Sensitivity of a two-dimensional biomorphoelastic model for post-burn contraction

Area of Science:

• Biophysics
• Computational Biology
• Tissue Engineering

Background:

• Post-burn scar contraction is a complex process involving mechanical forces and cellular signaling.
• Understanding the biomechanics of scar tissue is crucial for developing effective treatments.

Purpose of the Study:

• To develop and analyze a two-dimensional biomorphoelastic model of post-burn scar contraction.
• To identify key parameters influencing scar contraction and tissue strain.

Main Methods:

• A two-dimensional biomorphoelastic model incorporating mechanical properties, cellular components (fibroblasts, myofibroblasts), and signaling molecules.
• Sensitivity analysis was performed on independent model parameters.
• Model adaptation included differentiating fibroblast and myofibroblast proliferation rates.

Main Results:

• The model simulates skin displacement and effective Eulerian strain.
• Sensitivity analysis revealed Poisson's ratio, equilibrium collagen concentration, contraction inhibitor constant, and myofibroblast apoptosis rate as most influential parameters.
• Altering fibroblast and myofibroblast proliferation rates significantly impacted model outcomes.

Conclusions:

• The biomorphoelastic model provides insights into scar contraction mechanisms.
• Specific parameters critically influence scar tissue mechanics and surface area.
• Differential proliferation rates of key cell types have a substantial effect on scar contraction dynamics.