Development of a micro-tissue-mediated injectable bone tissue engineering strategy for large segmental bone defect...

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Orthopedic Surgery

Background:

• Bone tissue engineering faces clinical limitations due to challenges in cell sourcing and complex, inefficient construction processes.
• Existing strategies like injectable bone tissue engineering (iBTE) and osteogenic cell sheets have limitations, particularly for large segmental and load-bearing bone defects.

Purpose of the Study:

• To develop a novel injectable bone tissue engineering (iBTE) strategy for repairing large segmental bone defects.
• To establish an osteogenic micro-tissue in situ repair strategy that simplifies construction and improves efficiency.

Main Methods:

• Fabrication of a biodegradable 3D scaffold using 3D printing technology tailored to the defect size.
• Implantation of the scaffold to provide structural support and space for bone regeneration.
• Injection of osteogenic micro-tissue (cell-extracellular matrix complex) into the scaffold to promote in situ bone regeneration, with comparison to injected digested cells.

Main Results:

• The osteogenic micro-tissue strategy demonstrated significantly higher cell usage efficiency compared to using digested cells.
• A superior bone defect repair effect was observed with the osteogenic micro-tissue compared to the control group.

Conclusions:

• The developed osteogenic micro-tissue in situ repair strategy presents a more effective approach for addressing large segmental bone defects.
• This innovative strategy holds significant promise for future clinical applications in bone defect repair.