Bone formation in transforming growth factor beta-I-loaded titanium fiber mesh implants

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Orthopedic Research

Background:

• Porous titanium (Ti) scaffolds are investigated for bone regeneration.
• Osteoconductive and osteoinductive properties are crucial for scaffold efficacy.
• Growth factors, like recombinant human Transforming Growth Factor beta-1 (rhTGF-beta1), can enhance bone healing.

Purpose of the Study:

• To evaluate the osteoconductive and osteoinductive potential of porous Ti fiber mesh.
• To assess the effect of calcium phosphate (Ca-P) coating on Ti scaffolds.
• To determine the impact of rhTGF-beta1 loading on bone formation within Ti scaffolds.

Main Methods:

• A rabbit cranial defect model was used with porous Ti implants.
• Implants included non-coated Ti, Ca-P coated Ti, and rhTGF-beta1 loaded Ti.
• Histological and image analyses were performed at 8 weeks post-implantation.

Main Results:

• rhTGF-beta1 loaded Ti implants showed significantly higher bone ingrowth (97%) and bone fill (36%) compared to non-loaded implants (54-57% ingrowth, 26% fill).
• Bone formation in rhTGF-beta1 loaded implants occurred throughout the scaffold, originating centrally.
• No significant difference in bone ingrowth was observed between Ca-P coated and non-coated Ti implants.

Conclusions:

• Porous titanium combined with rhTGF-beta1 effectively induces orthotopic bone formation.
• Ti fiber mesh exhibits favorable osteoconductive properties for bone regeneration.
• A thin Ca-P coating did not enhance the bone-conducting properties of the Ti scaffold in this study.