height and thickness.
• To develop predictive mathematical models for external rib morphology.

Main Methods:

• CT scans of seven cadaveric rib cages were analyzed for rib height and thickness.
• A Finite Element Analysis (FEA) model was used to calculate intramuscular forces and vector stress.
• Nonlinear quadratic models and Pearson correlation were employed to establish relationships between variables.

Main Results:

• Rib height increased by 13% and thickness by 23% between the 3rd and 7th rib levels (p<0.001).
• Intercostal muscle force showed a significant positive correlation with vector stress (r=0.944, p=0.005).
• Developed nonlinear quadratic models demonstrated statistically significant parameter estimates (p<0.03).

Conclusions:

• External rib morphology, specifically height and thickness, can be accurately predicted using statistical mathematical models.
• Rib height is significantly influenced by calculated intercostal muscle force, indicating environmental impacts on morphology.