Repair of segmental bone defects using bioactive bone cement: comparison with PMMA bone cement

Area of Science:

• Biomaterials Science
• Orthopedic Surgery
• Regenerative Medicine

Background:

• Segmental bone defects pose significant challenges in orthopedic repair.
• Current bone cements like polymethylmethacrylate (PMMA) have limitations in promoting bone integration.
• Development of advanced bone substitutes is crucial for load-bearing applications.

Purpose of the Study:

• To evaluate the efficacy of a novel bioactive bone cement (BABC) for repairing segmental bone defects.
• To compare the performance of BABC against PMMA bone cement under load-bearing conditions.
• To assess the bone-cement interface and mechanical properties of BABC in a preclinical model.

Main Methods:

• A bioactive bone cement (BABC) composed of apatite and wollastonite containing glass ceramic (AW-GC) powder and bisphenol-A-glycidyl dimethacrylate (Bis-GMA) resin was developed.
• A 15-mm segmental defect was created in the rabbit tibia and repaired with either BABC or PMMA bone cement (control).
• Mechanical tension testing was performed at 12 and 25 weeks post-surgery to determine failure loads and assess the bone-cement interface.

Main Results:

• Bioactive bone cement (BABC) exhibited significantly higher failure loads than PMMA cement at both 12 and 25 weeks.
• BABC demonstrated direct contact with bone tissue.
• PMMA cement specimens showed soft tissue ingrowth between the cement and bone.

Conclusions:

• Bioactive bone cement (BABC) is a promising bone substitute for load-bearing applications.
• BABC promotes superior bone integration and mechanical stability compared to PMMA.
• The findings support the clinical potential of BABC in orthopedic defect repair.