Insight into the bioabsorption of Fe-based materials and their current developments in bone applications

Area of Science:

• Biomaterials Science
• Orthopedic Engineering
• Corrosion Science

Background:

• Iron (Fe) and Fe-based materials are increasingly explored for orthopedic applications due to excellent mechanical properties like high yield strength, elastic modulus, and ductility.
• Despite mechanical advantages, concerns regarding corrosion products and slow corrosion kinetics hinder the clinical translation of Fe-based implants.
• Current porous Fe-based scaffolds exhibit enhanced corrosion rates, but in vitro biocompatibility remains a significant challenge, and biodegradation/bioabsorption mechanisms are not well-understood.

Purpose of the Study:

• To provide an in-depth understanding of iron corrosion behavior and bioabsorption mechanisms.
• To review the latest advancements in the corrosion and in vitro biocompatibility of porous Fe-based scaffolds.
• To identify remaining challenges and future perspectives for designing Fe-based orthopedic materials.

Main Methods:

• Review of existing literature on Fe-based materials for orthopedic applications.
• Analysis of corrosion behavior and in vitro biocompatibility studies.
• Investigation into the bioabsorption of Fe-based corrosion products.

Main Results:

• Porous Fe-based scaffolds demonstrate improved corrosion rates but face persistent in vitro biocompatibility issues.
• The biodegradation and bioabsorption pathways of Fe-based implants are not yet clearly elucidated.
• A comprehensive review highlights the critical need for further research into Fe corrosion and bioabsorption.

Conclusions:

• Understanding Fe corrosion and bioabsorption is essential for optimizing Fe-based scaffold design for orthopedic applications.
• Further research is required to overcome biocompatibility challenges and enable clinical trials for Fe-based medical implants.
• This work offers insights into Fe corrosion products and guides future material development for enhanced biocompatibility.