A novel composite porous coating approach for bioactive titanium-based orthopedic implants

Area of Science:

• Biomaterials Engineering
• Orthopedic Implants
• Surface Science

Background:

• Surface modification of titanium implants is crucial for improving osseointegration.
• Hydroxyapatite (HA) coatings enhance implant-bone integration.
• Developing advanced coatings is essential for orthopedic applications.

Purpose of the Study:

• To develop and characterize a novel Ti/HA composite porous coating.
• To evaluate the coating's structural, mineralization, and mechanical properties.
• To assess the in vitro biocompatibility of the novel coating.

Main Methods:

• Cold spraying technique for Ti/HA composite coating fabrication.
• Characterization of pore size, macroporosity, and surface morphology.
• Assessment of mineralization in simulated body fluid (SBF).
• In vitro cytotoxicity testing using SaOS-2 cells.
• Measurement of coating-substrate bond strength.

Main Results:

• Achieved an open-cell structure with 50-150 μm pore size and 60-65% macroporosity.
• Exposed HA particles enhanced mineralization ability in SBF.
• No cytotoxic response observed in SaOS-2 cells up to 48 hours.
• Demonstrated a robust bond strength of 20 MPa between the coating and Ti substrate.

Conclusions:

• The novel Ti/HA porous coating exhibits favorable structural and mechanical properties for orthopedic applications.
• Enhanced mineralization and excellent biocompatibility suggest improved osseointegration potential.
• The coating's performance is comparable or superior to existing market products.