Unconfined Compression Experimental Protocol for Cartilage Explants and Hydrogel Constructs: From Sample Preparation...

Area of Science:

• Biomedical Engineering
• Materials Science
• Biomechanics

Background:

• Articular cartilage and hydrogel constructs exhibit complex biphasic mechanical behavior.
• Accurate mechanical characterization is crucial for understanding tissue function and developing biomaterials.
• Existing methods face challenges in capturing the intricate properties of these materials.

Purpose of the Study:

• To describe a comprehensive protocol for the unconfined compression testing of articular cartilage and cell-seeded hydrogels.
• To enable inverse mechanical characterization of biphasic biomaterials.
• To provide a standardized methodology for researchers in the field.

Main Methods:

• A step-by-step protocol for unconfined compression testing is detailed.
• The method covers sample preparation, testing procedures, and parameter identification.
• Inverse analysis techniques are employed for material property determination.

Main Results:

• The protocol was successfully applied to alginate hydrogel constructs.
• Experiments were conducted on preserved and damaged human hip cartilage explants.
• The study demonstrates the feasibility of the protocol for diverse biphasic materials.

Conclusions:

• The described protocol offers a robust approach for the mechanical characterization of articular cartilage and hydrogels.
• This methodology facilitates a deeper understanding of biphasic material behavior.
• The findings support advancements in biomaterial development and tissue engineering.