Tough, Injectable Calcium Phosphate Cement Based Composite Hydrogels to Promote Osteogenesis

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Orthopedic Engineering

Background:

• Osteoporosis leads to disabling fractures and increased mortality, highlighting the need for effective fracture healing and treatment.
• Current challenges exist in combining clinically approved materials for injectable, moldable bone defect treatments with adequate mechanical support.
• Developing advanced biomaterials is crucial for managing osteoporotic fractures and improving patient outcomes.

Purpose of the Study:

• To develop an injectable, tough hydrogel biomaterial for treating osteoporotic fractures.
• To create a composite material bioinspired by natural bone, integrating inorganic and organic components.
• To enhance mechanical properties and bioactivity for effective bone defect repair.

Main Methods:

• Fabrication of an injectable hydrogel by combining calcium phosphate cement (CPC) with gelatin methacryloyl (GelMA) and N-Hydroxyethyl acrylamide (HEAA) precursors.
• Utilizing ultraviolet (UV) photo-initiation for rapid polymerization and crosslinking.
• Characterization of the resulting GelMA-poly (N-Hydroxyethyl acrylamide) (GelMA-PHEAA) hydrogel for mechanical performance and bioactivity.

Main Results:

• A tough, injectable hydrogel was successfully synthesized, firmly loading calcium phosphate cement (CPC).
• The GelMA-PHEAA network provided enhanced mechanical properties and maintained the bioactivity of CPC.
• The composite material demonstrated potential for effective bone defect filling and support.

Conclusions:

• The developed biomimetic hydrogel, integrating bioactive CPC, is a promising injectable material for osteoporotic fracture treatment.
• This material addresses the challenge of combining injectability, moldability, and mechanical support for bone regeneration.
• Further clinical translation could significantly improve outcomes for patients suffering from osteoporotic fractures.