Osteointegration of functionalised high-performance oxide ceramics: imaging from micro-computed tomography

Area of Science:

• Biomaterials Science
• Orthopedic Research
• Tissue Engineering

Background:

• Evaluating osseointegration of functionalized high-performance oxide ceramics (HPOCs).
• Assessing HPOCs coated with Bone Morphogenetic Protein 2 (BMP-2) or RGD peptides.
• Utilizing micro-computed tomography (micro CT) for in vivo analysis.

Purpose of the Study:

• To evaluate the osseointegration potential of functionalized HPOCs.
• To compare the effects of BMP-2 and RGD peptide coatings on HPOC osseointegration.
• To quantify bone volume/total volume (BV/TV) and trabecular thickness.

Main Methods:

• 36 New Zealand white rabbits were used, with HPOCs functionalized with silanised (SiOx), BMP-2, or RGD.
• High-resolution micro CT was employed to scan samples at 10 µm voxel resolution.
• Bone volume (BV), total volume (TV), and BV/TV ratio were calculated within the coating area.

Main Results:

• Significant increase in BV/TV from 6 to 12 weeks for all groups (silanised, BMP-2, RGD).
• BMP-2 coated HPOCs showed significantly greater ossification at 12 weeks compared to RGD and silanised groups.
• Trabecular thickness increased significantly over time, with BMP-2 promoting greater thickness than silanised HPOCs.

Conclusions:

• Silanised HPOCs, whether alone or functionalized with BMP-2 or RGD, promote in vivo osseointegration.
• HPOCs functionalized with BMP-2 exhibited the most significant osseointegration.
• The findings support the use of BMP-2 functionalized HPOCs for enhanced bone integration.