Comparison of bone healing by demineralized bone matrix and autogenous cancellous bone in horses.
Authors: Kawcak C E, Trotter G W, Powers B E, Park R D, Turner A S
Journal: Veterinary surgery : VS
Summary
# Editorial Summary: Demineralized Bone Matrix versus Autogenous Cancellous Bone in Equine Fracture Healing Kawcak and colleagues investigated whether demineralised bone matrix (DBM) could match the healing efficacy of autogenous cancellous bone (ACB) grafts by creating standardised 19-mm defects in the ribs of eight mature horses and comparing three treatment groups—ACB, DBM, and untreated controls—over a 56-day healing period. Despite DBM's theoretical advantages as a readily available allograft material, the study found no significant differences in radiographic or histological healing markers between groups, yet ACB-treated defects demonstrated substantially higher mineral content (ash and calcium) and greater bone volume than DBM sites. The investigators attributed DBM's inferior performance to its unique remodelling pattern: particles measuring 2–4 mm mineralised only from their periphery inwards, effectively acting as space-occupying obstacles rather than active scaffolds for new bone formation. For equine practitioners considering bone graft options in fracture repair, this evidence suggests that smaller DBM particles or alternative particle sizes warrant investigation, as the 2–4 mm fragments evaluated here provided no clinical advantage over untreated defects and may actually compromise mineralisation kinetics compared with traditional autogenous grafting.
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Practical Takeaways
- •2-4 mm demineralized bone matrix particles should not be used as a fracture repair aid in horses, as they interfere with normal bone mineralization
- •Autogenous cancellous bone graft remains superior to demineralized bone matrix for promoting mineral density and calcium incorporation in bone defects
- •Consider alternative particle sizes or preparation methods if pursuing DBM as a bone graft substitute, as the current formulation does not enhance healing outcomes
Key Findings
- •All rib defects treated with demineralized bone matrix (DBM), autogenous cancellous bone (ACB), or control resulted in nonunion fractures at 56 days post-implantation
- •ACB-treated sites had significantly higher percent ash and calcium content compared to DBM-treated sites
- •Control and ACB-treated sites showed increased bone volume compared to DBM-treated sites
- •DBM particles (2-4 mm) appeared to act as space-occupying masses that delayed mineralization rather than enhancing healing