Spatially Controlled Templated Hydrogels for Orthopedic Interfacial Tissue Regeneration

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Effective regeneration of orthopedic interfacial tissues requires scaffolds that mimic their complex spatial structure.
• Existing methods often create hard interfaces, hindering tissue integration and regeneration.
• A flexible and controllable method is needed to produce scaffolds with tunable properties.

Purpose of the Study:

• To develop a method for producing hydrogel scaffolds with spatially tunable arrangements and chemistries (SSTACs).
• To create scaffolds that recapitulate the spatial complexity of orthopedic interfacial tissues without hard interfaces.
• To demonstrate the ability to control pore size and chemical composition across integrated scaffold interfaces.

Main Methods:

• Utilized solvent-induced phase separation/fused salt templating (SIPS/salt) to create scaffold elements.
• Incorporated UV-reactive macromers for controlled crosslinking and fusion.
• Physically configured and fused pre-fabricated scaffold elements to form SSTACs, including an osteochondral interface model.

Main Results:

• Achieved spatial control over pore size and chemical composition within the hydrogel scaffolds.
• Demonstrated the formation of relatively smooth and integrated interfaces between different scaffold layers.
• The engineered interface exhibited shear force resistance comparable to scaffolds lacking a distinct interface.

Conclusions:

• The SIPS/salt method enables the creation of SSTACs with precise spatial control over physical and chemical properties.
• SSTACs successfully mimic the complex structure of orthopedic interfacial tissues and form integrated, robust interfaces.
• This approach offers a promising strategy for advancing orthopedic tissue regeneration by overcoming the challenge of hard interfaces.