Enhanced osteointegration on tantalum-implanted polyetheretherketone surface with bone-like elastic modulus

Area of Science:

• Biomaterials Science
• Surface Engineering
• Orthopedic Research

Background:

• Polyetheretherketone (PEEK) has a bone-like elastic modulus but lacks bioactivity and osteogenesis.
• Poor osseointegration limits PEEK's application in bone implants.

Purpose of the Study:

• To enhance the osteogenic properties of PEEK by surface modification.
• To improve the bio-compatibility and bone integration of PEEK implants.

Main Methods:

• Plasma immersion ion implantation (PIII) of tantalum ions into PEEK to form surface Ta2O5 nanoparticles.
• Nanoindentation for surface elastic modulus measurement.
• In vitro studies using rat bone mesenchymal stem cells (bMSCs) for cell adhesion, proliferation, and osteogenic differentiation.
• In vivo evaluation in a rat femur model using micro-CT, fluorescent labeling, and histology.

Main Results:

• Ta-PIII modified PEEK exhibited an elastic modulus closer to human cortical bone.
• Enhanced bMSCs adhesion, proliferation, and osteogenic differentiation on Ta-PIII PEEK.
• Significantly improved osteointegration in vivo after 8 weeks.

Conclusions:

• Surface modification of PEEK with tantalum ions via PIII synergistically enhances osteogenic differentiation and bone integration.
• Ta-PIII modified PEEK shows significant potential for dental and orthopedic implant applications.