Antibody Mediated Osseous Regeneration (AMOR) in Conjunction With Decortication in Rabbit Calvaria Model

Area of Science:

• Biomaterials Science
• Orthopedic Surgery
• Regenerative Medicine

Background:

• Bone morphogenetic protein-2 (BMP-2) is crucial for osteogenesis.
• Targeting BMP-2 with monoclonal antibodies (mAbs) offers a novel therapeutic strategy.
• Combining targeted therapies with surgical techniques like decortication may improve bone regeneration outcomes.

Purpose of the Study:

• To evaluate the osteogenic potential of anti-BMP-2 mAbs combined with decortication.
• To assess the efficacy of anti-BMP-2 mAbs immobilized on a bone scaffold in a rabbit calvaria model.
• To compare the outcomes of decortication versus intact surfaces when using anti-BMP-2 mAbs.

Main Methods:

• Chimeric anti-BMP-2 mAbs and control mAbs were immobilized on anorganic bovine bone mineral with 10% collagen (ABBM-C) scaffolds.
• Scaffolds were placed within titanium domes on rabbit calvaria, with surfaces either decorticated or intact (n=6 per group).
• Histologic and histomorphometric analyses were performed after 3 months to quantify vital bone volume.

Main Results:

• The anti-BMP-2 mAb with decortication group (AMD) showed significantly higher vital bone volume (34.2% ± 7.8%) compared to all other groups.
• AMD group showed significantly higher bone formation than the anti-BMP-2 mAb without decortication group (AM) (22.3% ± 4.1%).
• All groups demonstrated reduced bone formation further from the calvaria, but the AMD group maintained substantial vital bone formation within 3mm.

Conclusions:

• Anti-BMP-2 mAb in combination with decortication demonstrates superior osteogenic efficacy.
• Decortication significantly enhances the osteogenic potential of scaffolds functionalized with anti-BMP-2 mAbs.
• This combined approach holds promise for improving bone regeneration in orthopedic applications.