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Equine demineralized bone matrix: relationship between particle size and osteoinduction
T B Vail1, G W Trotter, B E Powers
1Department of Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins 80523.
Veterinary Surgery : VS
|September 1, 1994
Summary
Larger equine demineralized bone matrix (DBM) particles show greater osteoinductive capability in horses. Smaller DBM particles resulted in more inflammation and incomplete demineralization, requiring process adjustments.
Area of Science:
- Biomaterials Science
- Veterinary Orthopedics
- Tissue Engineering
Background:
- Demineralized bone matrix (DBM) is a bone graft substitute with osteoinductive properties.
- The osteoinductive capacity of DBM can be influenced by factors such as particle size and processing.
- Equine DBM has potential applications in veterinary regenerative medicine.
Purpose of the Study:
- To evaluate the osteoinductive capability of four different particle sizes of equine demineralized bone matrix (DBM).
- To assess the inflammatory response associated with different DBM particle sizes in horses.
- To investigate the microscopic events of new bone formation in response to equine DBM implantation.
Main Methods:
- Four particle sizes of equine DBM were implanted into brachiocephalicus muscle pouches in six horses.
- Samples were harvested after 8 weeks for histological evaluation.
- Microscopic analysis focused on new bone production, cellular infiltration, and inflammatory responses.
Main Results:
- Larger DBM particle sizes (2.0-4.0 mm³ and 5.0-10.0 mm³) demonstrated significant osteoinductive activity with minimal inflammation.
- Smaller DBM particle sizes (0.425-0.850 mm³ and 0.850-2.0 mm³) showed limited osteoinductivity and increased local inflammation.
- Histological examination revealed new osteoprogenitor cells, giant cells, cartilage, osteoid, and new bone in larger particle sizes, while smaller sizes had more fibrous tissue and inflammatory cells.
- Incomplete demineralization was noted in smaller particle sizes, impacting osteoinductive potential.
Conclusions:
- Equine demineralized bone matrix is osteoinductive in horses, with particle size significantly affecting its capability.
- Optimal particle size is crucial for maximizing osteoinductivity and minimizing adverse inflammatory reactions.
- The demineralization process for equine DBM may require optimization and rigorous monitoring for complete demineralization before implantation.