Comparable bone healing capacity of different bone graft matrices in a rabbit segmental defect model

Area of Science:

• Biomaterials Science
• Orthopedic Surgery
• Regenerative Medicine

Background:

• Demineralized bone matrix (DBM) is a common bone graft substitute.
• Optimizing DBM formulations involves varying carrier molecules and bone compositions.
• Understanding the comparative efficacy of different DBMs is crucial for clinical application.

Purpose of the Study:

• To compare the bone healing capacity of three distinct demineralized bone matrix (DBM) products.
• To evaluate the influence of carrier molecules (hyaluronic acid vs. carboxymethylcellulose) and bone compositions (cortical vs. cortical and cancellous bone) on DBM performance.
• To assess bone regeneration in a rabbit segmental defect model.

Main Methods:

• A 15-mm segmental defect model was created in the radiuses of 36 New Zealand White rabbits.
• Defects were filled with three DBM formulations: HA-based DBX, CMC-based DB, and CMC-based NDDB.
• Radiographic and histological evaluations were performed at 4, 8, and 12 weeks post-implantation.

Main Results:

• Pre-implantation, DBX exhibited lower radiopacity, bone volume fraction, and bone mineral density compared to DB and NDDB.
• No significant differences in bone healing scores, bone volume fraction, bone mineral density, or residual bone area were observed among the three DBM groups at any time point.
• All tested DBM products facilitated comparable bone regeneration.

Conclusions:

• The tested demineralized bone matrix products, irrespective of carrier molecule or bone composition, exhibit similar bone healing capacities.
• These findings suggest that variations in carrier molecules and bone composition may not significantly impact the overall bone healing efficacy of DBM in this model.
• Further research may explore long-term outcomes and specific biomechanical properties.