Smart, Elastic, and Nanofiber-Based 3D Scaffolds with Self-Deploying Capability for Osteoporotic Bone Regeneration

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Materials Engineering

Background:

• Treating irregular osteoporotic bone defects remains a significant clinical challenge.
• Bioactive glass is promising for bone regeneration but limited by brittleness.
• Flexible bioactive glass nanofibers offer a potential solution for enhanced bone defect repair.

Purpose of the Study:

• To fabricate flexible bioactive glass (SiO2-CaO) nanofibers.
• To assemble these nanofibers into 3D fibrous scaffolds using chitosan.
• To evaluate the mechanical properties, in vitro behavior, and in vivo efficacy of the developed scaffolds for bone regeneration.

Main Methods:

• Fabrication of SiO2-CaO nanofibers with varying compositions.
• Assembly of nanofibers into 3D scaffolds using chitosan as a linker.
• Characterization of scaffold mechanical properties, including compression, elasticity, and fatigue resistance.
• In vivo evaluation of scaffold performance in a rat model of osteoporotic calvarial defects.

Main Results:

• Successfully fabricated flexible bioactive glass (SiO2-CaO) nanofibers capable of 180° bending.
• Developed 3D fibrous scaffolds (85SiO2-15CaO NF/CS) with superior mechanical properties and elasticity compared to controls.
• Demonstrated scaffold ability to deform, fit irregular defects, and self-deploy.
• Observed significant promotion of bone regrowth and vascularization in vivo.

Conclusions:

• Flexible bioactive glass nanofibers can be assembled into elastic 3D scaffolds for bone regeneration.
• The 85SiO2-15CaO NF/CS scaffolds show promise for repairing complex, irregular osteoporotic bone defects.
• This advancement offers a new strategy for engineering smart materials in orthopedic applications.