Characterization of polyvinyl alcohol hydrogels as tissue-engineered cartilage scaffolds using a coupled finite...

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Mechanical Engineering

Background:

• Cartilage tissue engineering requires scaffolds with mechanical strength, biocompatibility, and water absorption.
• Polyvinyl alcohol (PVA) exhibits these desirable properties for scaffold development.

Purpose of the Study:

• To investigate the mechanical properties, specifically viscoelastic and hyperplastic behavior, of PVA hydrogel scaffolds.
• To determine the suitability of PVA hydrogels as cartilage substitutes using computational modeling and experimental data.

Main Methods:

• PVA hydrogel scaffolds were fabricated using a freeze-thaw crosslinking method.
• A coupled finite element (FE)-optimization algorithm was employed alongside stress relaxation experiments.
• Isotropic hyper-viscoelastic constitutive parameters were determined using Mooney-Rivlin and Neo-Hooke strain energy functions.

Main Results:

• The Mooney-Rivlin model provided a better fit to experimental stress-relaxation data compared to the Neo-Hooke model.
• Finite element modeling yielded key mechanical properties, including time-dependent shear and bulk moduli.
• Predicted mechanical responses closely matched experimental observations.

Conclusions:

• PVA hydrogels demonstrate suitable mechanical characteristics for cartilage tissue engineering applications.
• The developed FE model accurately predicts the mechanical behavior of PVA scaffolds.
• PVA hydrogels show potential as a viable cartilage substitute in future therapies pending in vitro and in vivo validation.