From microparticles to bulk hydrogels: emerging granular hydrogels in cartilage tissue engineering

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Articular cartilage has limited self-repair capacity, driving research into biomaterials for tissue regeneration.
• Injectable hydrogels are promising for minimally invasive delivery and bioprinting, but conventional types lack sufficient microporosity.
• Granular hydrogels, formed from packed microparticles, overcome limitations of bulk hydrogels for enhanced regeneration.

Purpose of the Study:

• To review advancements in granular hydrogel technology for cartilage tissue repair.
• To explore fabrication methods of hydrogel microparticles and jamming strategies.
• To discuss the potential of granular hydrogels in minimally invasive procedures and as bioinks.

Main Methods:

• Review of current literature on granular hydrogel fabrication and applications.
• Focus on microparticle synthesis and jamming techniques for bulk hydrogel formation.
• Analysis of granular hydrogels' properties and their role in cartilage regeneration.

Main Results:

• Granular hydrogels provide superior microporosity and injectability compared to conventional hydrogels.
• These materials better mimic the natural extracellular matrix, promoting efficient tissue regeneration.
• Potential for use in minimally invasive procedures and as smart bioinks for patient-specific implants.

Conclusions:

• Granular hydrogels represent a significant advancement in biomaterials for cartilage regeneration.
• Their unique properties offer solutions for limitations in current tissue repair strategies.
• Further research is needed to translate these innovative materials into clinical applications.