Surface porous fibre-reinforced composite bulk bone substitute

Area of Science:

• Biomaterials Science
• Orthopedic Surgery
• Tissue Engineering

Background:

• Developing effective bone substitutes is crucial for reconstructing bone defects.
• Polymethylmethacrylate (PMMA) and fibre-reinforced composite (FRC) offer a potential base for artificial bone.
• Bioactive materials can enhance bone integration and regeneration.

Purpose of the Study:

• To evaluate a novel porous surface material with bioactive glass granules (S53P4) on a PMMA/FRC scaffold.
• To assess the porous surface characteristics and in vitro biomechanical properties.
• To test the in vivo efficacy of the implant in a rabbit tibia defect model.

Main Methods:

• Created a 10 mm long bone defect in rabbit tibias.
• Reconstructed defects using PMMA/FRC implants with S53P4 bioactive glass.
• Fixed implants with intramedullary K-wires and evaluated bone growth and integration over 8 weeks.
• Performed in vitro biomechanical testing (bending strength, flexural modulus).

Main Results:

• New bone growth incorporated the implant within 4 weeks, bridging the defect.
• Direct bone-to-implant contact reached 34%, with bioactive glass granules showing the most contact.
• PMMA-only controls exhibited significantly lower osteoconductive properties.
• In vitro biomechanical tests showed PMMA/FRC properties comparable to human bone.

Conclusions:

• The PMMA/FRC artificial bone material with a bioactive glass surface demonstrates excellent osteoconductivity and integration.
• The material possesses biomechanical properties suitable for load-bearing bone reconstruction.
• This novel bone substitute shows promise for clinical applications in orthopedic surgery.