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Fabrication of Mechanically Tunable and Bioactive Metal Scaffolds for Biomedical Applications

Fabrication of Mechanically Tunable and Bioactive Metal Scaffolds for Biomedical Applications

Published on: December 8, 2015

Bioactive polymer grafting onto titanium alloy surfaces.

A Michiardi¹, G Hélary, P-C T Nguyen

¹Institute of Bioengineering of Catalonia (IBEC), Barcelona, Spain.

Acta Biomaterialia

|September 8, 2009

Summary

Bioactive polymers were grafted onto titanium alloy surfaces to improve biocompatibility. Styrene sodium sulfonate (NaSS) enhanced cell adhesion, while methylacrylic acid (MA)-NaSS polymers showed reduced bone formation in vivo.

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Area of Science:

Biomaterials Science
Surface Chemistry
Polymer Science

Background:

Titanium alloys are widely used in orthopedic implants due to their mechanical properties.
Enhancing the biocompatibility and osseointegration of titanium surfaces is crucial for improving implant success rates.
Grafting bioactive polymers offers a promising strategy to modify surface properties and promote cellular interactions.

Purpose of the Study:

To graft sulfonate and carboxylate-containing polymers onto Ti6Al4V alloy surfaces.
To characterize the grafted polymer layers using advanced surface analysis techniques.
To evaluate the in vitro cellular response and in vivo bone integration of the modified titanium surfaces.

Main Methods:

Two-step surface modification: chemical oxidation followed by radical polymerization of styrene sodium sulfonate (NaSS) and methylacrylic acid (MA).

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Surface characterization using X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS).

In vitro cell culture with human osteoblast-like cells and in vivo implantation in rabbit femora.

Main Results:

Successful grafting of NaSS and MA-NaSS polymers confirmed by XPS and ToF-SIMS, with quantifiable polymer amounts (1-5 µg/cm²).
NaSS-grafted surfaces exhibited significantly higher human osteoblast-like cell adhesion in vitro compared to ungrafted and MA-NaSS surfaces.
In vivo studies showed direct bone contact for all implants, but MA-NaSS grafted implants had a lower percentage of mineralized tissue (47%) compared to NaSS (59%) and non-grafted (57%) implants.

Conclusions:

Surface grafting of bioactive polymers is an effective method to modify Ti6Al4V alloy surfaces.
NaSS grafting enhances early-stage cell adhesion, suggesting improved biocompatibility.
The specific polymer composition (MA-NaSS) may negatively impact long-term bone integration, warranting further investigation into polymer design for orthopedic applications.